Rolls-Royce Archives
| Identifier | Entry | ||
| 05-page001 | Technical note on curing engine magneto rattles using different spring settings and materials. | ||
| View original record | copy of card. Y.430 15.4.11. 900 ENGINE MAGNETO RATTLES. Can be cured by having very slack slipper wheel i.e., 4 springs not adjusted tightly, but this allows crank to vibrate at higher speeds. The… | ||
| 05-page002 | Investigation into a rattle from the crankshaft, its relation to the magneto drive, and the effect of oil pressure. | ||
| View original record | Magneto X430 900 Re Rattle -> Re Magneto rattle (?) 21.7.11 Rattle comes from crankshaft - made worse by use of loose springs in spring drive - not affected materially by adjustment of tappet wheel.… | ||
| 05-page003 | Alteration of the magneto wire arrangement to allow easier access to the valve cap. | ||
| View original record | Let REF. 40 (11) 27th Sept. 1911. Mr. Swetnam 27-9-11 Will you please alter the present arrangement of Magneto Wires so that it is possible to use the present valve cap spanner in taking out a valve… | ||
| 05-page004 | Report or index card concerning magneto advance. | ||
| View original record | Section. X430 900 DESCRIPTION:- Magneto advance. Date sheet from office. Date received. Date Works instructed. Material received. Reported S.B. office. 24.10.11 Reported to office. Date | Misc. |… | ||
| 05-page005 | Tests and problems with Bosch magnetos, detailing ignition advance. | ||
| View original record | H.R. 140 20.6.11 W 400 8.8.11 G 3723 2A / 2.8.11 Report. Bosch with rollers as tested on 1769, 1767, 1010, advance 2 25° on the fly back. Bosch magnetos with fibre pad on problems 23° advance on… | ||
| 05-page006 | Meeting minutes discussing the Magneto Advance Lever and the arrangement of the Magneto Drive Pinion. | ||
| View original record | X430 74th Meeting. Nov. 14. 11 Re Magneto Advance Lever E.1670. The Committee were informed that Mr. Swetnam was giving the matter his attention. Re Arrangement of Magneto Drive Pinion (Marine Engine)… | ||
| 05-page007 | Meeting minutes from November and December 1911 regarding modifications and arrangements for magnetos on marine engines. | ||
| View original record | X.430 (5) MAGNETOS (Contd. 89th Meeting. Nov. 29th 11. Re E.2139 Magneto Pinion - Withdrawing nut for Marine Engine. The Committee were informed that Mr. Swetnam had not yet been able to give the… | ||
| 05-page008 | Meeting minutes discussing the design and arrangement of a magneto drive pinion for a marine engine. | ||
| View original record | 7430 81st. Meeting. Nov. 22nd.11. Arrangement for Magneto Drive Pinion for Marine Engine. Mr. Swetnam promised that these details would be issued about November 23rd. 82nd. Meeting. Nov. 22nd. 11. Re… | ||
| 05-page009 | Minutes of a meeting discussing a magneto brake lever for a worm drive. | ||
| View original record | R.R. D844 (1000-7-11) A.D. & S. 104-39 (G.271) X.430. (3rd. Meeting. 5. Dec. 11. Magnetos. (Contd. (6) Re Magneto brake for worm drive. Mr. Swetnam submitted a scheme showing a special shortened brake… | ||
| 05-page010 | Minutes from meetings discussing magneto drive pinion arrangement and a broken magneto drive on chassis 1130. | ||
| View original record | 97th Meeting Dec. 11. 11. Arrangement of Magneto Drive Pinion for Marine Engine. Mr. Wormald informed the Committee that he had these parts in hand. 98th Meeting Dec. 13. 11. Re Broken Magneto drive… | ||
| 05-page011 | Meeting notes discussing the cause and potential solutions for a magneto rattle at low speeds. | ||
| View original record | MAGNETOS (Contd.) (9) 99th Meeting Dec. 14. 11. Re Magneto rattles at slow speeds. Mr. Platford had that morning demonstrated to the Committee a magneto rattle which he was troubled with at low… | ||
| 05-page012 | Magneto distributor and gear arrangements. | ||
| View original record | MAGNETOS (Contd.) (10) Y430 "Sheffield Simplex" had removed the distributor from the magneto, and had fitted same to the front of the camshaft. This was to some extent, a reasonable arrangement,… | ||
| 05-page013 | Meeting notes discussing an alternative gear design for magnetos and a magneto drive pinion for a marine engine. | ||
| View original record | MAGNETOS (CONTD.) (10) Messrs. Bailey and Barrington suggested as an alternative that only one pair of gears should be used, but one of these wheels should be formed from two wheels mounted side by… | ||
| 05-page014 | Committee meeting minutes discussing magneto component failures, investigations, and resolutions. | ||
| View original record | MAGNETOS (Contd.) (11) Magneto and Distributor controlling rod and. Mr. Barrington informed the Committee that this part would be made standard at chassis No.1868. 101st Meeting Concerning broken… | ||
| 05-page015 | Committee discussion on two proposed schemes to eliminate magneto gear rattles. | ||
| View original record | MAGNETOS (Contd.) (12) Mr. Swetnam submitted two schemes for overcoming these gear rattles. The Committee discussed the first scheme suggested by them for a split gear wheel connected by springs, and… | ||
| 05-page016 | Minutes from the 99th T.C. meeting regarding magneto rattles at low speeds. | ||
| View original record | Ref. 99(iv) X430 Copy of minute 4 of the 99th meeting of the T.C. TEBS/L201211. Mr Swetnam 20/12/11 Re Magneto Rattles at low speeds. Mr Platford had that morning demonstrated to the Committee, a… | ||
| 05-page017 | Meeting notes discussing modifications to the distributor gearing, mentioning Sheffield Simplex and Bosch. | ||
| View original record | (2) "Sheffield Simplex" had removed the distributor from the magneto, and had fitted same to the front of the camshaft. This was to some extent a reasonable arrangement, in as much that great care was… | ||
| 05-page018 | Meeting minutes discussing a spring-connected gear design and relations with the Bosch Co. | ||
| View original record | (3) wheels should be formed from two wheels mounted side by side and both meshing with the other gear. One of this pair of wheels would be fixed to its shaft, and the other mounted by a spring… | ||
| 05-page019 | Meeting minutes discussing issues with magneto rattles and the design of a spring-controlled gear wheel. | ||
| View original record | 104 Meeting Dec. 27. 11. Re Magneto rattles. Mr. Platford was of the opinion that the question of overcoming magneto rattles was very urgent, and he wished the Committee to urge any experiments we had… | ||
| 05-page020 | The unsatisfactory performance of a CAV Type Magneto due to noisy gears. | ||
| View original record | Mr Hadin. X856. X430 900. RE CAV TYPE MAGNETO. We have finished with this, and regret we have not found same satisfactory, the gears still being noisy. The above is no improvement on our present type… | ||
| 05-page021 | Excessive wear on the rear magneto universal joint due to dirt ingress, proposing a cover as a solution. | ||
| View original record | ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. TELEGRAMS: "ROYCAR," DERBY. TELEPHONES: 813 (Two Lines). DEPARTMENTAL MEMO. This column is for Name of Person addressed. Mr Barrington. Date. 15.7.12… | ||
| 05-page022 | Departmental memo discussing excessive slack and rattles in the keywayed telescopic joint of a new magneto drive. | ||
| View original record | ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. TELEGRAMS: "ROYCAR," DERBY. TELEPHONES: 813 (Two Lines). DEPARTMENTAL MEMO. This column is for Name of Person addressed. Mr Barrington. Date. 16.7.12… | ||
| 05-page023 | Departmental memo regarding insufficient clearance between a universal joint and exhaust down pipes. | ||
| View original record | R.R.'ery 1000 Bk.CL.396. 3.3.20. E.P. 1780. ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. TELEGRAMS: "ROYCAR," DERBY. TELEPHONES: 813 (Two Lines) DEPARTMENTAL MEMO. This column is for Name of Person… | ||
| 05-page024 | Trouble with the magneto universal joint and a request to devise a protective cover. | ||
| View original record | Re Magneto Universal Joint. X429 TEB7/L28712. Mr Elliott 25.7.12. Mr Platford reports that the rear universal joint on the magneto drive shaft gives some amount of trouble as regards wearing slack.… | ||
| 05-page025 | Departmental memo requesting magneto timing settings for a standard engine to compare with a marine engine. | ||
| View original record | ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. TELEGRAMS: "ROYCAR," DERBY. TELEPHONES. 613 (TWO LINES). DEPARTMENTAL MEMO. This column is for Name of Person addressed. Mr Platford DATE. 29.7.12. X430… | ||
| 05-page026 | To Mr. Royce regarding the standard practice for setting the magneto. | ||
| View original record | Magneto Expert Re Setting of Magneto. TBB2/L13813. Mr Royce. 13.8.13. With reference to your enquiry concerning the setting of our standard magneto, I understand from Mr Platford that our standard… | ||
| 05-page027 | Departmental memo discussing issues with fibre bushes in road springs and magnetos, particularly in India. | ||
| View original record | COPY. ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. TELEGRAMS:- "ROYCAR," DERBY. TELEPHONES:- 476 (Four Lines). DEPARTMENTAL MEMO. This column is for Name of Person addressed. Mr Royce For C.L. when… | ||
| 05-page028 | Standing orders for repair shops and the proposal to contact Bosch Co. regarding magneto trouble. | ||
| View original record | ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. TELEGRAMS: "ROYCAR," DERBY. TELEPHONES: 476 (FOUR LINES). DEPARTMENTAL MEMO. This column is for Name of Person addressed. DATE. -2- last instructions by… | ||
| 05-page029 | Query regarding a sticking issue with the make and break mechanism in magnetos, potentially caused by the use of fibre. | ||
| View original record | Magnetos. (Re use of fibre in connection with the make and break) TBB3/L2912. Mr Platford 2.9.12. Kirby reports from the Bombay depot that when fibre is used in connection with the make and break of… | ||
| 05-page030 | Departmental memo regarding the dispatch of parts for chassis number 1737. | ||
| View original record | ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. TELEGRAMS:- "ROYCAR," DERBY. TELEPHONES: 813 (Two Lines) DEPARTMENTAL MEMO. X430 This column is for Name of Person addressed. DATE. Re Chassis No. 1737 -… | ||
| 05-page031 | Departmental memo discussing the use and performance of fibre bushes in magnetos, particularly regarding clearance issues. | ||
| View original record | R.R. form 588 (Reptn. 10,000 B.P. 1/12). ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. TELEGRAMS: "ROYCAR," DERBY. TELEPHONES: 613 (Two Lines). DEPARTMENTAL MEMO. This column is for Name of Person… | ||
| 05-page032 | Guide explaining the workings of a magneto. | ||
| View original record | Useful Hints and Tips Overcoming Suggestions RC 100 How the Magneto works [Illegible body text] [Signature flourish] | ||
| 05-page033 | Article from 'The AUTOCAR' explaining the workings of a magneto for beginners, presented as a dialogue. | ||
| View original record | THE AUTOCAR, November 2nd, 1912. How the Magneto Works. A Colloquial Explanation for Beginners. By Eric W. Walford. HELLO, Jones, I hear you have gone in for a car after all. Yes. I have had a car a… | ||
| 05-page034 | Article from 'THE AUTOCAR' magazine explaining the workings of a magneto with diagrams. | ||
| View original record | THE AUTOCAR, November 2nd, 1912. 791 How the Magneto Works. must be taken not to drop it, otherwise the shock may demagnetise the magnets. "The magnets are not likely to fail on the road?" "No. That… | ||
| 05-page035 | Technical article explaining the function, maintenance, firing order, and timing of a magneto. | ||
| View original record | 790 THE AUTOCAR, November 2nd, 1912. How the Magneto Works. The ball bearings require lubrication about once every thousand miles with a few drops of oil put into the oil holes you see on the front… | ||
| 05-page036 | Illustrated article from a magazine detailing the components and workings of a magneto's contact breaker. | ||
| View original record | THE AUTOCAR, November 2nd, 1912. so this in the case of the Simms and the Bosch mag-netos you first move sideways the spring blade which holds the contact breaker cover in place. The cover can now be… | ||
| 05-page037 | Guide on the maintenance, troubleshooting, and adjustment of a magneto's contact breaker. | ||
| View original record | THE MOTOR, February 20th, 1912. How the Magneto Works. right position is repairs to the armature. This also applies if you have removed the contact breaker to clean it, or for any other reason.” “How… | ||
| 05-page038 | Magazine article explaining the function and adjustment of a magneto's contact breaker. | ||
| View original record | THE AUTOCAR, November 2nd, 1912. 793 How the Magneto Works. rule it is fitted to the special knives which the magneto makers supply. These knives are very hard. They are fitted with a good blade, a… | ||
| 05-page039 | Newspaper clipping from 'The Autocar' discussing magneto operation and the 8 HP Globe Runabout vehicle. | ||
| View original record | 796 THE AUTOCAR, November 2nd, 1912. How the Magneto Works. "That explains why I have to start the engine with the ignition either fully or almost fully advanced, but can retard it slightly when the… | ||
| 05-page040 | Article explaining the workings of a magneto for beginners. | ||
| View original record | THE AUTOCAR. November 9th, 1912 DC 1190 925 How the Magneto Works. A Colloquial Explanation for Beginners. By Eric W. Walford. (Concluded from page 795.) " Now we come to the distributer, which… | ||
| 05-page041 | Article from 'The Autocar' magazine explaining the operation of magnetos, with illustrations of Simms, Eisemann, and Bosch models. | ||
| View original record | THE AUTOCAR, November 9th, 1912. How the Magneto Works. 'hands out' the current from the central disc (brought thereto by the conductor) to the four brass segments in turn. One of these segments is… | ||
| 05-page042 | Diagrams illustrating the four firing positions of a four-cylinder magneto. | ||
| View original record | THE AUTOCAR, November 9th, 1912. 927 TERMINALS REVOLVING BRUSH HOLDER VULCANITE BASE BRASS SEGMENT ROCKER Fig. 18.—Magneto with distributor and contact breaker covers removed. One brass distributor… | ||
| 05-page043 | Article explaining the operation of a magneto, including fault-finding and procedures for removal and re-fitting. | ||
| View original record | 628 THE AUTOCAR, November 9th, 1912. How the Magneto Works. current passes from this armature along the central screw, through the brush and spring bow on the contact breaker cover, and so along the… | ||
| 05-page044 | Article from 'The Autocar' magazine explaining how to time and set up magnetos for an engine. | ||
| View original record | THE AUTOCAR, November 9th, 1912. How the Magneto Works. "That is all right supposing there is a coupling on the armature-shaft, but I believe my magneto is fitted with a gear wheel on the… | ||
| 05-page045 | Article from 'The Autocar' magazine discussing the maintenance, troubleshooting, and testing of a magneto. | ||
| View original record | 930 THE AUTOCAR, November 9th, 1912. How the Magneto Works. slightly in the direction opposite to that of the arrow." "You have told me a lot about the magneto, but what I am not clear about is what… | ||
| 05-page046 | Article by A.E. Bennett discussing the development and performance of magneto ignition systems, with diagrams and test results. | ||
| View original record | FEBRUARY 21, 1914 MAGNETO IGNITION.* By A. E. BENNETT. AFTER the author had traced the development of the magneto from its earliest form, and had demonstrated the superiority of this form of ignition… | ||
| 05-page047 | Experiment with a contact breaker arm fitted with a fibre bush and fibre rollers. | ||
| View original record | Wor/Sill/115814. August 15th.1914. J. H. M. TUG. X 430 Report on Contact Breaker Arm fitted with fibre bush & fibre rollers. This experiment was put through because of complaints that this part seldom… | ||
| 05-page048 | Failure of fibre bushes in Bosch magneto contact breakers during a 10,000-mile engine bench test. | ||
| View original record | Wor/EHS/027814. Re Fibre Bushes for Contact Breakers. X 420 J. 27-8-14. R. In reply to Mr Royce's note E1/E19814 I should like to point out that on the 10,000 mile engine bench test, two Bosch magneto… | ||
| 05-page049 | Challenges and methods for creating sufficiently strong permanent magnets for magnetos. | ||
| View original record | C O P Y. COPY To Na. from R. Copy to J. Copy to Wor. 21st September 1914. R1/B21914. Re Magnetos. With reference to magnetos, I understand your difficulty is getting the permanent magnetos… | ||
| 05-page050 | Methods for magnetizing and testing magnets, with specific reference to experiments on Bosch magnets. | ||
| View original record | R1/B21914. No.2 COPY powerful electro magnet and place alternately on one and the other pole the yoke of the magnet and draw it along to the point, when it has been forcibly pulled off the electro… | ||
| 05-page051 | The properties and hardening of steel for magnetos, with a comparison to Bosch magnets. | ||
| View original record | C O P Y. To Na. from H. Copy to J. Copy to Wor. R6/IB21114. November 2nd. 1914. Re Magnetos. I was exceedingly interested in the description of the work done with reference to permanent magnets for… | ||
| 05-page052 | Achieving magnet permanency and comparing steel composition and hardness against a Bosch equivalent. | ||
| View original record | To Na. from R. 2. R6/IB21114. greatest permanency would undoubtedly require the larger current in the coils, but care should be taken that the time was equal and the conditions also, that is, avoid… | ||
| 05-page053 | Returning a loaned book on the High-Tension Magneto and requesting a copy be obtained. | ||
| View original record | To F.H. from E. RE HIGH TENSION MAGNETO BOOK. We attach herewith Young's book on the High-Tension Magneto, belonging to yourself, for the loan of which we thank you very much. We should be glad if you… | ||
| 05-page054 | Design changes to the front flywheels, magneto, and air pump. | ||
| View original record | R.R. 23a. (500 T.) (N.D.) (No. 23-4-13.) Dec. 23/1613 BY. DA. & EN. from R. -6- H7/G181218. Contd. (7) FRONT FLYWHEELS. X-3429 The absence of balance weights, the lighter crankshaft, lighter… | ||
| 05-page055 | Requesting views on a cumbersome and seemingly impractical inductor scheme for magnetos. | ||
| View original record | To E.F.C. From Bn. Bn4/P8.5.19. X 430. Magnetos General Please let me have your views shortly on the attached. The basic difference between this and other inductor schemes seems to necessitate a very… | ||
| 05-page056 | Critique of a sleeve inductor type magneto design (Paynes Patent), comparing it to polar inductor types. | ||
| View original record | To En. From EFC. EFC2/T9.5.19. X.480. Magnetos General. (Paynes Patent) Regarding the attached, we do not think very much of the idea. The magneto is, in principle, very much the same as the sleeve… | ||
| 05-page057 | Continuation page of a specification document. | ||
| View original record | Contd. -2- EFC2/T9.5.19. more satisfactory than one of the type illustrated in this specification. EFC. | ||
| 05-page058 | Letter from Splitdorf Electrical Co. following up on magnetos and distributors sent for testing. | ||
| View original record | DIRECT BRITISH AND EUROPEAN REPRESENTATIVES FOR SPLITDORF ELECTRICAL Co. Newark N.J. U.S.A. SPLITDORF ELECTRICAL CO. 162, GREAT PORTLAND STREET, LONDON, W.1. Telephone MAYFAIR 3253 Cable Address… | ||
| 05-page059 | List of various magnetos from different manufacturers awaiting testing. | ||
| View original record | X.430. 27.4.20. X.430. MAGNETOS AWAITING TEST. -------------------------------- 1. Eisemann. G.N.6. X.179. 1. Watford. B.6. fitted with X.2375.) tungsten points. X.2894.) 2. Bosch. Z.R.6. X.3916. 2. "… | ||
| 05-page060 | Letter from The British Thomson-Houston Co. Ltd discussing magneto flux curves and voltage waves. | ||
| View original record | X 430 THE BRITISH THOMSON-HOUSTON CO.LTD LOWER FORD STREET, COVENTRY. May 20th 1920. Mr. H.I.F.Evernden, B.Sc., Expl. Drawing Office, Messrs. Rolls-Royce Ltd., Derby. Dear Sir, RE MAGNETO FLUX CURVES.… | ||
| 05-page061 | The concluding page of a letter from the Chief of the Engineering Department regarding achieving results at high speeds. | ||
| View original record | -2- Contd. they must remain open for a considerable period before the next closure, if the best results are to be achieved at very high speeds. Yours faithfully, (sgd) A.P. Young, CHIEF - ENGINEERING… | ||
| 05-page062 | Preliminary report on the American Bosch Magneto ZR 6, comparing it to the German version. | ||
| View original record | X 430 R.R.B'ham.100 T/P.O.Dat.24-5-20 C.H.W To R. from Hs. c. to CJ. c. to Bn. c. to Cy. c. to Na. c. to E. c. to Da. c. to Ey. Hs5/LG20.7.20. X.3916. PRELIMINARY REPORT ON AMERICAN BOSCH MAGNETO ZR… | ||
| 05-page063 | Comparison of American ZR 6, German Bosch, and Watford magnetos regarding construction, noise, and reliability. | ||
| View original record | Contd. -2- Hs5/LG20.7.20. carbon brush on the high tension distributor. The American ZR 6 magneto is not as well made and finished as the German Bosch but it compares very favourably with the Watford… | ||
| 05-page064 | Comparative test report on Watford and American Bosch magnetos, including bench and road tests. | ||
| View original record | -3- HS5/LG20.7.20. Contd. breaker. It will be seen from the results that the Bosch Magneto gives a slightly better spark than the Watford on the bench. We have, however, carried out comparative tests… | ||
| 05-page065 | Investigation of magnetos, ignition, and sparking plugs. | ||
| View original record | To R. from EPC. c. to CJ. c. to Wor. c. to Rn. EPC9/T24.7.20. X430 X.430. Magnetos. X.699. Ignition. X.1812. Sparking Plugs. We are not really in a position to carry out any serious work on the above… | ||
| 05-page066 | Instruction sheet listing magnetos to be tested and compared against a standard Watford magneto. | ||
| View original record | RR 100 (12050) (SP 249 26-1-19) MCP 304557 X430 91175 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To E.F.C. Order No. P.A.11. Re X. Customer's No. Date: August 23rd 1920 X430 List of Magneto's Available for… | ||
| 05-page067 | Instruction sheet detailing the availability of various magnetos for order P.A.11. | ||
| View original record | R.R. 550 (100M)-DP Jan 24-9-19) P&P 200157 91176 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To E.F.C Order No P.A.11. Customer's No. Re X August 23rd 1920 2 Dixie. Aero. 64S. 1 Berling. Type. E. 61. 1 " " F.… | ||
| 05-page068 | Notes on the action of a revolving armature type magneto. | ||
| View original record | X.430 R R DRG. INST:CS H. 11A. 21-8-20 G. 200 6.10.20. NOTES ON THE ACTION OF A REVOLVING ARMATURE TYPE MAGNETO. First, consider an unwound armature of magnetically ideal material, that is to say,… | ||
| 05-page069 | Two diagrams illustrating the principle of a rotating armature within a magnetic field. | ||
| View original record | R.R. DEA. 1207/TCH/R. 136. 12-8-36. G. -1a- N S FIG 1 + FIG 2 | ||
| 05-page070 | Diagrams illustrating a rotating component within a housing and a typical speed-gap curve graph. | ||
| View original record | P.D. M/M. 108 T/C/A.H. 138. D.9-80. G.149 16 FIG 3 SPEED FIG 4 TYPICAL SPEED - GAP CURVE GAP | ||
| 05-page071 | Page discussing the effects of hysteresis and eddy currents on an armature and pole pieces in a magnetic system. | ||
| View original record | -2- Contd. Secondly, suppose the material of the armature and pole pieces to suffer from hysteresis but no eddy currents. The core flux will still be a maximum when the armature is horizontal, as… | ||
| 05-page072 | Page explaining the effects of eddy-currents and flux changes in an armature core and pole pieces. | ||
| View original record | -3- Contd. change of flux in the armature core and pole piece, for suppose a very small change to take place, E.M.F's will be set up in the various conducting paths, which will cause currents, and… | ||
| 05-page073 | Theoretical analysis of magneto operation, discussing eddy current loss, flux, and primary coil windings. | ||
| View original record | -4- Contd. loss in the armature core and pole pieces of a magneto, either by reducing the resistances of eddy current paths or by increasing the speed, is to reduce the flux in the direction of… | ||
| 05-page074 | Technical analysis of magneto primary current, considering electrical lag, ampere-turns, and eddy currents. | ||
| View original record | -5- Contd. the material. The number of turns makes no difference so long as this product is unaltered. (In a magneto, given the primary winding space, the number of turns will be fixed by… | ||
| 05-page075 | Page explaining armature core flux, current induction, and related electromagnetic principles at varying speeds. | ||
| View original record | V.E. No. DWT-3-B H.124.G:C.W.H -6- Contd. varying speeds. Generally speaking, the point of make in the fully advanced position should occur when, under open circuit conditions, the armature core flux… | ||
| 05-page076 | Page discussing the principles of core flux, electromotive force, and primary current in an ignition system. | ||
| View original record | -7- Contd. would be less, but the core flux has to be maintained with the rapidly decreasing assistance of the permanent magnet, and after a certain point against the E.M.F. of the permanent magnet,… | ||
| 05-page077 | Technical explanation of magneto ignition timing, focusing on current at break and spark intensity. | ||
| View original record | -8- Contd. break will be so arranged that, for the fully advanced position the primary current is arrested before it reaches its peak value, and that, for the fully retarded position it is arrested… | ||
| 05-page078 | Technical explanation of magneto operation regarding current, E.M.F., and spark intensity at different speeds and timings. | ||
| View original record | -9- Contd. progressively by advancing the contact breaker. On the other hand, if the speed of the magneto be considerably increased, say to 3000 r.p.m. the peak of current in both cases advance and… | ||
| 05-page079 | Continued explanation of primary current behaviour in relation to speed, magnetic flux, and eddy currents in an armature core. | ||
| View original record | -10- Contd. revolves. In general, the primary current at the instant of break for moderate speeds will be greater the greater the speed. It will be readily seen, however, that the maximum possible… | ||
| 05-page080 | Explanation of the electrical phenomena occurring in a circuit immediately after the point of break. | ||
| View original record | -11- Contd. Sixthly. We now have to consider the phenomena which occur immediately after the point of break and during the interval succeeding this point up to the next point of make. In what has gone… | ||
| 05-page081 | Explanation of discharge and flux redistribution in primary and secondary circuits following an interruption of current. | ||
| View original record | -12- Contd. discharge taking place. This state of affairs just outlined would, however, be impossible practically as a voltage corresponding to the transient voltage in the secondary, but smaller in… | ||
| 05-page082 | The use of a condenser to manage inductive discharge in primary and secondary windings. | ||
| View original record | -13- Contd. current is almost entirely of the nature of an arc or inductive discharge. The factors which would render this not exactly of this nature, would be the distributed capacities of the… | ||
| 05-page083 | Explanation of oscillatory current within a magneto's primary circuit, including the function of the condenser and safety gap. | ||
| View original record | -14- Contd. condenser connected across the primary points. Such an oscillatory current, damped by the effect of primary resistance, therefore takes place. The frequency of this oscillatory current can… | ||
| 05-page084 | Page describing the electrical phenomena of current oscillation in primary and secondary circuits. | ||
| View original record | -15- Contd. current will overshoot the zero and become negative, and current oscillations will proceed for a while as already explained. The fall of current referred to takes place coincidently with a… | ||
| 05-page085 | Explanation of primary and secondary oscillations within a high-frequency air core transformer and magneto ignition systems. | ||
| View original record | A.M. SECTION No. 11A, Issue 1. AUG 1920 -16- Contd. of the primary oscillation, so that at every instant while these two oscillations last they annihilate one another in their effect on the armature… | ||
| 05-page086 | Page describing the electrical behavior of primary and secondary currents and flux redistribution in an armature core. | ||
| View original record | -17- Contd. armature core due to current in the windings, takes, at this instant, the place of that primary current. The primary current itself has, as already stated, become zero after a few quick… | ||
| 05-page087 | The characteristics and effects of the initial spark versus the arc discharge in an ignition system. | ||
| View original record | -18- Contd. of the initial oscillatory spark is small, but the arc discharge is of relatively great volume. Conversely if the high tension gap is only just broken down it means that practically all… | ||
| 05-page088 | The arc effect in magnetos at high speeds, its issues, and potential remedies. | ||
| View original record | -19- Contd. The arc effect might be reduced, other things remaining the same by reducing the main flux of the magneto by removing one of the permanent magnets. It would probably be found under running… | ||
| 05-page089 | Page discussing methods to alter spark effects by manipulating magnetic flux and secondary turns in an ignition system. | ||
| View original record | -20- Contd. improved by reducing the main magnetic flux. A third method would be to reduce the number of secondary turns. Each of these ways would decrease the proportion of arc effect to initial… | ||
| 05-page090 | List of weights for different magnetos available for testing. | ||
| View original record | EFC. P.A.33. X.430 91230. Oct. 21st. 1920. X.430. WEIGHTS OF MAGNETOS AVAILABLE FOR TEST. X.2375. The following weights are of the complete machine without a pulley :- X. No. No. of magnetos Lbs.… | ||
| 05-page091 | List of magnetos fitted to various experimental cars. | ||
| View original record | R.R.B. 24A. 200/T-C.S.24.120. 12-9-19(R)-C 1629 X.430 EPE. 22.10.20. F.C.100 X.430. MAGNETOS ON EXPL. CARS. X. 2375. X.3910 (crossed out) 7 CA Watford E.S. 49-GB. * E.O.6. 1 EX * E.O.6 2 EX * E.6 3 EX… | ||
| 05-page092 | The delayed testing and preliminary inspection of magnetos supplied from America. | ||
| View original record | X430 To ENT. from EPC. RFC5/T9.11.20. X. 430. - RE MAGNETOS SUPPLIED FROM AMERICA. X. 3702. ------------------------------------------- We have not been able until quite recently, owing to lack of… | ||
| 05-page093 | Standard for defining the direction of rotation for electrical machines to avoid ambiguity. | ||
| View original record | X430 10.11.20 ROTATION OF ELECTRICAL MACHINES. In order to avoid ambiguity we will always speak of rotations in the following manner :- A positive rotation is one which is clockwise (right-handed)… | ||
| 05-page094 | Letter from Eyquem Sparking Plugs Ltd. offering G. & A. Magnetos with a trade discount and advertising their magneto repair services. | ||
| View original record | Telephone: Battersea 1313. Telegraphic Address: Akamspak, Battpark, London. (filed 17 11 20) Eyquem Sparking Plugs Ltd. 83, Arch, Queen's Circus, Battersea, London, S.W.8. REGISTERED OFFICE: 30,… | ||
| 05-page095 | Sales leaflet for 'LA FRANÇAISE G.A' high-tension magnetos, including prices and ordering instructions. | ||
| View original record | PAGE 1 (LEFT): To Avoid Delay in Delivery CUSTOMERS ARE REQUESTED To send the following particulars when ordering: a. Type of Magneto required. b. Direction of rotation whether clockwise or… | ||
| 05-page096 | Specification sheet for G.A. high tension waterproof magnetos, detailing features, types, and dimensions. | ||
| View original record | PAGE 1 SPECIAL FEATURES of the G. A. High tension Waterproof Magnetos Design. Silent running. Ease of maintenance. Maximum efficiency. Ease of dismantling & repair. Rotation both ways. All types of G.… | ||
| 05-page097 | Brochure for 'La Française' waterproof magnetos for 2-cylinder engines, detailing ordering information, prices and conditions of sale. | ||
| View original record | To Avoid Delay in Delivery CUSTOMERS ARE REQUESTED To send the following particulars when ordering : a. Type of Magneto required. b. Direction of rotation whether clockwise or anticlockwise. c.… | ||
| 05-page098 | Specification sheet for G.A. high-tension waterproof magnetos, detailing special features, types, and measurements. | ||
| View original record | SPECIAL FEATURES of the G. A. High tension Waterproof Magnetos Design. Silent running. Ease of maintenance. Maximum efficiency. Ease of dismantling et repair. Rotation both ways. All types of G. A.… | ||
| 05-page099 | Product brochure for 'La Française' waterproof magnetos, detailing types, prices, and ordering information. | ||
| View original record | LEFT PAGE: To Avoid Delay in Delivery CUSTOMERS ARE REQUESTED To send the following particulars when ordering : a. Type of Magneto required. b. Direction of rotation whether clockwise or… | ||
| 05-page100 | Specification sheet detailing the features and dimensions of G.A. high-tension waterproof magnetos. | ||
| View original record | SPECIAL FEATURES of the G. A. High tension Waterproof Magnetos Design. Silent running. Ease of maintenance. Maximum efficiency. Ease of dismantling & repair. Rotation both ways. All types of G. A.… | ||
| 05-page101 | Brochure for 'La Française' G.A. waterproof magnetos, providing ordering instructions, prices, and conditions of sale. | ||
| View original record | --- PAGE 1 --- SOCIÉTÉ ANONYME H. ARQUEMBOURG & JORET Late GROUVELLE & ARQUEMBOURG AGENTS FOR GREAT BRITAIN & COLONIES : B. M. FAIR & Co., 83 Arch, Queen's Circus, Battersea, London, S.W. 8. Telephone… | ||
| 05-page102 | Technical brochure for G. A. high-tension waterproof magnetos, detailing features and specifications for types D1 and D2. | ||
| View original record | SPECIAL FEATURES of the G. A. High tension Waterproof Magnetos Design. Silent running. Ease of maintenance. Maximum efficiency. Ease of dismantling & repair. Rotation both ways. All types of G. A.… | ||
| 05-page103 | Sales brochure for 'La Française' oscillating magnetos from H. Arqmbourg & Joret. | ||
| View original record | To Avoid Delay in Delivery CUSTOMERS ARE REQUESTED To send the following particulars when ordering : a. Type of Magneto required. b. Direction of Rotation as shown on illustration. Strike for… | ||
| 05-page104 | Technical brochure detailing the features, types, and measurements of G.A. high-tension waterproof magnetos. | ||
| View original record | SPECIAL FEATURES of the G. A. High tension Waterproof Magnetos Design. Silent running. Ease of maintenance. Maximum efficiency. Ease of dismantling & repair. Rotation both ways. N. B. — The attention… | ||
| 05-page105 | The procedure for the comparison and testing of experimental magnetos. | ||
| View original record | X.430 X.430. COMPARISON OF EXPERIMENTAL MAGNETOS. (1) The weight of the magneto complete but without pulley, shall be taken. (2) Some general remarks with regard to mechanical and electrical details… | ||
| 05-page106 | Procedure outlining a series of electrical and endurance tests for a magneto. | ||
| View original record | -2- Contd. (8) The open circuit wolt-speed curve of the primary winding shall now be obtained, making use of a suitable A.C. instrument. (9) The closed circuit primary ampere-speed curve shall now be… | ||
| 05-page107 | Test procedure for a magneto's spark-producing capability under adverse conditions using Remy coils. | ||
| View original record | 2a- Contd. (12a) The magneto shall now be subjected to utility tests, i.e. tests to find out its capability of producing a spark under adverse, e.g. leaky, sparking plug, conditions. For this purpose… | ||
| 05-page108 | Test specification outlining procedures for evaluating magneto sparking performance. | ||
| View original record | -3- Contd. and the slowest speeds at which regular sparking will occur for:- (a) Fully advanced position (b) Central position and (c) Fully retarded position, shall be ascertained. Note:- The minimum… | ||
| 05-page109 | Continued list of testing procedures for an electrical component, including resistance, current, and flux measurements. | ||
| View original record | -4- Contd. (18) The resistance of the secondary cold (state temperature) winding shall be obtained by passing through this winding a few milli-amperes of current from a battery of 12 volts or… | ||
| 05-page110 | Quotation from B. M. Fair & Co. for magnetos for a 40/50 HP 6 Cylinder Engine. | ||
| View original record | B. M. FAIR & CO. TELEPHONE: BATTERSEA 1313. TELEGRAPHIC ADDRESS: AXAMEDAB, BATTPARK, LONDON. PARTNERS: BERNARD MATTO. FORMERLY: BERNARD MATTO. NATIONALITY: BRITISH (1903). NATIONALITY OF ORIGIN:… | ||
| 05-page111 | Cover letter forwarding information about a 'La Francaia' G.A. magneto. | ||
| View original record | EFO. from Wt. X430. W13/AJ/22.11.20. X430. Magneto "La Francaia" G.A. Herewith I send you a letter from B.M. Fair & Co., 83, Arch, Queen's Circus, Prince of Wales Road, Battersea, S.W.8, dated 19th… | ||
| 05-page112 | Sales letter from The Salmson Magneto Company regarding their magnetos. | ||
| View original record | Telegrams: WINNOW CANNON LONDON Telephone: CENTRAL 2660. THE SALMSON MAGNETO COMPANY. E. KIMMINS SOLE CONCESSIONAIRES FOR SALMSON MOTOR CAR MAGNETOS. As supplied to H.M. GOVERNMENT. FRENCH GOVERNMENT.… | ||
| 05-page113 | Sales letter from The Salmson Magneto Company regarding their motor car magnetos. | ||
| View original record | Telegrams: WILCANON, LONDON. Telephone: CENTRAL, 2860. X 430 THE SALMSON MAGNETO COMPANY. E.P. KIMMINS SOLE CONCESSIONAIRES FOR SALMSON MOTOR CAR MAGNETOS. As supplied to H.M. GOVERNMENT FRENCH… | ||
| 05-page114 | Instructions for a utility test of a spark-coil or magneto. | ||
| View original record | EP 166 (1260) (ST) 24.5.19. MP (8015) X.430 88252 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: EFE Order No: 25 Customer's No.: 1 Re: X.3199 Utility Test of Spark-coil or Magneto X.430 In place of high… | ||
| 05-page115 | Instructions for a utility test experimenting with creating a non-inductive resistance. | ||
| View original record | R.R.Form (1358) (SF 349 26-1-39) P&P 2305/12 ROLLS-ROYCE LIMITED. INSTRUCTIONS. 88248 19 To Order No. Customer's No. 2 (cont'd) Re Utility Test. With primary short-circuited. wire-gap = '06". In order… | ||
| 05-page116 | Instructions for a utility test on electrical coils, detailing series connections and measurements. | ||
| View original record | R.F. 10B (1205) (SP 589 2M. 6-19.) [MP 20015] 88249 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To Order No. Customer's No. ? Re Utility Test (Cont'd) 2 in series in the same way as the RR standard coil, so… | ||
| 05-page117 | Instructions and results for a utility test on Magneto X.3199. | ||
| View original record | RB.1600 (C259) (SP 349 24-5-19) M/P 200/12 88255 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To E.F.C. Order No. 28 Customer's No. 1 Re X.T.T. 430 10-XII-1920 Utility Test of Magneto X.3199 A Watford E6… | ||
| 05-page118 | Instruction sheet detailing a utility test on magnetos, noting the effect of safety gap size. | ||
| View original record | R.P.960 (1268) [SF 349 24-5-19] PSP 200552 88256 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To Order No. Condenser No. 2 Re Utility Test of Magnetos (Condd) doubtless do much better if the safety gap were… | ||
| 05-page119 | Instructions for a utility test on a standard ignition coil with leakage resistance. | ||
| View original record | R.R.H.M. 1128(S) (SF 269 24.1.19.) PDP 2097/12 88258 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: EFC Order No: 20 Customer's No: 1 Re: X3199 15 - III - 1920 Utility Test of Spark - coil (A further utility… | ||
| 05-page120 | Ability test of a spark-coil, comparing its performance against a Watford E6 magneto under various conditions. | ||
| View original record | ROLLS-ROYCE LIMITED. INSTRUCTIONS. 88259 19 To Order No Customer's No. 2 (contd) Re: Ability Test of Spark-coil the Watford E6 magneto reported 10-XII-20 The ignition coil appears to do better than… | ||
| 05-page121 | Procedure for a 'Utility' test of a spark coil on a magneto. | ||
| View original record | X.430 To S. From KPC. c. to CJ. c. to E. c. to PN. c. to HY. c. to EP. c. to Da. c. to RMF. for R.R.Inc. X.3180 - "UTILITY" TEST OF SPARK COIL. ON MAGNETO. A.S.B. This was referred to in our report… | ||
| 05-page122 | Report comparing the performance of a Watford E.6 magneto with a standard battery ignition system. | ||
| View original record | Contd. -2- SFC2/17.1.21. (c) As (b) but both primaries are not short circuited. (d) The secondary of one coil only is connected across the gap and its primary short circuited. Thus we have four stages… | ||
| 05-page123 | Comparative test of spark length for magneto and battery ignition systems under different leakage conditions. | ||
| View original record | X.2375. X.3128. COMPARATIVE SPARKING OF PAT GMD K.6 MAGNETO AND R.R. STANDARD BATTERY IGNITION ON UTILITY TEST. | Nature of leakage. | Maximum spark length (mm) for regular firing on one of six gaps… | ||
| 05-page124 | Letter to Claude Johnson regarding electrical apparatus issues on postwar chassis and the resulting high service costs. | ||
| View original record | X430 Mr. Claude Johnson, 15 Conduit Street, London, England. December, 9th 1920. Dear Mr. Johnson, X.41635 X.5402 X1430 Re Matters on which more complete replies are required from England. Attached… | ||
| 05-page125 | Chasing outstanding replies from the Derby factory regarding luggage carriers, spark plugs, and magnetos. | ||
| View original record | X-430 Cyl/GS.12.20. Dec. 8th 1920. To Mr. Belnap. CC Mr. Nadin. Mr. Burton. Mr. Manning. From :- Mr. Olley. X 4165 x 2402 X 430 Re Matters on which more complete replies are required from England.… | ||
| 05-page126 | Comparison of American and Watford magnetos, highlighting the difficulties and resource drain caused by repairing the latter. | ||
| View original record | Contd. -2- Qy/GS.12.20. These magnetos are all extensively used in this country under very arduous conditions in big cars, trucks and tractors, and we believe that at least they would not give less… | ||
| 05-page127 | Extract detailing a schedule of bench tests for various experimental magnetos. | ||
| View original record | X430 To R. from EPC. c. to E. c. to CJ. c. to KP. c. to Ry. c. to Bn. c. to FN. c. to Dn. c. to EWT. for R.R. Inc. Extract from - EPC5/T16.12.20. X.437D. - WATFORD TYPE K.G. MAGNETO. X.419L. - WATFORD… | ||
| 05-page128 | The potential applications of Bakelite in car manufacturing, including steering wheels, gears, and coachwork. | ||
| View original record | X 480 Contd. Abstract from -5- X.1109 recently acquired. X.430. Timing gears. For magnetos of canvas-Bakelite have been used for years. Also timing gears on many engines. They are silent and need no… | ||
| 05-page129 | Review of American-made magnetos being considered for the 40/50 chassis due to issues with the standard model. | ||
| View original record | 4 To R. from EFC. c. to CJ. c. to E. c. to EP. c. to FN. c. to Ds. c. to Ey. c. to EWT. for R.R.Inc. X.430 EFC1/T1.1.21. X.430 - MAGNETOS FOR 40/50 CHASSIS. X SYO2 It appears from accounts received… | ||
| 05-page130 | The standardization and testing of American magnetos for U.S.A. cars compared to those used in Derby. | ||
| View original record | Contd. -2- EPCl/T1.1.21 We assume that the principle still holds that the magnetos on the cars produced in U.S.A. must be identical with those on cars produced at Derby. Hence, the standard-isation of… | ||
| 05-page131 | Magneto models submitted by the Watford, Conner, and B.T.H. companies for consideration. | ||
| View original record | Contd. -3- EFC1/T1.1.21. bench testing work on these machines; secondly, owing to the great pressure of other work in the general Expl. Dept. and the few experimental cars available for such tests.… | ||
| 05-page132 | The comparative merits of Bosch and British (B.T.H.) magnetos for potential standardisation. | ||
| View original record | Contd. -4- EFC1/T1.1.21. Coventry on Wednesday last, during which visit the development of this particular magneto was explained. [crossed out handwritten text] (5) There is also the possibility of… | ||
| 05-page133 | Description of the B.T.H. Type 'MM' Magneto. | ||
| View original record | G.M. 855A (FOR T.D.R.) 1M. 10-12-20 (D.L. 2047) X.430. (Issued 24-1-21) The B.T.H. Co., Ltd. Coventry, England. X.3515 DESCRIPTION. X 430 of the B.T.H. TYPE "MM" MAGNETO. This type of magneto is made… | ||
| 05-page134 | Table of minimum sparking speeds for various post-war Bosch and B.T.H. magneto models. | ||
| View original record | Contd. -2- post-war models of Bosch magnetos and the B.T.H. type "PM" magneto MINIMUM SPARKING SPEEDS. Full Advance. Full Retard. Angle of Adjustment. Bosch "ZU4" 76 RPM 155 RPM 35Q° Bosch "ZR6" 80… | ||
| 05-page135 | Procedure for the comparison and testing of experimental magnetos. | ||
| View original record | X. 430. 28.1.21. X.430. COMPARISON OF EXPERIMENTAL MAGNETOS. (1) The weight of the magneto complete but without pulley, shall be taken. (2) Some general remarks with regard to mechanical and… | ||
| 05-page136 | Page from a magneto test procedure outlining steps for circuit and performance testing. | ||
| View original record | -2- Contd. (8) The open circuit volt-speed curve of the primary winding shall now be obtained, making use of a suitable A.C. instrument. (9) The closed circuit primary ampere-speed curve shall now be… | ||
| 05-page137 | Procedure for conducting utility tests on a magneto under various conditions. | ||
| View original record | -3- Contd. (13) The magneto shall now be subjected to utility tests, i.e. tests to find out its capability of producing a spark under adverse, e.g. leaky, sparking plug conditions. For this purpose… | ||
| 05-page138 | Instructions for testing the sparking characteristics and performance of a magneto. | ||
| View original record | -4- Contd. contact breaker lever advanced until the maximum sparking advance is found. NOTE:- The maximum sparking advance can be taken to be that advance at which 100 sparks, without missing, are… | ||
| 05-page139 | Test procedure for a magneto's high-speed sparking gap. | ||
| View original record | 4a EFC. Feb. 3rd. 1921. P.A.64 X.430 - MAGNETO. - HIGH SPEED SUB-TESTS. (1) Find maximum regular sparking gap for all high speeds (speeds above 1300 R.P.M.) for Advance Central Retard. (2) Adjust gap… | ||
| 05-page140 | Testing procedures for magneto sparking and winding resistance. | ||
| View original record | -5- Contd. NOTE:- The minimum sparking speed can be taken to be that speed at which 100 consecutive sparks, without missing, are given by the magneto at some time within a period not greater than 5… | ||
| 05-page141 | Instructions for adjusting primary point gap and measuring armature core flux. | ||
| View original record | -5- Contd. (21) Now ascertain if gap has been altered appreciably. (22) Now vary primary point gap ± .004" above and below original setting and again observe timing. (23) The armature core flux at… | ||
| 05-page142 | Table of results from magneto performance tests. | ||
| View original record | Handwritten Top Center: X 430 Handwritten Top Right: (Filed 1-2-21) X.430. TABLE OF RESULTS OF MAGNETO PERFORMANCE. (I) | Magneto. | Type and No. | X. No. | (1) Weight (lbs) | (3) Air gap (inches) |… | ||
| 05-page143 | Data table comparing performance characteristics of various magnetos. | ||
| View original record | -2- (6) (14) (16) Magneto. Degrees of make. Maker's make advanced. Maker's break advanced. Our make advanced. Our break advanced. Lowest speeds for 5.5 mm. Adv. Cent. Retd. Remarks. Watford. 154.5… | ||
| 05-page144 | Comparison table of performance characteristics for various magnetos. | ||
| View original record | -3- Contd. | Magneto. | (17) Contact breaker flinging speed (R.P.M.) | (18) Primary resistance (ohms). | (19) Secondary Resistance (ohms). | (20) Secondary E.M.F. on 108 Volts DC | (24) Remarks. |… | ||
| 05-page145 | Instruction sheet detailing the number of earthing brushes on different magneto models. | ||
| View original record | R.R.360 (1000) (SF 349 26.1.18.) PEP 20552 X.430 91284 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To E.F.C. Order No PA. 63. Customer's No. Re X. 430. Earthing brushes on diff. Magnetos Machine | Brush behind… | ||
| 05-page146 | Comparing the performance of Bosch and Watford magnetos. | ||
| View original record | EP. and DA from Hs. c. to EY. c. to Wor. c. to E. X.427 X.430 RE. BOSCH MAGNETOS. X.2375 X 4181 Hg2/LGS.3.21. With reference to your memo. EP24/F2.3.21. Your experience with the Bosch Magneto confirms… | ||
| 05-page147 | Experimental bench tests and examination of three different magnetos. | ||
| View original record | X-430 To H & R. from EPC. c. C.J. & PH. c. Mr. A Hn. c. Un. & EP. c. EST. for R.R.Inc. EPCB/Y21.3.21. X.430 - MAGNETOS - GENERAL X 5724 X 5616 X.X.290 Independently of this note we are sending reports… | ||
| 05-page148 | Magneto ranges and the tabulation of bench test results. | ||
| View original record | Contd. -2- RPCB/T21.3.21. ranges of 34º suitably chosen independently of the makers ranges, together with remarks re the choosing of the range. This table, which we hope will be of interest, will… | ||
| 05-page149 | Sourcing and quality of B.T.H., Apollo, and American Bosch magnetos in the U.S.A. | ||
| View original record | X.430 ROLLS-ROYCE OF AMERICA INC. SPRINGFIELD, MASS. March 23, 1921. CyS-G 23321. To: Mr. Hives. From: Mr. Olley. X.3815 RE MAGNETOS. X.430. Z.3916 I have been informed on authority which may or may… | ||
| 05-page150 | Table of lowest speeds in RPM for various Watford magnetos for regular firing on 0.5mm gaps in air. | ||
| View original record | G.A.P. X430 22.3.21. X.430. MAGNETOS. TABLE OF LOWEST SPEEDS IN R.P.M. FOR REGULAR FIRING ON 0.5mm. GAPS IN AIR. N.B. Test range between advance and retard 34° in all cases (except Watford E.C.6a =… | ||
| 05-page151 | Comparison table of various magnetos, detailing their types, numbers, lowest speeds, and performance remarks. | ||
| View original record | -2- Contd. | Magneto | Type and number | X. No. | Lowest speeds. | | | Remarks |… | ||
| 05-page152 | Table of lowest speeds in R.P.M. for regular firing on various magnetos with 5.5 mm gaps. | ||
| View original record | C.A.P X.430 - MAGNETOS. TABLE OF LOWEST SPEEDS IN R.P.M. FOR REGULAR FIRING ON 5.5 mm. GAPS IN ATE. CHAIN DRIVE. N.B. Test range between advance and retard 34° in all cases. | Magneto. | Type & No. |… | ||
| 05-page153 | Table of results from magneto performance tests. | ||
| View original record | XU30 /A. G.A.P 23.3.21. X.430. - TABLE OF RESULTS OF MAGNETO PERFORMANCE. Magneto. | Type & No. | X. No. | (1) Height (lbs) | (3) Air gap | (4) H.T. Safety gap (mm) | Platinum gap (inches) | (6) Range… | ||
| 05-page154 | Comparison table of magneto performance and timing specifications for various makes. | ||
| View original record | Top Center: -1B A. Left Margin: A.E.D. or T. Dept. | Magneto. | Degrees of make. | Maker's make advanced. | Maker's break advanced. | Our break advanced. | Our break Retarded. | lowest speeds for 5.5… | ||
| 05-page155 | Comparative table of test results for various magneto models. | ||
| View original record | 4C. A. Contd. Magneto. | (17) Contact breaker tripping speed (R.P.M.) | (18) Primary resistance (ohms). | (9) Secondary resistance (ohms). | (20) Secondary m.s. on 168 volts 50~ Hor. Vert. | (24)… | ||
| 05-page156 | Table of magneto distributor dimensions, make ratios, and ignition pitch values for different magneto types. | ||
| View original record | CAP X.430. TABLE OF MAGNETO DISTRIBUTOR DIMENSIONS, MAKE RATIOS, AND RELATIVE POSITIONS OF PRACTICAL VALUES OF THE IGNITION PITCH IN EACH CASE. X.800. | Magneto. | Type. | Width of carbon brush. |… | ||
| 05-page157 | Table of results from magneto performance tests. | ||
| View original record | C.A.P. X.430 - TABLE OF RESULTS OF MAGNETO PERFORMANCE. Date. | Magneto. & Co. | Type | X. No. | (1) Height (lbs) | (3) Air gap (Inches) | (4) H.T. safety gap (mm) | (6) Platinum gap (Inches) | (9)… | ||
| 05-page158 | Comparative table of performance data for various magnetos. | ||
| View original record | -2- Magneto. | Degrees of make. | Makers make advd. | Makers break advd. | Our break advanced. | Our break retarded. | Lowest speeds for 5.5 mm. Adv. | Lowest speeds for 5.5 mm. Cent. | Lowest speeds… | ||
| 05-page159 | Specification table detailing the electrical properties of various magnetos. | ||
| View original record | -3- Contd. (17) (18) (19) (20) (24) Magneto. Contact breaker ringing speed (R.P.M.). Primary resistance (ohms). Secondary resistance (ohms). Secondary m.a. on 108 volts 50~ Remarks. Hor. Vert.… | ||
| 05-page160 | Table of magneto distributor dimensions, make ratios, and ranges for various types. | ||
| View original record | C.A.P. 24.6.21. X.430. TABLE OF MAGNETO DISTRIBUTOR DIMENSIONS, MAKE RATIOS, AND RANGES. X.500 EXPRESSED IN FRACTIONS, VALUES OF THE DISTRIBUTOR PITCH IN EACH CASE. Magneto. Type. | Width of carbon… | ||
| 05-page161 | Sourcing of magnetos, specifying preferred suppliers. | ||
| View original record | To EFC. from R. c. to CJ. X430 R2/G24.3.21. X.430. RE MAGNETOS. X.427. X.3716. X.4181. X.4279. We are not interested in any outside magnetos, so that you can concentrate on - German Robert Bosch.… | ||
| 05-page162 | Performance curves and testing results for three different magnetos. | ||
| View original record | To R. & E. from EPC. c. to CJ. & PN. c. to By. & En. c. to Da. & EP. c. to ENT. for R.R.Inc. X.430. MAGNETOS- GENERAL. Referring to our EPC5/T21.3.21 we now attach open circuit volt-speed curves and… | ||
| 05-page163 | Comparison of various magneto types, focusing on design peculiarities and low sparking speed performance. | ||
| View original record | Contd. -2- EPC5/T31.3.21. the more retarded portion of the maker's range instead of from the more advanced portion, this being the result of pecuHar-ities of the design of these two magnetos, which… | ||
| 05-page164 | Table detailing the lowest speeds in RPM for regular firing of various magnetos on 5.5mm gaps in air. | ||
| View original record | X.430. MAGNETOS. TABLE OF LOWEST SPEEDS IN R.P.M. FOR REGULAR FIRING ON 5.5mm. GAPS IN AIR. N.B. Test range between advance and retard 34° in all cases (except Watford E.O.6a. = 32°). Magneto. Type &… | ||
| 05-page165 | Comparison table of performance data, specifically lowest speeds, for different models of magnetos. | ||
| View original record | -2- Contd. | Magneto. | Type and number. | X. No. | Lowest speeds. | Remarks. | |---|---|---|---|---| | | | | Adv. | Cent. | Retd. | | | R. Bosch. | Z.R.6 | 427 | 260 | 170 | 246. | Advanced position… | ||
| 05-page166 | Table detailing the performance results of various magneto models. | ||
| View original record | A. X.430. TABLE OF RESULTS OF MAGNETO PERFORMANCE. (L) Magneto. | Type & No. | X. No. | (1) Weight (lbs). | (3) Air gap ("). | (4) H.T. safety gap. (mm). | Platinum gap (inches). | (6) Range Make… | ||
| 05-page167 | Comparative table of test results for various magneto models, detailing break points and performance speeds. | ||
| View original record | -2- A. Magneto. | Degrees of make. | Maker's make advanced. | Maker's break advanced. | Our break advanced. | Our break retarded. | Lowest speeds for 5.5 mm. | Remarks. ---|---|---|---|---|---|---|---… | ||
| 05-page168 | Comparison table of technical data for various types of magnetos. | ||
| View original record | -3- A. Contd. Magneto. | (17) Contact breaker flinging speed (R.P.M.) | (18) Primary resistance (Ohms). | (19) Secondary resistance (Ohms). | (20) Secondary m.a. on 108 volts 50~ Hor. / Vert. | (24)… | ||
| 05-page169 | Graph of open circuit volt-speed and short circuit ampere-speed curves for the primary windings of Dixie, B.T.H., and Conner magnetos. | ||
| View original record | S.C. AMPS O.C. VOLTS RPM AMPERES VOLTS B.T.H. F.M.6 CONNER C.M.1. DIXIE (AERO) 642 OPEN CIRCUIT VOLT-SPEED AND SHORT CIRCUIT AMPERE-SPEED CURVES OF PRIMARY WINDINGS OF DIXIE, B.T.H. AND CONNER… | ||
| 05-page170 | List of all magnetos detailing their type, number, and test status. | ||
| View original record | EPC. March 31st. 1921. X.430 X.430. LIST OF ALL MAGNETOS. Number available. | No. | Type | Remarks. ------------------|-----|------------|--------- | | Magnetos. | 1 | 4010 | Watford E.6. | Obtained… | ||
| 05-page171 | Continued list of available components by number, type, and status. | ||
| View original record | -2- Contd. Number available. | No. | Type. | Remarks. 1 | 142352 | Berling F.61. | 1 | 142351 | " E.61. | } Awaiting report. 1 | 142409 | " D.63 | EFC. | ||
| 05-page172 | List of points raised by Mr. Royce regarding electrical systems following Mr. Clark's visit to West Wittering. | ||
| View original record | To EPC. from E. c. to CJ. c. to Wor. c. to He. c. to KPG. X.430 KL/G31.3.21. X.3199 X.294 X.430 RE VISIT OF Mr. CLARK TO WEST WITTERING, 28TH FEBRUARY, 1921. We send you herewith list of points which… | ||
| 05-page173 | Dynamo specifications, suppliers, and design modifications, including diagrams. | ||
| View original record | Contd. -2- El/GS1.3.21. (e) Can we afford to use the Bleriot cutout? What is the difference in cost? It is very rarely that the differences in cost are sent to Mr. Royce for his consideration. (f) We… | ||
| 05-page174 | Notes on dynamo windings, ignition coils, and comparisons of various magnetos. | ||
| View original record | Contd. -3- E1/G31.3.21. (l) Mr. Clark to get out the winding with even number of teeth and dummy coil, and a moderate number of teeth, so as to use punched plates and avoid milling. This should give… | ||
| 05-page175 | Technical memorandum discussing issues with Watford magnetos, comparing their performance and weight to Bosch and Conner models. | ||
| View original record | To R. from EFC. c. to O J. c. to E. X430 EFC9/T8.4.21. X.430 - MAGNETOS - REF: E1/G31.3.21. X2375 X 3916 X4279 X2917 "Have since noticed Watford (standard E6) appear to have their armatures wrongly… | ||
| 05-page176 | Technical comparison of various magneto brands and their performance characteristics. | ||
| View original record | To EFC. from R. c. to C. c. to Wpr. c. to RY. c. to Es. c. to Da. c. to PN. c. to EP. c. to HM. X.430. MAGNETOS. X.4181 X.2375. X.3915. X.3724 X.4210. X.3917. X.427. It will be noticed from Mr.… | ||
| 05-page177 | Comparing the prices and weights of various magnetos. | ||
| View original record | To R. from EPC. c.c. C.J. S.F. X430 EPC2/111.4.21. X.430. MAGNETOS. X4497 The present quantity price of the Watford E.6 magneto as standard on the car is £12.10.0. Weight 11.7 lbs. The price in U.S.A.… | ||
| 05-page178 | Previous note on general magneto topics. | ||
| View original record | X430 To Nor. from EPC. By. Da. RP. Hes. FE. EFC3/T11.4.21. X.430 - MAGNETOS - GENERAL. The points contained in Mr. Royce's note HS/C9.4.21 have already been answered in my note EFC9/T8.4.21, copy of… | ||
| 05-page179 | Failure of U.S.A. Bosch magnetos and the advantages of a sleeve type magneto. | ||
| View original record | X430 To E.F.C. from R. Copy to E.C. " HS. " PM. RB/G11/4/21. [Stamp: ROLLS-ROYCE LTD DERBY 20 MAY 1921] MAGNETOS. x3916 x4161 x3997 x4313 My remarks on failure of U.S.A. Bosch should have referred to… | ||
| 05-page180 | Potential design improvements for magnetos, specifically regarding laminated components and efficiency. | ||
| View original record | To EFC. from R. c. to CL X.430 RE/G12.4.21. X.430 - EE MAGNETOS. X.2375. X.3209. I hope you have seen Mr. Watson's (belonging to the M.L. Syndicate) paper on Magnetos. I do not know if you have had a… | ||
| 05-page181 | Letter arranging a visit to the Watford Company to discuss machine requirements and travel logistics. | ||
| View original record | Contd. -2- RE/G12.4.21. to go and see the Watford Company, discuss the matter of our requirements to this particular machine which we are now using, and come and see me, or possibly I could meet you… | ||
| 05-page182 | Magnetos received from the U.S.A, their testing, and potential return. | ||
| View original record | To ENT. from EFC. c. Accounts Office. [X430] EPC3/114.4.21. X.430. MAGNETOS RECEIVED FROM U.S.A. [X179 X3702] One or two of the magnetos received from U.S.A are not likely to be placed on experimental… | ||
| 05-page183 | Bench test results for the Eisemann Magneto Type G.N.6. | ||
| View original record | Contd. -2- EPC3/T14.4.21. As regards results obtained on bench tests of the Eisemann magneto, these given in tabular form in the same order as given in the table dated 23.3.21 under cover of our… | ||
| 05-page184 | From EPC to E enquiring about a paper on magnetos by Mr. Watson. | ||
| View original record | To E. from EPC. X.430 - MAGNETOS. With reference to R5/G12.4.21 I have not seen a recent paper on magnetos by Mr.Watson of the M.L. Company, but I am not sure whether Mr. Royce is referring to his… | ||
| 05-page185 | Replying to a query about Magnetos X430, referencing a paper by Watson. | ||
| View original record | X 430 To EPC. from E. E4/G23/4/21. X.430 RE MAGNETOS X430. In reply to your memo EFC12/T19/4/21, I understand that the paper referred to is one by Watson, which was read at a meeting of the Institute… | ||
| 05-page186 | Magneto performance issues, particularly addressing sooted Lodge plugs and the low-speed firing of Watford magnetos. | ||
| View original record | To EPC. from R. Copy to Oc. F.H.R. Lat Bt. X.430 O R15/G28/4/21. 16 X. 430. RE MAGNETOS. X.2375 . X.1812 X.4181 X.4279 In PN's report (PHS/DH19/4/21) concerning Mr. Houdern, it will be noticed that… | ||
| 05-page187 | Tests carried out to determine magneto requirements for the 40/50 engine, focusing on spark plug polarity. | ||
| View original record | To R. from Hs. c. OJ. BN. E. c. Da. EY. EP. c. PN. EWT. for R.R.Inc. X.30 Hsl/LG5.5.21. MAGNETO REQUIREMENTS FOR 40/50 ENGINE. X.430. X.699. X.2375. We have carried out a number of tests with a 40/50… | ||
| 05-page188 | Test report on magneto performance, comparing spark gap characteristics between Bosch and Watford models. | ||
| View original record | Hsl/LGS 5.21. -2- Contd. always prefer to jump the safety spark gap if the engine is compressing air and not mixture. During the tests on the bench, we proved that if we warm the air, the spark would… | ||
| 05-page189 | Tests measuring sparking plug resistance under various engine running conditions and fuel mixtures. | ||
| View original record | Contd. -3- Hsl/LG5.5.21. This condition was with very weak mixture picking up fullthrottle from low speeds. When the engine was running normally, we measured the resistance at the sparking plug points… | ||
| 05-page190 | Engine slow running issues related to spark plug gaps and magneto performance. | ||
| View original record | Contd. -4- Hsl/LG5.5.21. With the engine running normally we found, on the road, that we get good slow running if we opened the spark gaps of the plugs to .125". There was no definite misfiring slow… | ||
| 05-page191 | Magneto ignition troubleshooting, focusing on spark plug gaps, voltage, and their effect on engine performance. | ||
| View original record | Contd. -5- Hsl/LGS.5.21. ought to be able to appreciate it when we fit another magneto which gives a spark with a higher heat value with the same gap. As a further support to this, we all know that… | ||
| 05-page192 | Engine misfiring issues with weak fuel mixtures and recommendations for magneto improvements. | ||
| View original record | Hsl/LGS.5.21. -6- Contd. If, when running with a weak mixture full throttle, the whole set of sparking plugs misfired, it would not be very serious. The driver would not be able to appreciate whether… | ||
| 05-page193 | Misfiring issues, recommending specific magnetos and discussing tests on different spark plugs and ignition coils. | ||
| View original record | Contd. -7- Hsl/LGS.5.21. it is liable to give us misfiring under full throttle weak mixture conditions. In future, however, we recommend that any magnetos we get from the Watford Company shall be the… | ||
| 05-page194 | Letter to The M.L. Magneto Synd. Ltd. requesting information on a paper about magnetos. | ||
| View original record | X. 430 EPC7/T. 6th May, 1921. The M.L. Magneto Synd. Ltd., Victoria Works, Coventry. For the attention of Mr. Watson. X 430 Dear Sirs, We have heard that you have recently read a paper on Magnetos… | ||
| 05-page195 | Letter from The M-L Magneto Synd. Ltd. enclosing a draft copy of Mr. Watson's Paper. | ||
| View original record | TELEGRAMS: "CARLTON, COVENTRY" TELEPHONE 1008 & 1009 The M-L Magneto Synd. Ltd. VICTORIA WORKS, COVENTRY. X 430 REPRESENTATIVES & AGENTS FOR HOME TRADE WITH MANUFACTURERS: BIRMINGHAM: E. J. LAWSON,… | ||
| 05-page196 | Magneto requirements, spark energy, and spark plug gap length for a 40/50 HP chassis. | ||
| View original record | Y430 To HS. from R. c. CJ. EPC. EP. PN. c. RR. America Inc. (For the attention of CY). R12/G10.5.21. X.2375. X.699. X.1812. X.430. RE 40/50 H.P. CHASSIS - MAGNETOS. With reference to your report on… | ||
| 05-page197 | Engine misfiring causes, including magneto issues, spark plug oxidisation, and carburation problems. | ||
| View original record | Contd. -2- R12/G10.5.21. which will bear longer safety gap, and it is not a question of sparking at extremely slow speed (although this may also be desirable.)and I doubt if it is a question of… | ||
| 05-page198 | Magneto ignition requirements and related engine firing issues on 40/50 HP cars. | ||
| View original record | Memo from Sr. C. to HE. C. to RPU. X430 X677 EP20/P12.5.21. X 1812 MAGNETO IGNITION REQUIREMENTS. We are glad to note your comments in R12/G10.5.21 on HE's report, which we are very pleased to see he… | ||
| 05-page199 | Spark plug positioning, magnetos, and recommendations for specific plug types to improve engine running. | ||
| View original record | -2- intermediate position of plug is better cooled in than the pocket position and is therefore less inclined to suffer from overheating of the points, but more inclined to oil and soot up. 5. It is… | ||
| 05-page200 | Faults with the Watford magneto and the adoption of a new sleeve-type magneto. | ||
| View original record | A 130 3 To C.E. From R. Copy to Mr. W. G. S. R. B. C. Acknowledged. Rolls-Royce of America Inc. (For the attention of Mr. V.) RS/G10/8/21. K4801 RE MAGNETOS. X5375 X4183 Regarding magnetos, the only… | ||
| 05-page201 | Cover letter sending reports and remarks concerning U.S.A. Bosch Magnetos. | ||
| View original record | R.R. of A. Inc. c.c. R. c.c. CJ. X430 EFC2/T17.6.21. X. 3916 - U.S.A. BOSCH MAGNETOS. X430 We send you herewith copies of my assistant's report comprising our remarks on Mr. Olley's notes CY4/G4.5.21,… | ||
| 05-page202 | Correspondence from America concerning U.S.A. Bosch magnetos. | ||
| View original record | K430 EFC. FBS. Jan. 9th 1921. X.3916 - REPORT ON CORRESPONDENCE FROM AMERICA CONCERNING U.S.A. BOSCH MAGNETOS. CY6/G28.4.21. The three breakdowns, i.e. the high tension brush post on the B.6., the… | ||
| 05-page203 | Component failures and analysis, discussing issues with fibre bushes, magnets, and a returned H.T. pencil. | ||
| View original record | Contd. -2- which is typical of the majority, in that the fibre bush works loose on the laner, and binds on the pin after between 1,000 and 2,000 miles running. It is thought that this is due to the… | ||
| 05-page204 | Investigation into the low-speed sparking performance of Z.R.6 magnetos and discussions with the manufacturer, American Bosch. | ||
| View original record | -3- Contd. Oy3/G5S21. The American Bosch people also say that they cannot explain the low speed sparking results that we get on the Z.R.6 except that the efficiency of the machine was impaired by… | ||
| 05-page205 | Magneto drive modifications from belt to chain and awaiting the arrival of Ed-19 for further testing. | ||
| View original record | -4- Contd. difference in results is due to difference in design of spark gaps, we would be pleased if they could furnish us with details of the gaps used by the Bosch people. Another point considered… | ||
| 05-page206 | Table of magneto distributor dimensions, make ratios, and ranges, expressed in fractional values of the distributor pitch. | ||
| View original record | X 430 X.430. TABLE OF MAGNETO DISTRIBUTOR DIMENSIONS, MAKE RATIOS, AND RANGES X 800 EXPRESSED IN FRACTIONAL VALUES OF THE DISTRIBUTOR PITCH IN EACH CASE. | Magneto. | Type. | Width of carbon brush. |… | ||
| 05-page207 | The utility test of a slate slab for ignition system leakage. | ||
| View original record | EFC. AB.2. X430 2nd June, 1922 X.3199 SLATE SLAB FOR UTILITY TEST. X.430. The slate slab, originally intended for a set of spark gaps, but now arranged with various terminals along its length, has… | ||
| 05-page208 | Extract from a report on a regular spark gap test with leakage resistance. | ||
| View original record | -2- Extract from a further report. The maximum regular spark gap obtainable with a leakage of about 1.0 megohm across it was in all cases 2.0 mms. Using the terminals of the slate slab employed for… | ||
| 05-page209 | Instruction sheet containing a table of magneto distributor dimensions. | ||
| View original record | R.R. 290 (500 Bks.) (SP 133, 6-11-18.) P&P. 187886 X430 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To E.F.G. Order No. P.B.4. Customer's No. X430 June 9th 1921 Table of Magneto Distributor Dimensions Magneto… | ||
| 05-page210 | Instruction sheet containing a table of make ratios and distribution sums for various magneto types. | ||
| View original record | RR.210.(250 Bks.) (P.173. &. Co. Ltd.) P.D.P. 18/5/20 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: E.F.C. Order No: P.B.7. Customer's No: X.430 Table of Magneto Make Ratios, Etc. Magneto. | Type. | Make… | ||
| 05-page211 | Test report on a slate leak for utility, examining its resistance and performance with ignition systems. | ||
| View original record | 1430 EPC. AE35. 14th Nov.1921. X.3199 SLATE LEAK FOR UTILITY TEST. X.430. The slate resistance reported AB.2.6.21, has been arranged with mercury troughs at each end to secure improved contact. Used… | ||
| 05-page212 | Continued page discussing comparative utility tests for battery and magneto ignition systems. | ||
| View original record | -2- Contd. be very suitable for comparative utility tests, on the battery ignition if used with the screw terminals, and an magneto ignition if used with the mercury contacts. It does not seem… | ||
| 05-page213 | Offer from Ercole Marelli & Co. Ltd. to demonstrate their latest magnetos. | ||
| View original record | R.R. 200 (to T.C.M. gld. 2/2/21) Dm. gphd. He. from Wd. S-10 P-225 WSB/MJ 14.7.21. [Stamp: RECEIVED] Ercole Marelli & Co. Ltd. I am sending herewith (to He) a letter from this firm (from their London… | ||
| 05-page214 | Letter from Ercole Marelli & Co Ltd regarding a new type of Magneto. | ||
| View original record | DIRECTORS - ERCOLE MARELLI - A.M. BENINI - A.M. BARDONI - ITALIAN. ERCOLE MARELLI & CO LTD ELECTRIC FAN & MOTOR MANUFACTURERS. Telegrams-AURETTA-CANNON, LONDON Cables-AURETTA, LONDON A.B.C. Code 5th.… | ||
| 05-page215 | Letter discussing ignition issues and a proposed solution using a dual magneto and battery system with a Delco switch. | ||
| View original record | X430 August 4, 1921. CC Mr. Belnap. Mr. Nadin. OY6-G4821. Dear Hives:- X.699 - RE IGNITION X.430. X.3199. I am trying to catch up with your past letters which have remained unanswered. Your letter… | ||
| 05-page216 | Replacement of fibre bushes with Bakelite-micarta bushes in magnetos. | ||
| View original record | W.R. 1924. 20M. T./C.B. 749. 12-12-20. [C. 1947] To R. from Hs. c. to CJ. c. to DM. c. to BY. c. to KP. c. to WH. c. to EWT. for R.R. Inc. X430 HeS/LG16.9.21. X430 MAGNETOS. X3913 X4275 X4411 We have… | ||
| 05-page217 | Recommendation to obtain and fit Bakelite-micarta bushes to magnetos, suggesting cabling Springfield for a supply. | ||
| View original record | Contd. -2- HSB/LC16.9.21. upsets the adjustments of the points. We recommend that we should immediately obtain Bakelite-micarta bushes and fit to magnetos on all cars we have in hand. As Springfield… | ||
| 05-page218 | Description of the general characteristics of a new type of magneto called the Magnetobloc. | ||
| View original record | X.430. Typed October 12th, 1921. X.430. THE MAGNETOBLOC. GENERAL CHARACTERISTICS. The object of the inventors of these new magnetos may be summed up thus :- 1. To obtain by new methods an… | ||
| 05-page219 | Description of an ignition magneto, covering its armature, break device, and safety gap features. | ||
| View original record | -2- Contd. base and which, being absolutely water and dust proof, affords efficient protection to the parts within. Armature. The armature core is easily adaptable for variable ignition. The contact… | ||
| 05-page220 | Description of the ignition switch and 'Magnetobloc' component of a magneto. | ||
| View original record | -3- Contd. electrodes, bad connections etc. The parts of the distribution are very accessible and are placed in the upper part of the back plate. The distribution brush of which the contact is… | ||
| 05-page221 | Table of magneto distributor dimensions, make ratios, and ranges expressed in practical values. | ||
| View original record | X.430. TABLE OF MAGNETO DISTRIBUTOR DIMENSIONS, MAKE RATIOS, AND RANGES EXPRESSED IN PRACTICAL VALUES OF THE DISTRIBUTOR PITCH IN EACH CASE. X.800. | Magneto. | Type. | Width of carbon brush. | Width… | ||
| 05-page222 | Comparison of the lowest sparking speeds between a magneto belt and a chain drive. | ||
| View original record | ROLLS-ROYCE LIMITED. INSTRUCTIONS. To E F C Order No AB. 34. Customer's No. X. 430 Nov. 1st 1921 X. 430 Comparison of Magneto Belt and Chain Drives. In comparing these drives, the lowest sparking… | ||
| 05-page223 | Test report on the effect of High Tension (H.T.) lead length on magneto sparking. | ||
| View original record | RR. 10B (500 Bks.) (SP 132/6/51. L) MDP 197033 X. 430. ROLLS-ROYCE LIMITED. INSTRUCTIONS. To E.F.C Order No A.B. 27. Customer's No. X. 430 Nov. 5th 1921 Effect of Length of H.T. Lead on Magneto to… | ||
| 05-page224 | Instruction sheet detailing test results of engine RPMs with varying H.T. cable lengths. | ||
| View original record | R.R. 299 (500 Bks.) (SP 132, 6-51-18.) PSP 18288 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To E.F.C. Order No P.B. 27. Customer's No. X 430 | Length of H.T. Cable Inches | Insulated Side negative |… | ||
| 05-page225 | Instructions detailing further tests on the effect of H.T. lead length on magneto sparks. | ||
| View original record | RR.238 (500 Bks.) (SP 17.3. 4-11-18.) MP 1978/18 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To E.E.C. Order No. P.B. 29 Customer's No. X 430 Dec 2nd 1921 Effect of Length of H.T. Lead on Magneto Spark.… | ||
| 05-page226 | Instruction sheet detailing RPM values for various cable lengths and electrical configurations. | ||
| View original record | KDF656 (500 Bks.) (SP 152-6-10-18.) MP 11/1918 ROLLS-ROYCE LIMITED. INSTRUCTIONS. Dec. 2nd 1921 To E.F.C. Order No PB. 29. Customer's No. X 430 Table: Headers: Column 1: Length of Cable Ft. Column 2:… | ||
| 05-page227 | Table of results from magneto performance tests. | ||
| View original record | X.430 - TABLE OF RESULTS OF MAGNETO PERFORMANCE. | Date. | Magneto. | Type & No. | X. No. | (1) Weight (Lbs). | (3) Air gap (Inches) | (4) H.T. safety gap (mm). | (5) Platinum gap (Inches) | (6) Range… | ||
| 05-page228 | Comparison table of magneto performance data, including spark timing and operating speeds. | ||
| View original record | -2- Magneto. | Degrees of make. | Makers make advd. | Makers break advd. | Our break advanced. | Our break retarded. | Lowest speeds for 5.5 mm. Adv. Cent. Retd. | REMARKS. Eisemann | 150.5 | +53.5 |… | ||
| 05-page229 | Technical data table detailing primary and secondary resistance and secondary milliamps for various magneto models. | ||
| View original record | -3- Contd. Magneto. (17) Contact breaker flinging speed. (R.P.M.) (18) Primary resistance (ohms). (19) Secondary Resistance (ohms). (20) Secondary m.a. on 100 volts AC~ Hor. Vert. (24) Remarks.… | ||
| 05-page230 | Letter from Ercole Marelli & Co Ltd following up on a previous conversation regarding an offer for magnetos. | ||
| View original record | DIRECTORS:-- ERCOLE MARELLI -- A. E. BEARD -- A. M. BANCHI -- ITALIAN. X 480. Telegrams: AURETTA, CANNON, LONDON Cables: AURETTA, LONDON. A.B.C. CODE 5TH & 6TH EDITIONS Telephone: CENTRAL 734. ERCOLE… | ||
| 05-page231 | Product leaflet for the Marelli Magneto Type MP4 'Monoblock' with dimensional diagrams. | ||
| View original record | Left Page: Dimensions of “Marelli,, Magnetos Type M.P.4 “Monoblock,,” Dimension Table: a b c d e f g h i l m n p q r s 55 212 96 143 38 26 132 15 48 6 95 63 122 15.5 45.5 131 71 Dimensions of conical… | ||
| 05-page232 | Product specification sheet for the Marelli Magneto Type M.P. Monoblock. | ||
| View original record | MARELLI MAGNETO TYPE M.P. "MONOBLOCK" .. for 4-cylinder engines of motor-cars, motor-lorries, etc. up to 90 m/m bore General features and special advantages. It embodies in one casting: Base, Pole… | ||
| 05-page233 | Price list and general instruction manual for Marelli Magnetos. | ||
| View original record | Page 1: MARELLI MAGNETOS have been adopted by the following important Firms: AUREA :: ANSALDO S. GIORGIO :: ALFA-ROMEO :: BALLOT BIANCHI :: BIGNAN :: DELPEUCH :: DIATTO :: FIAT GNOME ET RHÔNE ::… | ||
| 05-page234 | Specification sheet with dimensional drawings and data for various Marelli Magneto models. | ||
| View original record | MCA 1-2-V HCR 1-2-V MHD 1-2 MG 4 MHP 6 MFT 8 MFT 12 MP 4 Dimensions of Marelli Magnetos Models: MCA 1, MCA 2-HD, MCAV, MCB 1, MCB 2-HD, MCBV, MHD 1, MHD 2-HD, MP 4, MHP 6, MG 4, MF 12 Data Table: a:… | ||
| 05-page235 | Specification sheet for Marelli Magnetos for single and twin cylinder engines. | ||
| View original record | DIRECTORS:- ERCOLE MARELLI - A. S. BENNI - A. M. BARONI - ITALIAN. ERCOLE MARELLI & Co., Ltd. Sole Agents for FABBRICA ITALIANA MAGNETI MARELLI MILAN - Italy Telephone - CENTRAL 716. Telegrams -… | ||
| 05-page236 | Product specification sheet for Marelli Magnetos for 4, 6, 8, and 12 cylinder engines. | ||
| View original record | DIRECTORS: - ERCOLE MARELLI. - A. S. BENN. - A. M. BARTON - ITALIAN. ERCOLE MARELLI & Co., Ltd. Sole Agents for FABBRICA ITALIANA MAGNETI MARELLI MILAN - ITALY Telephone - CENTRAL 786. Telegrams -… | ||
| 05-page237 | Sales letter from The Salmson Magneto Company regarding their motor car magnetos and an enclosed catalogue. | ||
| View original record | Telegrams: WINNOW, CANNON, LONDON. Telephone: CENTRAL 2060. THE SALMSON MAGNETO COMPANY. E. B. Kimmins SOLE CONCESSIONAIRES FOR SALMSON MOTOR CAR MAGNETOS. WORCESTER HOUSE, WALBROOK, LONDON. E.C.4 As… | ||
| 05-page238 | Letter from Ercole Marelli & Co Ltd regarding the availability and sale of 'Marelli' Magnetos. | ||
| View original record | DIRECTORS: ERCOLE MARELLI - A.S. BERLI - A.W. BARDONI - ITALIAN. ERCOLE MARELLI & Cº LTD ELECTRIC FAN & MOTOR MANUFACTURERS. Telegrams: AURETTA, CANNON, LONDON Cable: AURETTA, LONDON A.B.C. Code 5th &… | ||
| 05-page239 | Assessment of the Delage car's ignition system, comparing magnetos with battery ignition. | ||
| View original record | 1430 Extract from:- R1/M26.6.22. X3144 THE DELAGE CAR. (1) If this is a specimen of Delage effort to cutout R.R. it is not a bit like R.R. (2) Double spark magnetos which naturally require double the… | ||
| 05-page240 | Table detailing the lowest speeds in RPM for regular firing of various magnetos. | ||
| View original record | VG30 3D. 25.7.22. X.430. MAGNETOS. TABLE OF LOWEST SPEEDS IN R.P.M. FOR REGULAR FIRING ON 3RD TEL. GAPS IN AIR. CHAIN DRIVE. N.B. Test range between advance and retard 34° in all cases. | Magneto. |… | ||
| 05-page241 | Comparison table of different magneto models detailing their lowest operational speeds and performance remarks. | ||
| View original record | -2D Contd. Magneto. | Type and number. | X. No. | Lowest speeds. | Remarks. ---|---|---|---|--- | | | Adv. | Comb. | Retd. | R. Bosch. | Z.R.6. 2571556. | 427. | 260 | 170 | 246. | Advanced position… | ||
| 05-page242 | Table detailing the lowest speeds in RPM for regular firing of various magnetos. | ||
| View original record | E.T.C. 10 22.3.21. X.430. MAGNETOS. TABLE OF LOWEST SPEEDS IN R.P.M. FOR REGULAR FIRING ON 5.5mm. GAPS IN AIR. N.B. Test range between advance and retard 34º in all cases (except Watford E.C.6a -… | ||
| 05-page243 | Promotional letter from The Salmson Magneto Company regarding their motor car magnetos. | ||
| View original record | Telegrams: WINNOW, CANNON, LONDON. Telephones: CENTRAL, 2660 THE SALMSON MAGNETO COMPANY. E.R.KIMMINS SOLE CONCESSIONAIRES FOR SALMSON MOTOR CAR MAGNETOS. WORCESTER HOUSE, WALBROOK, LONDON, E.C.4 9th… | ||
| 05-page244 | The trial of a standard test gap on magneto and coil ignition systems. | ||
| View original record | Y430 EFC. PB.80. Feb 8th 1923. TRIAL OF STANDARD TEST GAP ON MAGNETOS AND COIL IGNITION. For the purposes of this gap, a third point spark gap was used, and adjusted so that regular sparking would… | ||
| 05-page245 | Continuation of a test report on the effects of an external gap on sparking for magnetos and coils. | ||
| View original record | -2- Contd. It appears that with the leak at its present value, the test is reasonable for the magneto, and also for the coil on 12 volts, but rather severe for the coil on 8 volts. During some… | ||
| 05-page246 | Tests investigating the effect of temperature on the conductance of a chemical leak for a standard gap. | ||
| View original record | EPC. PB.83. March 8th 1923. X.430. CHEMICAL LEAK FOR STANDARD GAP. X.3199. During some tests on coils, in which the chemical leak was used, it was observed that under certain conditions of speed,… | ||
| 05-page247 | The conductance of a chemical leak at various temperatures. | ||
| View original record | EFC. PB.85. March 14th. 1923. X.430. X.3199 CHEMICAL LEAK. The conductance of this leak in its new form is much too high, being about 257.0 micromhos at a temperature of 18.0OC. It has, however, been… | ||
| 05-page248 | Table of lowest speeds in RPM for regular firing of various magnetos (Condor & Hawk size). | ||
| View original record | x430 4D. 14.9.23. X.430. MAGNETOS. (CONDOR & HAWK SIZE) TABLE OF LOWEST SPEEDS IN R.P.M. FOR REGULAR FIRING ON 5.5 MM. GAPS IN AIR. CHAIN DRIVE. N.B. Test Range between advance and retard 58° in all… | ||
| 05-page249 | Progress report on the experimental testing of various magnetos. | ||
| View original record | X.430. - PROGRESS OF EXPERIMENTAL MAGNETO TESTING. Magneto. | Type. | X. No. | Number available. | Wt Weight (lbs) | Inspection. | Prel. Report. | Routine Tests. | Report of Tests. | Remarks --- | ---… | ||
| 05-page250 | Progress report table for experimental magneto testing, detailing models, quantities, weights, and test completion statuses. | ||
| View original record | X. 430 - PROGRESS OF EXPERIMENTAL MAGNETO TESTING. Magneto. | Type. | X. No. | Number available. | Weight (lbs) | Inspection. | Prel. Report. | Routine Tests. | Report of Tests. | Remarks. Conner |… | ||
| 05-page251 | Request for specification tests required on a list of magnetos for various engines and chassis. | ||
| View original record | X.430. EFC. Ex War BFTC/MN.29.11.23. X.430. RE. MAGNETO TESTS. X.325 Will you please let us have at once specification tests required on the following Magnetos:- ✓ { B.T.H. A.V.12.S. Falcon. { B.T.H.… | ||
| 05-page252 | Magneto test specifications and a request for magneto samples. | ||
| View original record | To SFT. from EPC. X.430 EFC1/T18.12.23. X 430 RE MAGNETOS. Answering your SFT9/ENN17.12.23. The specification of test for the E.O.6 magnetos will follow shortly and the others will follow in due… | ||
| 05-page253 | Design of fabric couplings for magneto and dynamo drives, referencing blueprint Lec.1821 and proposing size increases. | ||
| View original record | X 480 S E C R E T. To R. from E. c. to CJ. HG. Hs. BY. E. A. C. E5/M31.1.24. RE. FABRIC COUPLINGS FOR MAGNETO AND DYNAMO DRIVE. X. 9790 X.9100 X. 9660 X.9120 Please find attached blue print Lec.1821… | ||
| 05-page254 | Letter to Messrs. North & Sons detailing a proposed practical test for magneto magnets, specifically for the R.O.1. Magnetos. | ||
| View original record | X.430. EFC1/LG. c. to WD. c. to BY. c. to EP. 14th. Feb. 1924. Messrs. North & Sons, Whippendell Rd., Watford. Dear Sirs, For the attention of Mr. North. TESTING OF MAGNETO MAGNETS. During the recent… | ||
| 05-page255 | Continued discussion on testing methods for magnets, armatures, and treated magnet steel. | ||
| View original record | contd:- -2- in which to work an armature, are, the remanence on the one hand, and the coercive force on the other, and that roughly the product of the two constitutes a figure of merit for the treated… | ||
| 05-page256 | Oil retainer design, magneto ignition governing, and brake control issues for the 3rd E.A.C. Engine. | ||
| View original record | X9790 SECRET To Hs. from R. RG. E. DA. c. CJ. BJ. BY. WOR. PN. EP. R1/M1.2.24. X.3949. X.8790. 3rd E.A.C. ENGINE I was extremely pleased to hear that the design of oil retainer at the rear end, that… | ||
| 05-page257 | With suggestions for improving the design of Magneto Fabric Couplings. | ||
| View original record | X8790 SECRET R1/MS.2.24. To E.A.C. RG. FROM R. RE. E.A.C. MAGNETO FABRIC COUPLINGS. X.8790 X.9100 These seem O.K. but I should like to point out :- (1) That you should use a really strong and large… | ||
| 05-page258 | Secret memorandum discussing ignition issues and magneto options for the EAC engine. | ||
| View original record | X-8790 Extract from R3/M9.2.24. SECRET - EAC. ENGINE. IGNITION. X.9790.X.9780. Evidently ungoverned magneto will spoil this engine both in getting away after tuffing up, detonations, and slow running… | ||
| 05-page259 | New magneto and its design improvements to reduce noise in the Watford EC6. | ||
| View original record | MAD/AR.430. 27.2.24. FC. This is a description of a new magneto you might possibly find of interest. The paragraphs underlined are points of design incorporated in this magneto which would improve the… | ||
| 05-page260 | Article from 'The Autocar' magazine detailing the stringent tests and construction of the new four-cylinder Peel-Conner Magneto. | ||
| View original record | 254 THE AUTOCAR, February 8th, 1924. ENSURING THE VITAL SPARK. Stringent Tests and Minute Attention to Details Designed to Give the New Four-cylinder Peel-Conner Magneto an Exceptionally Long Life.… | ||
| 05-page261 | Article from 'The Autocar' magazine discussing petrol prices in the U.S.A., opposition to increases, and the unlikelihood of an oil famine. | ||
| View original record | X.430 P.T.O 262 THE AUTOCAR, February 8th, 1924. PETROL PRICES IN THE U.S.A. Considerable Opposition to Increased Fuel Prices. No Possibility of an Oil Famine. FOR some weeks past various… | ||
| 05-page262 | Regulations and an acceptance letter for the 1924 R.A.C. Small Car Trials. | ||
| View original record | 256 THE AUTOCAR, February 8th, 1924. "THE AUTOCAR" AND THE R.A.C. TRIALS. Committee of the Club Accepts our Offer of Cups and Souvenirs for the Best Performances in the Three Lowest Priced Categories… | ||
| 05-page263 | Magazine page discussing ignition components, insulation testing, and motoring in the West Indies. | ||
| View original record | THE AUTOCAR, February 8th, 1924. 255 Ensuring the Vital Spark. Normal in its design, the rocker type contact breaker exhibits a close attention to detail. The baseplate and the rocker arm are made… | ||
| 05-page264 | Design and reliability of a locked switchbox and ignition system, comparing various options. | ||
| View original record | To E. from R. c. CJ. BJ. RG. WOR. DA. HS. PN. EPC. BY. EP. x8790 SECRET. R8/M28.3.24. LEC. 1849. LOCKED SWITCHBOX & EAC. IGNITION X.9730. X.9780. x8790 I wrote to you hurriedly about this. (1)… | ||
| 05-page265 | Chemical leak utility tests for magneto and battery ignition systems. | ||
| View original record | Y430 EFC. WA.28. 5.5.24. CHEMICAL LEAK FOR UTILITY TESTS ON MAGNETO AND BATTERY IGNITION. After considerable experimental work the ska conductance of the stove has been fixed at a suitable figure.… | ||
| 05-page266 | Table of magneto distributor dimensions, make ratios, and ranges. | ||
| View original record | X 730 X.430. TABLE OF MAGNETO DISTRIBUTOR DIMENSIONS, MAKE RATIOS, AND RANGES EXPRESSED IN FRACTIONAL VALUES OF THE DISTRIBUTOR PITCH IN EACH CASE. X.800. | Magneto. | Type. | Width of carbon brush. |… | ||
| 05-page267 | Recommendations for the assembly and timing procedure of Dynamo and Magneto Drives for model EAC.111. | ||
| View original record | To BY. from Hs. c. to BY/Shn. S E C R E T Hs1/LG13.5.24. X8790 EAC.111. DYNAMO & MAGNETO DRIVES. X411c xg100 xg120 We recommend that the Works are instructed, that when these Drives are erected, the… | ||
| 05-page268 | Reduction in the maximum engine speed for the 40/50 HP model. | ||
| View original record | To E.F.C. from Hs. X 8790 HS3/LG27.5.24 SPECIFICATION OF MAGNETO ON 40/50 HP. We consider the maximum speed of 3,300 revs. is too high for a 40/50 HP. engine. At the present time the valves leave… | ||
| 05-page269 | Meeting about magneto requirements and alternatives, specifically regarding the Scintilla magneto. | ||
| View original record | To Hs. from EFC. C.c. Mr. Hancock, C. E. S E C R E T. x8790 E.A.C. RFC2/T27.5.24. X.9790 - MAGNETO FOR E.A.C. x4187 Mr. Watson of the M.L. Company duly came yesterday but not Mr. Lister. I got on… | ||
| 05-page270 | The specification of safety spark gaps in breakdown voltage versus millimetres for different magneto types. | ||
| View original record | Contd. -3- EPC2/T27.5.24. One of the things Mr. Watson said was that he considered the safety spark gap should be specified in breakdown voltage, and he suggested the figure of 12000 volts. He said it… | ||
| 05-page271 | Performance specification for a six-cylinder magneto with automatic advance for the R.H. 40/50 car. | ||
| View original record | 27.5.24. SPECIFICATION OF PERFORMANCE OF SIX-CYLINDER MAGNETO (WITH AUTOMATIC ADVANCE) FOR R.H. 40/50 CAR. (1) The weight of the magneto complete with automatic advance mechanism but otherwise without… | ||
| 05-page272 | Test procedures for a magneto, including endurance, short circuit, open circuit, and utility tests. | ||
| View original record | -2- Contd. (a) A short endurance test in which the magneto shall be run for 7 hours at a speed of 2000 r.p.m. with timing lever fully advanced (hand range), sparking being caused to take place on a… | ||
| 05-page273 | Performance and timing specifications for a magneto system. | ||
| View original record | -3- (6) The magneto shall be capable of firing regularly in sequence the six 5.5 mm. third point spark gaps in air at a speed of 3500 r.p.m. in the fully advanced position. (7) The magneto shall… | ||
| 05-page274 | Confirming the magneto armature speed specification for the 40/50 car. | ||
| View original record | x9790 To Hs. from EFC. SPECIFICATION OF MAGNETO FOR 40/50 CAR. x4187 The 3,300 r.p.m. is of course the magneto armature speed. You will remember that we settled this point before, and decided that… | ||
| 05-page275 | Letter to suppliers discussing the specifications for a six-cylinder magneto with automatic advance for the 40/50 car. | ||
| View original record | X8790 (for 1317) Sent to:- The Lucas Elect Co. The M.L. Magneto Syndicate Ltd. Birmingham. Victoria Wks. Coventry, (+4/T) EPCS/T. 29th May, 1924. Dear Sirs, Re Six-Cylinder Magneto (with automatic… | ||
| 05-page276 | Notes on six-cylinder magneto requirements for the 40/50 car, focusing on automatic advance mechanisms. | ||
| View original record | NOTES RE SIX-CYLINDER MAGNETO REQUIREMENTS FOR R.H. 40/50 CAR. One of the principal points of difference between the magneto now required and most magnetos which have been so far made, is that an… | ||
| 05-page277 | Magneto ignition systems, advance mechanisms, and sparking requirements for an engine. | ||
| View original record | Contd. -2- 29.5.24. One of these methods is, of course, the movable sleeve between the pole pieces and armature of the magneto, which in magnetos subject to the hand advance only is turned round by… | ||
| 05-page278 | Magneto and spark plug performance, analysing spark gap size and voltage requirements to prevent misfires. | ||
| View original record | 29.5.24. -3- Contd. With a long spark gap, the current amplitude of the initial oscillatory spark is greater, and the volume of the ensuing arc correspondingly less, and vice versa. In a short gap,… | ||
| 05-page279 | Magneto design, comparing revolving armature with revolving magnet types like the Scintilla. | ||
| View original record | Contd. -4- 29.5.24. compromise in which the magneto is capable of satisfactorily coping with only moderately leaky conditions. This higher voltage requirement necessitates particularly good insulation… | ||
| 05-page280 | Continued page of a document detailing magneto specifications and performance requirements. | ||
| View original record | 29.5.24. -5- Contd. As regards the specification of the utility test (item No.5) in accordance with our remarks above, this will not be made difficult for the magneto to satisfy. There need in this… | ||
| 05-page281 | Preliminary remarks and notes on the specification for a six-cylinder magneto with automatic advance for the 40/50 car. | ||
| View original record | X430 PRELIMINARY REMARKS IN CONNECTION WITH NOTES ON SIX-CYLINDER MAGNETO WITH AUTOMATIC ADVANCE FOR R.R. 40/50 CAR. A preliminary tentative specification of performance of six-cylinder magneto with… | ||
| 05-page282 | Magneto requirements for the EAC.2 engine and a tentative specification for a new six-cylinder magneto. | ||
| View original record | To Wd. from EFC. c. BY. HS. E. c. EP. X8790 EFC4/T30.5.24. X.9790 - MAGNETO FOR EAC.2 ENGINE. Herewith please receive copy of some notes we have made up with regard to magneto requirements for EAC.2… | ||
| 05-page283 | Continued memorandum regarding Scintilla magnetos, including booklets, blueprints, and a draft specification. | ||
| View original record | Contd. -2- 30.5.24 EPC4/T30.5.24. (a) Scintilla booklet giving full dimensions of the AM6-A and AGS-A type magnetos (see pp.32/3.) (b) Blueprint to E. and photostat and blueprint to Ry. of dimension… | ||
| 05-page284 | Table of sparking voltages for various gap sizes using a 3-point gap, and for specific magnetos. | ||
| View original record | EFC. WA. 43. X.430 X.430. X.918. X.699. SPARKING VOLTAGES FOR VARIOUS GAPS USING A 3-POINT GAP. Gap in mm. R.M.S. Volts. Peak volts. 2.5 3460 4900 3.0 3880 5500 3.5 4350 6150 4.0 4900 6950 4.5 5200… | ||
| 05-page285 | Curve graph showing sparking voltage against gap for a 3-point gap with Mascot electrodes. | ||
| View original record | SPARKING VOLTAGE - GAP CURVE USING A 3-POINT GAP WITH MASCOT ELECTRODES ORDINARY PLUG (LODGE) 2 POINTS TUNGSTEN MASCOT PLUG (R.R.Co) 8000 7000 6000 5000 4000 10 11 12 No. 226 / 14.12.20 | ||
| 05-page286 | Progress report table for experimental magneto testing, listing various models and their test statuses. | ||
| View original record | X. 430 - PROGRESS OF EXPERIMENTAL MAGNETO TESTING. | Magneto. | Type. | X. No. | Number Available. | Weight (lbs) | Inspection. | Prel. report. | Routine Tests. | Report of Tests. | Remarks. |… | ||
| 05-page287 | Hoping the next 40/50 or R.A.C. car will have a governed magneto. | ||
| View original record | TO HS. FROM R. x 8790 R5/A30.6.24. I hope the next 40/50 or R.A.C. car that comes to WW. will have governed magneto. R. | ||
| 05-page288 | Ignition systems, detonations, and the testing of magnetos with automatic advance for the 40/50 model. | ||
| View original record | To Hs. from R. c. to BJ. c. to RG. EFC. c. to HY. E. c. to PN. H. c. to EP. X8790 RL/10.7.24. RE IGNITION & DETONATIONS. 40/50 ETC. X.9790. X.8780. My own experiences confirm that it is not good to… | ||
| 05-page289 | Comparing the characteristics of magneto and battery ignition systems with a corresponding graph. | ||
| View original record | X9790 SECRET S.A.C.II. IGNITION. R1/M14.7.24. To E. & Hs. from R. c. CJ. BJ. Wor. c. Rg. By. SFC. c. Da. PN. SCINTILLA MAGNETO & R.R. BATTERY. X.9780. X.9790. X.4187. It was pointed out that by… | ||
| 05-page290 | Technical document detailing the advantages and electrical properties of an annular spark gap. | ||
| View original record | COPY. EFC1/T16.7.34. THE ANNULAR SPARK GAP. The chief advantages of the annular spark gap are :- (1) Constancy in operation. (2) Low impulse ratio. (3) Ease of manufacture. (4) Long Life. The ideal… | ||
| 05-page291 | Calculation of excess potential and electric force between a central wire and an outer cylinder. | ||
| View original record | EPCL/T16.7.24. -2- Contd. The excess of potential (V) of the central wire over that of the outer conducting cylinder will then, by the definition of potential (as work done on unit charge) be - ∫… | ||
| 05-page292 | Mathematical analysis of electric force and potential difference in relation to wire diameter. | ||
| View original record | Contd. -3- EFCl/T16.7.24. The two effects balance one another if d/da (a log_e b/a ) is zero. This is the case if a . -b/a^2 + log_e b/a = 0 if log_e b/a = 1 i.e. if b/a = e b = ea or a = 1/e b It is… | ||
| 05-page293 | Technical analysis of annular spark gap design, discussing wire to hole diameter ratios and discharge characteristics. | ||
| View original record | Contd. -4- EFC1/T16.7.24. It appears from the above that in the annular spark gap, the ratio of the wire diameter to the hole diameter should be at least equal to d/D = .368, in order to prevent the… | ||
| 05-page294 | Comparison of electric force in a concentric sphere gap versus a cylindrical gap, with relevant formulas. | ||
| View original record | -5- COMPARISON OF CONCENTRIC SPHERE GAP WITH ABOVE. If the gap be a concentric sphere gap, instead of a concentric cylindrical gap (though this is not so practical a case), it is interesting to note… | ||
| 05-page295 | Secret memorandum outlining the reasons for not using the Scintilla magneto on the RAC.2 model. | ||
| View original record | X8790 EFC. To Hs. from R. c. CJ. BJ. SECRET RR/M24.7.24. E.A.C. RE MAGNETOS. X.4187. X.8790. X.430. For the following reasons we have decided that the Scintilla magneto had better not be used on RAC.2… | ||
| 05-page296 | Test report comparing the sparking performance of Mea and Eisemann magnetos. | ||
| View original record | EFC. WA.69. X.430 20.8.24. RE MEA MAGNETO AND EISEMANN MAGNETO. X.177 X430 X.178 Both these magnetos were tested using a 3.5 mm. H.T. gap, as neither of them appeared capable of sparking regularly… | ||
| 05-page297 | Graph plotting automatic magneto advance characteristics against revolutions per minute for present and proposed arrangements. | ||
| View original record | R.R. RESEARCH DEPARTMENT. ADVANCE CURVES OF MAGNETO. DRG No G.S.F. 598. TEST No 1629. Appd. A.F.S. Ref No M.10/4. Date 16.5.21. REFERENCE MAGNETO. No 2888. AUTOMATIC ADVANCE CHARACTERISTICS. MAGNETO… | ||
| 05-page298 | List of procedures for the comparison of experimental magnetos. | ||
| View original record | X 430 X.430. COMPARISON OF EXPERIMENTAL MAGNETOS. 2.9.24. (1) The weight of the magneto complete but without pulley, shall be taken. (2) Some general remarks with regard to mechanical and electrical… | ||
| 05-page299 | Page detailing a series of electrical tests for a magneto, including short circuit, open circuit, and utility tests. | ||
| View original record | -2- Contd. of H.T. third point spark gaps in air, set to 5.5 mm. (7) Immediately following the above, the magneto shall be subjected to a short circuit test in which it is run at 1500 r.p.m. for half… | ||
| 05-page300 | Page of a magneto test procedure outlining various electrical load and spark gap conditions. | ||
| View original record | -3- Contd. (a) Nothing connected across. (b) The secondaries of the two Remy coils in series connected across, one Remy primary to be short circuited. (c) Ditto, but with both Remy primaries short… | ||
| 05-page301 | Testing procedures for magneto sparking regularity and firing speeds at different advance positions. | ||
| View original record | -4- Contd. Note. It will generally be found that the capacity of regular sparking depends to some extent on the polarity of the spark. Therefore in the above it is to be understood that the one of the… | ||
| 05-page302 | Test procedures for a primary point gap, magneto break, and observing machine operation. | ||
| View original record | -5- Contd. (15) Ascertain firstly that primary point gap has not been appreciably altered during the above test, and secondly observe the effect on the primary and magneto break, caused by varying the… | ||
| 05-page303 | Table of results of magneto performance tests. | ||
| View original record | 2A. X.430. TABLE OF RESULTS OF MAGNETO PERFORMANCE. Date. | Magneto. | Type & No. | X.No. | (1) Weight (lbs) | (2) Air gap (Inches) | (4) H.T. safety gap (mm) | (5) Platinum gap (inches) | (6) Range… | ||
| 05-page304 | Comparison table of various magneto specifications and performance data. | ||
| View original record | 29. Magneto. | Degrees of make. | Makers make adv. | Makers break advd. | Our break advanced. | Our break retarded. | Lowest speeds for 5.5 m/m. Adv. | Lowest speeds for 5.5 m/m. Cent. | Lowest speeds… | ||
| 05-page305 | Specification table for various magneto models detailing their electrical resistance and performance data. | ||
| View original record | 2C. Contd. | Magneto. | (17) Contact breaker flinging speed. (R.P.M.) | (18) Primary resistance (ohms). | (19) Secondary resistance (ohms). | (20) Secondary m.a. on 108 volts 50~ Max. Min. | (24)… | ||
| 05-page306 | Comparing the performance of English magnetos versus German Bosch magnetos in post-war and pre-war vehicles. | ||
| View original record | X480 To C.J. from Hs. Hs4/LG22.9.24. RE. MAGNETOS. X430 X407 With reference to your CJ6/ E19.9.24. The early magnetos fitted to post-war chassis were not all that could be desired. They suffered from… | ||
| 05-page307 | Revised specification for the performance of a 6-cylinder magneto, including experimental work on annular spark gaps. | ||
| View original record | To R. & E. from EPC. c. CJ. & PN. c. Wor. Hy. EP. c. De. HB. X8790 EFCS/T20.10.24. RE MAGNETOS. X8790 X4645 Following the formulation of our Specification of Performance of 6-cylinder Magneto (with… | ||
| 05-page308 | Experiments to standardize a 'leak' component for testing magneto performance under simulated sparking plug conditions. | ||
| View original record | Contd. -2- EFC3/T20.10.24. variation of conductivity with temperature, and it has been finally decided that the leak forming an integral part of the combination supplied by the Lucas Co. is the most… | ||
| 05-page309 | Investigation into electrostatic principles of annular gaps and spark-over voltage using different electrode sets. | ||
| View original record | Contd. -3- EFC3/T20.10.24. exhibited a coronal discharge preceding the spark-over. This was definitely visible in the case of the Lucas gap. On electrostatic principles, in order to obviate this, the… | ||
| 05-page310 | Technical table detailing measurements and observations for different annular gaps. | ||
| View original record | X.4645. ANNULAR GAPS. 8.10.24. | Gap particulars. | Spindle dia. (a) (mm.) | Spindle dia. (a) (Inches) | Hole dia. (b) (mm.) | Hole dia. (b) (Inches) | Gap (mm) b-a/2 | b/a | a/b | Remarks. |… | ||
| 05-page311 | Magneto performance, including electrostatic principles, standardized test gaps, and comparative bench tests. | ||
| View original record | Contd. -4- EFC3/T20.10.24. It appears that there is not the definite change in passing through the ratio e that might be anticipated on electrostatic principles, though it appears that, from the… | ||
| 05-page312 | Instructions for a standardised gap and chemical leak test on various magnetos to complete performance specifications. | ||
| View original record | An easy Copy must be sent to W.O.D. on completion X.430 ROLLS-ROYCE LTD. INSTRUCTIONS. To: E.Y.B Order No. W.A 89 Customer's No. X 430 Standardised Gap & chemical leak test on Various magnetos For the… | ||
| 05-page313 | Instruction sheet detailing test results for various magnetos, including speed ranges and operating conditions. | ||
| View original record | no cost here more than on average for repairs ROLLS-ROYCE LTD. INSTRUCTIONS. To Order No. W.A 89(2) Customer's No. Magneto | No. | Speed range | Condition ---|---|---|--- R. Bosch | 2S71555 | 1020 to… | ||
| 05-page314 | Instruction setting the specification speed limits from 700 rpm to 2800 rpm for magneto speeds. | ||
| View original record | ROLLS-ROYCE LTD. INSTRUCTIONS. To Order No. WA 89(3) Customer's No. 19 From the above results it is thought that the speed limits for our specification should be from 700 rpm to 2800 rpm (magneto… | ||
| 05-page315 | Letter to Lucas Elec Co. detailing alterations to the specification for a six-cylinder magneto. | ||
| View original record | X8790 Also sent to:- Lucas Elec. Co. (EFC4/T. M.L. Magneto Syndicate (EFC5/T. EFC4/T. 27th October, 1924. Messrs. The Lucas Elec Co., Well Street, Birmingham. Dear Sirs, With further reference to our… | ||
| 05-page316 | The concluding page of a specification document, noting that the speed range may be subject to alteration. | ||
| View original record | -2- This specification is now complete in every detail to the best of our present knowledge, though the speed range given in par. (5) may be susceptible to alteration. Yours faithfully, FOR… | ||
| 05-page317 | Experimental comparison report on three magnetos: Watford ZC6, R. Bosch ZR.6, and B.T.H. CE.6. | ||
| View original record | X430 To R. & E. from EFC. c. CJ. & BJ. c. EY. EP. Wor. c. Da. Hs. EPCI/T3.11.24. X.430. MAGNETOS - AND IN PARTICULAR PRESENT STD. WATFORD ZC6, R. BOSCH ZR.6., AND B.T.H. CE.6. As referred to in our… | ||
| 05-page318 | Tests of primary point gaps, contact breaker timing, endurance, and utility for three magneto models. | ||
| View original record | Contd. -2- EFC1/13.11.24. (4) Primary point gaps .012", .012" and .015", respectively. Contact breaker timing. Referring to the position of maximum flux of the armature (dead slow), i.e. the position… | ||
| 05-page319 | Results of performance tests on various magneto ignition systems under different configurations. | ||
| View original record | -3- Contd. (a) Nothing connected across. (b) The secondaries of the two Remy coils in series connected across, one Remy primary being short-circuited. (c) Ditto, but with both Remy primaries… | ||
| 05-page320 | Comparison of performance characteristics for various magneto models. | ||
| View original record | Contd. -4- EFCL/T3.11.24. The above is not strictly comparable because the R. Bosch machine has a much bigger range and the B.T.H. a smaller range than the Watford. In comparing, however, the Bosch… | ||
| 05-page321 | The high and low-speed sparking characteristics of various magneto models. | ||
| View original record | -5- Contd. (12) High speed sparking characteristics. The highest speed at which the magnetos were capable of firing regularly in sequence six 5.5 mm. three-point spark gaps in air in the fully… | ||
| 05-page322 | Investigation into the low speed sparking characteristics and performance of standard E06 machines. | ||
| View original record | -6- Contd. In this connection of low speed sparking characteristics, we have investigated the performance of a number of standard E06 machines because it appeared that some machines which had been in… | ||
| 05-page323 | Table of low-speed sparking results for the Standard E06 Watford Magneto. | ||
| View original record | -6- X.4181c. STANDARD E06 WATFORD MAGNETO. Low speed sparking results. Magneto No. | Date Taken. | Circumstances. | Advance. | Central. | Retard. ---|---|---|---|---|--- 50410 | 25.4.22. | One of the… | ||
| 05-page324 | Performance comparison report of Watford, R. Bosch, and B.T.H. magnetos, focusing on electrical output and noise levels. | ||
| View original record | -9- Contd. (14) Maximum and minimum m.a. taken by the secondary windings at 100 volts A.C. 50 cycles were :- Maximum. Minimum. Watford. 17.1 11.0 R.Bosch. 9.0 4.8 B.T.H. 9.3 8.0 (16) Silence of the… | ||
| 05-page325 | Forwarding a leaflet from Magdynamo Engineering Co. Ltd. concerning their ZU-4 magneto. | ||
| View original record | X. 430. EFC. from Wd. Wd22/AJ/19.12.24. Magdynamo Engineering Co. Ltd. I send you a leaflet from these people. I do not suppose that their ZU-4 magneto has any interest whatever for us. Wd. Leaflet… | ||
| 05-page326 | List of positive rotation magnetos in the laboratory with condition remarks. | ||
| View original record | X 430 9.1.25. LIST OF POSITIVE ROTATION MAGNETOS AT PRESENT IN LAB. Make. Type. No. Remarks. S.E.V. C6 186909. O.K. American Bosch. ZR6 3385100. " " B6 3002660. " Robert Bosch. ZF.6. 2490573. " "… | ||
| 05-page327 | And comparing various ignition control schemes for the 'V' Series engine. | ||
| View original record | HS. R. ) DA. EY.) from R. CJ. PJ.) PN. CWB.) X8990 SECRET RL/M31.1.25. E. A. C. 'V' SERIES IGNITION CONTROL. X.8685. X.4187. X.8680. X.8890. I have written at various times my reasons for this scheme,… | ||
| 05-page328 | Note discussing potential detonation issues with separate governors and wide-apart spark plugs. | ||
| View original record | Contd. -2- sufficiently reliable - my only anxiety. In the case of 2 separate governors one may act more quickly, and also both may be somewhat erratic and cause inexplicable detonations especially if… | ||
| 05-page329 | Specification of performance for a 6-cylinder magneto without automatic advance for the 40/50 car. | ||
| View original record | X8190 25.2.25. SPECIFICATION OF PERFORMANCE OF 6-CYLINDER MAGNETO (WITHOUT AUTOMATIC ADVANCE) FOR H.R. 40/50 CAR. (1) The weight of the magneto complete but without coupling shall not exceed 13 lbs.… | ||
| 05-page330 | Magneto utility and spark testing procedures under various conditions. | ||
| View original record | -2- Contd. (5) The magneto shall now be subjected to a utility test, i.e. a test to find out its capability of producing sparks under adverse (i.e. leaky) plug conditions. For this purpose a 3.0 mm.… | ||
| 05-page331 | Specifications for magneto operation, including minimum sparking speed, timing, silence, and direction of rotation. | ||
| View original record | -3- Contd. Note:- The minimum regular sparking speed can be taken to be that speed at which 100 consecutive sparks, without missing, are given by the magneto at some time within a period not greater… | ||
| 05-page332 | Literature from Marelli Magnetos about their use by Italian and French car manufacturers. | ||
| View original record | .X, 430. Hs. from ROY. G. to EHS. ROY6/HS25.4.28. Attached (to Hs) is a batch of literature to hand from Marelli Magnetos (England) Ltd. which may be of interest. They have only sent one set. They… | ||
| 05-page333 | Assessment of Marelli magnetos, noting their robust construction, unique contact breaker, and use in other vehicles. | ||
| View original record | no one can see these Sheets except those you choose X.430. ROLLS-ROYCE LTD. INSTRUCTIONS. To: E. &. C. Date: 28 - 4 - 1925 Order No.: W B 10 Supplier's No.: X430 Marelli Magnetos. These appear to be… | ||
| 05-page334 | Table detailing magneto performance tests according to a new general specification, incorporating automatic advance. | ||
| View original record | H.E.W X430 X.430. TABLE OF MAGNETO PERFORMANCE TO NEW GENERAL SPECIFICATION. (INCORPORATING AUTOMATIC ADVANCE). | Date of Test | MAGNETO Make | MAGNETO Type | MAGNETO No. | (1) Weight (lbs.) > 15 |… | ||
| 05-page335 | The method for testing magneto volt-ampere capacity and calculating the figure of merit. | ||
| View original record | X.430 X2791 MAGNETO TESTS - VOLT AMPERE CAPACITY AND FIGURE OF MERIT. The volt ampere capacity figure can be obtained by observing the open circuit volts and closed circuit amperes of the primary… | ||
| 05-page336 | Table detailing the results of magneto tests, including volt-ampere capacity and figure of merit. | ||
| View original record | MAGNETO TESTS, VOLT AMPERE CAPACITY AND FIGURE OF MERIT. Magneto. Type. No. Volt-ampere capacity. Figure of merit. Watford E06 48919 37.6 2.91 " " 50410 20.8 1.63 " " 73970 33.4 2.67 " " 73972 33.1… | ||
| 05-page337 | Comparison table of magneto tests, detailing volt-ampere capacity and figure of merit. | ||
| View original record | MAGNETO TESTS, VOLT AMPERE CAPACITY AND FIGURE OF MERIT. Magneto. | Type. | No. | Volt-ampere capacity | Figure of merit. ---|---|---|---|--- American Bosch. | B.6. | 3002650 | 53.3 | 4.84 American… | ||
| 05-page338 | Comparison table of magneto tests showing volt-ampere capacity and figure of merit. | ||
| View original record | Chassis magnetos MAGNETO TESTS - VOLT AMPERE CAPACITY AND FIGURE OF MERIT. Magneto. | Type. | No. | Volt-ampere capacity. | Figure of merit. Scintilla | GN6 | 57927 | 20.0 | 1.45 " | AM6A | 34937 |… | ||
| 05-page339 | Test results table for chassis magnetos, comparing volt-ampere capacity and figure of merit. | ||
| View original record | Chassis magnetos. MAGNETO TESTS - VOLT AMPERE CAPACITY AND FIGURE OF MERIT. Magneto., Type., No., Volt-ampere capacity., Figure of merit. Lucas, EBA6, 156, 35.3, 2.88 ", ER6, 53, 36.25, 2.73 ", ", 54,… | ||
| 05-page340 | Test report comparing the volt-ampere capacity and figure of merit for various aero magnetos. | ||
| View original record | Aero magnetos. MAGNETO TESTS - VOLT AMPERE CAPACITY AND FIGURE OF MERIT. Magneto. | Type. | No. | Volt-ampere capacity. | Figure of merit. Dixie | 648 | 718237 | 19.45 | 1.39 B.T.H | SC12-7 | 737191 |… | ||
| 05-page341 | Test procedure outlining the steps for demagnetising tests on a magneto. | ||
| View original record | X. 430 27.4.25. DEMAGNETISING TESTS ON MAGNETO. (1) O.C. volts at 1600 r.p.m. (2) O.C. " " 2500 " (3) C.C. Amperes at 1600 (5 mins). (4) C.C. Amperes at 2500 (5 mins). (5) O.S. volts at 1600 r.p.m.… | ||
| 05-page342 | The test procedure for determining the volt-ampere capacity and figure of merit of magnetos. | ||
| View original record | E.Y.C X430 21.4.2.5. MAGNETO TESTS - VOLT AMPERE CAPACITY AND FIGURE OF MERIT. The volt ampere capacity figure can be obtained by observing the open circuit volts and closed circuit amperes of the… | ||
| 05-page343 | Table of test results for various magnetos, showing their volt-ampere capacity and figure of merit. | ||
| View original record | MAGNETO TESTS - VOLT AMPERE CAPACITY AND FIGURE OF MERIT. Table Contents: Column Headers: Magneto, Type, No., Volt-ampere capacity, Figure of merit. Row 1: Watford, E06, 48919, 37.6, 2.91 Row 2:… | ||
| 05-page344 | Comparison table of magneto tests showing volt-ampere capacity and figure of merit for various manufacturers. | ||
| View original record | MAGNETO TESTS - VOLT AMPERE CAPACITY AND FIGURE OF MERIT. Magneto. | Type. | No. | Volt-ampere capacity. | Figure of merit. ----------------------------------------------------------------------… | ||
| 05-page345 | Test results report for various magnetos against general specifications, without automatic advance. | ||
| View original record | X430. MAGNETO TESTS TO GENERAL SPECIFICATION. (NO AUTOMATIC ADVANCE) | Date. | Magneto. | Type. | (1) Weight (LBS). | (2) H.T. gap (mm). +4-8.5 | (3) Firing range +/- 2.5º | (4) (a) (b) (c) | (5)… | ||
| 05-page346 | Table of results of magneto performances. | ||
| View original record | X.430. X.430. TABLE OF RESULTS OF MAGNETO PERFORMANCES 4.1.26. (To new schedule dated 29.8.24.) Date of Test. | MAGNETO Make. | MAGNETO Type. | No. | (1) Weight (lbs) | (3) Safety gap. (MM.) | (4)… | ||
| 05-page347 | Tabular report on performance and noise level tests for various speed ranges. | ||
| View original record | -la- (11a) Speed range: R.P.M. (12) Speed R.P.M. (13) Lowest speeds for 5.5 mm. gaps (R.P.M.) (Sub-headings: Adv., Central, Retard.) (14) Secondary m.a. on 108 Volts 30~ (Sub-headings: Max., Min.)… | ||
| 05-page348 | Table of results from performance tests conducted on various magnetos. | ||
| View original record | X430 X.430 - TABLE OF RESULTS OF MAGNETO PERFORMANCES (To new schedule, dated 2.9.24) | Date of Test. | MAGNETO. Make. Type. No. | (1) Weight (lbs). | (3) Safety gap. (mms) | (4) Platinum gap. | (5)… | ||
| 05-page349 | Test data table comparing magneto performance at various speeds, including voltage output and noise levels. | ||
| View original record | -2- (11a) Speed range. R.P.M. | (12) Speed R.P.M. | (13) Lowest speeds for 5.5 mm. gaps. | (14) Secondary e.m.f. on ICS volts | (15) | (6) Remarks re silence. - | - | Adv. Central. Retard. | Max. Min.… | ||
| 05-page350 | Modifications to the New Phantom magneto and a related ignition fault. | ||
| View original record | To Hs. from R. c. to CH. c. BY. ----------------- X8790 RB/M25.8.25. NEW PHANTOM MAGNETO. X.8790. X.4181d. It will be remembered that it was suggested here that the friction on the magneto should be… | ||
| 05-page351 | Negotiations for magnetos for EAC chassis and clarifying the required specifications. | ||
| View original record | To Wd. from EPC. X8790 EFC3/T26.8.25. X.8790. RE MAGNETOS FOR EAC. X.3209 Further to our EFC2/T26.8.25, there have also been negotiations with the M.L. and Lucas Companies with regard to magnetos for… | ||
| 05-page352 | Copy of a letter from The M.L. Magneto Synd. Ltd. regarding modifications to a six-cylinder magneto. | ||
| View original record | X8790 COPY OF LETTER RECEIVED FROM:- THE M.L. MAGNETO SYND. LTD., VICTORIA WORKS, COVENTRY. EFC5/T. FAW/EE. October 29th, 1924. Messrs. Rolls-Royce Ltd., DERBY. Attention of Mr. Fowler Clark. X8209… | ||
| 05-page353 | Graph of open circuit volt-speed and short circuit ampere-speed curves for B.T.H. and Watford magnetos. | ||
| View original record | K8722 WATFORD EQL4 No 73470 VOLTS B.T.H. NO 206071 B.T.H. NO 35047 AMPERES OPEN CIRCUIT VOLT-SPEED AND SHORT CIRCUIT AMPERE-SPEED CURVES OF PRIMARY WINDINGS OF B.T.H. PM6 AND WATFORD EQL 4 MAGNETOS… | ||
| 05-page354 | Magnetos without automatic advance for the New Phantom chassis. | ||
| View original record | R.R. 40M 10-24 R. & S. D. 23. 11-24-1M. (M.L.) EXPERIMENTAL REPORT 18790 Exptl. No. 8790. REF: EHD/TS.12.25. To R. from EPC. c.c. E. W. c.c. By. Ds. c.c. NG. MAGNETOS WITHOUT AUTOMATIC ADVANCE FOR NEW… | ||
| 05-page355 | Comparing the bench test results, design, weight, and price of B.T.H. magnetos against a standard Watford machine. | ||
| View original record | R.R.455a (R) R.R.D.M. 55. 1-2-23 J.R.C. -2- EXPERIMENTAL REPORT. Contd. Expl. No. REF: EPCG/TB 12.25. The following are the comparative results of bench tests of these two B.T.H. magnetos… | ||
| 05-page356 | Comparing the specifications and performance of Watford and B.T.H. magnetos. | ||
| View original record | R.R. co. Ltd. Derby (M. of A. (Tech.) J.M.D. EXPERIMENTAL REPORT. Contd. -3- Expl. No. REF. WDM/CRS 12.12.25. (3) The H.T. safety gaps in the two magnetos are:- Watford 8.5 mm. B.T.H. 7.8 mm. In… | ||
| 05-page357 | Page detailing endurance, circuit, and utility tests on two magnetos. | ||
| View original record | R.R. AERO COPY 12-12-25. 13-40 J.W.D. EXPERIMENTAL REPORT. Contd. -4- Expl. No. REF AFU1/T8.12.25. (6) Endurance tests carried out on the two machines in which they were run for 7 hours at 2000 r.p.m.… | ||
| 05-page358 | Continuation detailing magneto spark gap and utility tests. | ||
| View original record | R.R. 405s 1M-11-25. H. & S., Ltd. Gp. 104-5-8 G.M.S. -8- EXPERIMENTAL REPORT Contd. Exptl. No. REF.EPCI/TB.12.25. (a) Nothing connected across. (b) The secondaries of two Remy coils in series… | ||
| 05-page359 | Comparing the high and low-speed sparking characteristics of different magnetos. | ||
| View original record | E.R. 4084 (30) M.N. 17-9-25. 1.M. EXPERIMENTAL REPORT. Contd. -6- Expt. No. REFER/T8.12.25. (12) High Speed Sparking Characteristics. The highest speed at which the magnetos were capable of firing… | ||
| 05-page360 | Continued experimental report on steering column backlash, with a later note on magneto noise comparison. | ||
| View original record | R.R. Std. OH/CD-173. Ed. 10-23. 1000. EXPERIMENTAL REPORT Contd. " " Expl. No. REF:FCM/10.12.25. steering column. This will reduce the rate of development of backlash in the linkage system, and… | ||
| 05-page361 | Curve showing the variation of DC volts with the position of a hand lever on a cam for a B.T.H. Magneto Type FM6. | ||
| View original record | B.T.H. MAGNETO TYPE FM6 No 356071 CURVE SHOWING VARIATION OF D.C. VOLTS WITH POSITION OF HAND LEVER ON CAM NOTE. SLEEVES RIGIDLY FIXED TO LEVER. VOLTS. (SPEED 200 R.P.M.) POSITION OF MAXIMUM FLUX… | ||
| 05-page362 | Curve showing the variation of D.C. volts with cam lever position for a Watford Edge Magneto No. 7947C. | ||
| View original record | WATFORD EDge MAGNETO No 7947C CURVE SHOWING VARIATION OF D.C. VOLTS WITH CAM LEVER POSITION. NOTE. SLEEVES RIGIDLY CONNECTED TO LEVER. Y-Axis Label: VOLTS X-Axis Label: LEVER POSITION. X-Axis… | ||
| 05-page363 | Cross-reference note for information on chassis magnetos. | ||
| View original record | X.430. 31.12.30. For further matter relating to Chassis magnetos (general) see X.6098. | ||