Rolls-Royce Archives
| Identifier | Entry | ||
| Scan2 | Page of calculations and analysis regarding moments of inertia and out-of-balance connecting rod couples. | ||
| View original record | EFC1/T:6.10.24. -16- Contd. M_x - M_X = (k^2 + ab)/(a(a-b)) M = b/(a-b) M_g at X and M_p - M_P = (k^2 + ab)/(b(a-b)) M = -a/(a-b) M_g at P which moment of inertia is (M_x - M_X) a^2 + (M_p - M_P) b^2… | ||
| Scan3 | Page of calculations for engine connecting rod balancing, considering centre of mass and moment of inertia. | ||
| View original record | Contd. -15- EFCL /T6.10.24. The centre of mass G of the con. rod is in the line XP and at a distance b beyond P and the division of the total mass for the purpose of complete linear balance is such… | ||
| Scan4 | Page discussing the principles of balancing engine mass, including an out-of-balance couple formula and diagram. | ||
| View original record | EFC1/T6.10.2 4 -14- Contd. (b) In the (b) case the equi-momental system of three massive particles breaks down (because two of them become infinite), but it is not needed. It is clear from principles… | ||
| Scan5 | Page discussing the unbalanced moment of inertia and linear out-of-balance using mathematical formulas. | ||
| View original record | EFCl/T6.10.24. -13- Contd. This couple can be looked upon as that due to the unbalanced moment of inertia about G of masses Mₓ - Mx = (k² - ab)/(a(a + b)) M = - b/(a + b) Mg at X and Mₚ - Mp = (k² -… | ||
| Scan6 | Page from a paper analyzing unusual cases in the mechanics of a connecting rod and linear balancing. | ||
| View original record | EFC1/T6.10.24. -12- Contd. (7) For completeness three further (unusual) cases will be considered :- (a) That in which the centre of mass G of the con. rod is nearer to P than previously considered, so… | ||
| Scan7 | Page analysing connecting rod dynamics using the principles of a reversible compound pendulum. | ||
| View original record | Contd. -11- It therefore appears desirable to arrange for this condition as nearly as is convenient in other respects. This makes the con. rod proportionately heavier at the big end than usual. ab is… | ||
| Scan8 | Technical analysis of the out-of-balance forces and couples in a connecting rod system. | ||
| View original record | -9- Contd. showing that when complete linear balance has been effected, the transverse out-of-balance con. rod couple is not Mk²Ø̈ as might perhaps be thought, but M (a b - k²) Ø̈ and is, if ab is… | ||
| Scan9 | Page of calculations regarding the moment of inertia and linear balance of a connecting rod. | ||
| View original record | EFCL/T6.10.24. -8a- Contd. through a distance b, this moment of inertia being accelerated with the actual angular acceleration of the connecting rod. This should be clear by consideration of the fact… | ||
| Scan10 | Page from a technical paper on the linear balancing of a connecting rod. | ||
| View original record | EFC1/T6.10.24. -8- Contd. is generally (the exception in certain circumstances being indicated later) in the opposite direction to the couple, due to the acceleration of the con. rod itself about its… | ||
| Scan11 | Page of calculations and notes regarding linear balance and transverse couples in connecting rods. | ||
| View original record | -7- Contd. Note:- It will be seen that Mx actually at X plus the contribution b ------ Mg of Mg. (see p.5 top) a + b add together to give the usual fraction b ------ M of M a + b considered at the… | ||
| Scan12 | Page discussing the principles of transverse couple balancing for a connecting rod's mass and the resulting out-of-balance couple. | ||
| View original record | Contd. -6- There is only, then, to consider, as regards transverse couple balancing, the mass Mg at the centre of mass of the con rod, though as regards linear balance this has to be considered… | ||
| Scan13 | Page detailing the formulas for an equi-momental system representing a connecting rod's mass distribution and dynamics. | ||
| View original record | -5- Contd. Mx = (k^2 / a(a + b)) M at the crosshead. Mp = (k^2 / b(a + b)) M at the crankpin. Mg = (a b - k^2 / a b) M at the centre of mass. where a and b are the respective distances XG and GP… | ||
| Scan14 | Theoretical analysis of the dynamics of a connecting rod using an equi-momental system. | ||
| View original record | -4- Contd. with the subject, however, is considered to be more confusing than the one to which we proceed below. (5) It is considered that the dynamics of the con. rod can be more readily appreciated… | ||
| Scan15 | Page discussing the linear and angular accelerations of a connecting rod for engine balancing. | ||
| View original record | -3- Contd. because by supplying these effective forces by the inertia actions of other moving masses, we balance the body. (4) The linear accelerations of the centre of mass of a con. rod in the… | ||
| Scan16 | Page from a document explaining the principles of motion and the concept of 'Effective Forces' in dynamics. | ||
| View original record | -2- Contd. (a) The motion of the centre of mass is precisely the same as it would be if the mass of the whole body were collected into a particle at the centre of mass and all the forces applied to… | ||
| Scan17 | The dynamics and balancing of connecting rods. | ||
| View original record | EFCl/T6.10.24. ORIGINAL CONNECTING ROD DYNAMICS. PART I. BALANCING. (1) Whereas the balancing of the purely reciprocating and of the purely revolving parts of engines, inclusive of the respective… | ||
| Scan21 | Bump tests for road springs comparing different cam settings. | ||
| View original record | R.R. 493a (20H) (D.A. 652 20-3-24) J.B.D. EXPERIMENTAL REPORT. Expl. No. REF: HsS/LCS.10.24. XB31 BUMP TESTS ON ROAD SPRINGS. X2628 To R. from Hs. c. to CJ. BJ. c. to E. DA. c. to EY. Wor. ✓ We have… | ||
| Scan22 | Bump test for front springs, comparing the effect of different cam positions on time to failure. | ||
| View original record | H.R & R BUMP TEST (FRONT SPRINGS) - EFFECT OF CAM POSITION SIDE TO SIDE RELATIONSHIP & TIME TO FAILURE EXPERIMENTAL REPORT TO S. work/HA C.B. LO OF J AG. H OF O BUMP TEST ON EACH NO 4C25X, SPRING We… | ||
| Scan24 | Instructions requested for spring types on cars 9-PK and 98-NK for testing in France. | ||
| View original record | contd :- -2- The Expl: Dept: would like definite instructions in connection with the following points :- (1) Is the car (9-PK) which is commencing the 10,000 miles test in France to run with Woodhead… | ||
| Scan25 | Testing of Woodhead and Firths springs of varying stiffness in France. | ||
| View original record | To R, from HS. c. to CJ. BJ. c. to M. DA. c. to BY. Wor. ✓ SECRET. Hs4/LGS.10.24. TESTING SPRINGS IN FRANCE. Y9941 X2628 29410 BY: M, and DA, have approved of the Woodhead latest springs. Sets of… | ||
| Scan26 | Querying the correct buffer clearance to be used for 20% and 12½% springs. | ||
| View original record | To DA. from Hs. c. to BY. ORIGINAL Hs7/LG6.10.24. BUFFER CLEARANCE. V2628 x9410 When I was at WW. I was under the impression that the same buffers were used for the 20% and the 12½% springs. According… | ||
| Scan27 | Query regarding a claim of constant leverage for four-wheel brakes made in an attached pamphlet. | ||
| View original record | To DA. from Hs. ORIGINAL Hs3/LG7.10.24. FOUR WHEEL BRAKES. X9940 We should like to draw your attention to Paragraph 11. in the attached pamphlet. Do you consider this correct? We do not see how we can… | ||
| Scan30 | The specifications for a car for 'W.W.', requiring good weather protection and a well-proportioned body. | ||
| View original record | TO HS. FROM R. Copy to RJ. [Struck through] ORIGINAL [Stamp] R2/M9. 10. 24. CAR FOR WW. X4219 [Handwritten and crossed out] It seems necessary to have a car with good weather protection, at least… | ||
| Scan33 | Technical drawing of the Eagle IX revised induction system. | ||
| View original record | EAGLE IX REVISED INDUCTION SYSTEM CAST ALUMINIUM JACKETED UPTAKE & ELBOW STEEL LINKS HORIZONTAL STEEL SUPPORT ALUMINIUM BOX BRACKET PETROL FILTER REINSTATED ACCESSIBLE THRU STEEL SUPPORT HORIZONTAL… | ||
| Scan35 | Proposing modifications and tests for the EAC.11 car, focusing on a fabric type coupling and a sub-frame scheme. | ||
| View original record | R.R. 491A (2011) (D.A. 652 20-3-24) J.H.D. EXPERIMENTAL REPORT. ORIGINAL Expl. No. REF: Hs5/IMB.10.24. To R. from Hs. c. to CJ. BJ. c. to E. DA. c. to HY. Nor. S E C R E T. E.A.C.11 X8770 48380 We… | ||
| Scan37 | Bump test report for Woodhead 12.5% type leaf springs, detailing conditions, fracture analysis, and material properties. | ||
| View original record | BUMP TEST Re. 40/50 FRONT SPRINGS. TEST OF LATEST PATTERN WOODHEAD 12.5% TYPE SPRINGS (F71790/1/2). CONDITIONS: 2" CAMS SET AT 180°. DRUM MAKES 105 RPM. TYRES AT 65 LBS/SQ". LOAD ON FRONT OF CHASSIS =… | ||
| Scan40 | Bump test report for Woodhead 12 1/2% type front springs. | ||
| View original record | BUMP TEST. Re: 40/50 FRONT SPRINGS TEST OF LATEST PATTERN WOODHEAD 12 1/2 % TYPE SPRINGS (FT1740/1). CONDITIONS: 2" CAMS SET AT 180°. DRUM MAKES 105 R.P.M. TYRES AT 65 LBS/SQ". LOAD ON FRONT OF… | ||
| Scan41 | The comparison and testing of various ignition coils, including mileage summaries. | ||
| View original record | Contd. -4- EFCl/T14.10.24. TR.6. This coil was also received at the same time as TR.4 above, and satisfactorily underwent the production test. On 19.6.24, it was sent to R. for 6-EX. In a note to E.… | ||
| Scan42 | Continued thrashing, bench, and mileage tests on coils TR.3, TR.4, and TR.5. | ||
| View original record | Contd. -3- EFCL/T14.10.24. TR.3. This coil was received at the same time as TR.2. above. As in the case of TR2 it was not previously put through the production test, but was placed on 7-GII when TR2… | ||
| Scan43 | The testing and performance of various ignition coils, including redmanol and stabalite types, on different chassis. | ||
| View original record | Contd. -2- EFCl/T14.10.24. The coil was removed from 7-GII on 7.2.24 having done 2370 miles. On 9.4.24 it was placed on chassis 3-GII and ran satisfactorily on this chassis for 3952 miles (total… | ||
| Scan44 | Tall battery ignition coils in Redmanol cases. | ||
| View original record | ORIGINAL To R & E. from EFC. c. CJ. & PN. c. Ey. Wor. c. Da. EP. EFC1/T14.10.24. X.4079b. TALL BATTERY IGNITION COILS IN REDMANOL CASES. All the Redmanol encased coils dealt with in this report are… | ||
| Scan45 | Further notes and test results for a Lithanode Battery. | ||
| View original record | Contd. -10- EFC1/T17.10.24. Further notes re Lithanode Battery. Further tests of this battery recently completed have shown considerable improvement and my assistant's report JB.59 is as follows :-… | ||
| Scan46 | Comparison of performance data and discharge capacity results for various battery models. | ||
| View original record | Contd. -9-7 EFCL/T17.10.24. more particularly with the Exide 6BXRE5 batteries, and either of the two should give excellent service. They are precisely in accordance with our up-to-date specification… | ||
| Scan47 | Continued report discussing the suitability and comparison of various car batteries. | ||
| View original record | Contd. -8- EFC1/T.1.10.24. This battery is not of suitable dimensions for being placed in our standard battery box on the car, but on account of the good results Messrs. Fullers have been commun-… | ||
| Scan48 | Report page detailing the performance and faults of various batteries under testing, with a specific focus on a Fuller Sparta model. | ||
| View original record | Contd. -7- EFCl/T17.10.24. The preliminary high and low rate bench discharge results of this battery have not been particularly good, but it is expected to improve with use. It is now on our bench… | ||
| Scan49 | Comparison of Accu-Slem, Exide, and Lithanode batteries, detailing construction, paste, and weight. | ||
| View original record | Contd. -6- EFCL/T11.10.24. (1) Ebonite separators in addition to wood. (2) Central stay bolt and packing pieces to afford better support to individual cells. (3) Feet on plate grids. (4) Larger wood… | ||
| Scan50 | The testing and comparison of Accu-Slem and Exide batteries on various cars. | ||
| View original record | Contd. -5- EFCL/T14.10.24. the P & R Co. respectively, so that they could see for themselves what was put into the cells which had given such good results in our hands. Shortly afterwards we received… | ||
| Scan51 | The condition and performance testing of Exide and Accu-Slem battery cells. | ||
| View original record | Contd. -4- EFCL/T11.10.24. Low rate and high rate discharge results again taken showed the battery still to be in excellent condition, though on the School car the battery would have been subjected… | ||
| Scan52 | The testing and performance of an Accu-Slem Battery compared to a standard Exide battery. | ||
| View original record | Contd. -3- EFC1/T11.10.24. Accu-Slem Battery. We have had several of these batteries and with the exception of cells which we have specially opened up for examination, practically all are still… | ||
| Scan53 | Battery life experiments and performance for Exide and P & R models. | ||
| View original record | Contd. -2- EFC1/T11.10.24. Exide 6BXFE5/SPL. As an experiment on the possible prolongation of the life of the plates of this battery, we got the Exide Co. to make up three batteries precisely similar… | ||
| Scan54 | The development and performance of the Exide 6BXRE5 battery for the 40/50 chassis. | ||
| View original record | To R & E. from EFC. c. CJ. & PN. c. Wor. Wd. c. Ev. EP. c. Da. X.664 - BATTERIES FOR 40/50 CHASSIS. Exide 6BXRE5 (Standard until recently). This refers to the final form (complete with all… | ||
| Scan56 | Graph of continuous high-rate discharge curves for various batteries over time. | ||
| View original record | 40-50 H.P. SITE CHASSIS 'P' CONTINUOUS HIGH RATE DISCHARGE CURVES TAKEN AT RESEARCH DRAWING NO. INK BATTERIES:- 85, 95, 105, 116, 117, 120, 133, 139, 146, 147 AMPERES OR TEN TIMES TERMINAL VOLTS TIME… | ||
| Scan57 | Specifications for car battery construction, components, and maintenance considerations. | ||
| View original record | -5- (14) SEPARATORS. The material and thickness of the separators should be such as absolutely to prevent any possibility of short circuits from plate to plate during the life of the battery. Ribbed… | ||
| Scan58 | Specifications for battery sealing compound and plate grid design. | ||
| View original record | -4- Contd. (12) SEALING COMPOUND. The cells should be sealed over their tops only, with the exception that the sealing compound should be allowed to run down between the centre cells where the bicycle… | ||
| Scan59 | Specifications for battery cell construction, layout, and connections, including a sketch plan. | ||
| View original record | -3- Contd. (9) INDIVIDUAL CELLS. Each cell will be a complete unit in itself so that there is absolutely no possibility of internal cell to cell leakage. (10) DISPOSITION OF CELLS IN THE BATTERY. This… | ||
| Scan60 | Specifications for battery case, weight, and dimensions. | ||
| View original record | EFCl/T8.3.24. -2- Contd. of the battery to afford support to the sides of the case. The material of the case should be wood of the most suitable variety, treated in such a manner as to minimise the… | ||
| Scan61 | Specification for a 12-volt chassis lighting and starting battery for a 40/50 HP vehicle. | ||
| View original record | SPECIFICATION No. 301 OF RR. 40/50 HP. CHASSIS LIGHTING & STARTING BATTERY (12 VOLT). (1) CAPACITY OF BATTERY. The ampere hour discharge capacity (actual) of the battery at the 10 hour rate should be… | ||
| Scan62 | Preliminary notes of interest on the Fuller Sparta ORV12/CS battery. | ||
| View original record | COPY. 18.10.24. .69. PRELIMINARY NOTES OF INTEREST ON FULLER SPARTA BATTERY ORV12/CS. Material of cell boxes. Not known. Case for battery. Complies with specification except in one respect, viz. that… | ||
| Scan64 | The preparation of the 98-NK car for a 10,000-mile test in France, focusing on new front springs, radiator, and tyres. | ||
| View original record | R.R. 403a (20H) (D.A. 853 20-3-24) J.R.D. ORIGINAL Expl. No. REF: Hs2/LG20.10.24. EXPERIMENTAL REPORT. To R. from Hs. c. to CJ. BJ. c. to E. Da. c. to EY. Wor. 10,000 MILES TEST IN FRANCE. 49941 49410… | ||
| Scan65 | Continued technical assessment of a battery's construction, components, and suitability. | ||
| View original record | Contd. -2- It will be seen that it is much too wide to go in the standard battery box. (9) Each cell is a unit in itself. (10) Disposition of cells in the battery. Complies with this item O.K. (11)… | ||
| Scan66 | Summary notes of interest on a Lithanode 78-Ampere Hour battery, comparing its specifications against requirements. | ||
| View original record | RFC. COPY. 7.4.24. JB.41. SUMMARY NOTES OF INTEREST ON LITHANODE 78-AMPERE HOUR BATTERY (116). Re further to our report JB. 31 20.12.23. the following are points in which it differs from our… | ||
| Scan67 | The examination and comparison of an Accu-Slem battery with an Exide battery. | ||
| View original record | KP/S. 6th December, 1923. Re Accu-Slem Battery from Rolls-Royce. I have read Mr. Fowler Clark's very interesting report on the above, dated 1.11.23, and have examined the cell taken from the battery… | ||
| Scan68 | Summary of seven improvements made to the Exide Battery compared to the previous standard. | ||
| View original record | To R. & E. Extract from:- EPC3/17.3.21 RE BATTERIES. " Exide Battery. This battery has the following improvements as compared with our present standard, which, you may remember, already has perforated… | ||
| Scan69 | Comparison of electric force in concentric sphere and cylindrical gaps using mathematical 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… | ||
| Scan70 | Analysis of annular spark gap design, focusing on wire-to-hole diameter ratios to prevent brush discharge. | ||
| View original record | Contd. -4- EFC1/T16.7.34. 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 1/e = .368, in order to prevent the… | ||
| Scan71 | Page discussing the principles of electric force and potential difference in relation to wire and cylinder conductors. | ||
| View original record | Contd. -3- The two effects balance one another if d/da (a log_e b/a) is zero. This is the case if -1 + log_e b/a = 0 if log_e b/a = 1 i.e. if b/a = e b = e a or a = (1/e) b It is clear therefore that… | ||
| Scan72 | Page of calculations and explanations regarding the electric potential and force between a central wire and an outer conducting cylinder. | ||
| View original record | EFCl/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 - ∫(from… | ||
| Scan73 | Technical paper on the advantages and physics of the annular spark gap. | ||
| View original record | COPY. EFCl/T16.7.24. 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… | ||
| Scan76 | Modifications to batteries, specifically regarding the sealing of cells and weight reduction. | ||
| View original record | EFC3/T7.3.21. -2- Contd. sort of compromise between completely sealing the cells in the case and having the cells quite separate as before and still is supposed to allow of the possibility of removing… | ||
| Scan81 | Continued list of specifications for various components including contact breakers, magnetos, and switchboxes. | ||
| View original record | contd :- -3- Hs2/LG20.10.24. from U.S.A. and the whole a impregnated with pure paraffin wax of melting point 125°F. 4. Contact breaker fitted with bone grey fibre. 5. Watford EO6 Magneto No.73983… | ||
| Scan82 | Performance specifications for a magneto's firing capability, timing, and operational silence. | ||
| View original record | -3- Contd. (6) The magneto shall be c-apable 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… | ||
| Scan83 | Series of test procedures for a magneto, including endurance, circuit, and utility spark 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… | ||
| Scan84 | Performance specification for a six-cylinder magneto with automatic advance for the BR. 40/50 car, version 2. | ||
| View original record | SPECIFICATION OF PERFORMANCE OF SIX-CYLINDER MAGNETO ( WITH AUTOMATIC ADVANCE ) FOR BR. 40/50 CAR. VERSION 2. (1) The weight of the magneto complete with automatic advance mechanism but otherwise… | ||
| Scan85 | Magneto performance, standardizing test gaps, and comparing different magneto models. | ||
| View original record | Contd. -4- EPC3/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… | ||
| Scan86 | Table of measurements and observations for different annular gaps, detailing spindle and hole diameters and the resulting coronal discharge. | ||
| View original record | - 32 - 8.10.24. X.4645. ANNULAR GAPS. | 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. |… | ||
| Scan87 | Analysis of electrostatic principles regarding annular gaps to prevent spark-over, including tests on Lucas electrode sets. | ||
| View original record | Contd. -3- EFCS/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… | ||
| Scan88 | Experiments to standardize a leak for testing magneto performance, simulating faulty spark plugs. | ||
| 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… | ||
| Scan89 | Performance and experimental testing of 6-cylinder magnetos and annular spark gaps for the 40/50 Car. | ||
| View original record | To R. & E. from EFC. c. CJ. & FN. c. Wor. Hy. EP. c. Da. Hs. RE MAGNETOS. V8790 x 4645 Following the formulation of our Specification of Performance of 6-cylinder Magneto (with automatic advance) for… | ||
| Scan93 | The performance of car 5-G-11, detailing issues with high-speed vibration and steering with balloon tyres. | ||
| View original record | R.R. 493A (20H) (D.A. 652 20-8-24) J.H.D. ORIGINAL EXPERIMENTAL REPORT. Expl. No. 4221 (4219 crossed out) REF: Hs3/LG20.10.24. To R. from Hs. c. to GJ. HJ. c. to E. DA. c. to EY. Wor. 5-G-11 CAR.… | ||
| Scan97 | Announcing the specification for a standardised 20 HP chassis lighting and starting battery. | ||
| View original record | To R & E. from EFC. c. CJ. & PN. c. EP. BY. WOR. c. Da. Wd. 4642 EFC5/T24.10.24. ORIGINAL. X. 4642. STANDARDISED 20 HP. BATTERY. Herewith please find for your reference an up-to-date copy of the… | ||
| Scan98 | Final stages and approval process for production car EAC.11. | ||
| View original record | contd :- -2- This car, when completed should represent as regards performance and quality of running what we can expect from the production EAC.11. We are hoping to have this car ready in 2 weeks… | ||
| Scan100 | Modifying an exhaust manifold for the 40/50 HP engine. | ||
| View original record | R.B. 496A (20H) (D.A. 652 20-3-24) J.B.D. EXPERIMENTAL REPORT. -2- Expl. No. REF Hs2/L929.10.24. exhaust manifold on the 40/50 HP. and making it so that the exhaust from No.1. cylinder can get away… | ||
| Scan103 | Improved method for timing the magneto and a proposal for a new gauge to set the contact breaker. | ||
| View original record | -2- EXPERIMENTAL REPORT. Expl. No. REF Hs2/LG25.10.24. made however that a tooth on the large gear ring carrying the high tension distributor shall be marked, so that it comes opposite the inspection… | ||
| Scan104 | The adjustment of the magneto contact breaker for 40/50 HP cars. | ||
| View original record | B.R. 498A (50H) (D.A. 662 20-3-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs2/LG25.10.24. To R. from Hs. c. to C.J. B.J. c. to E. BA. c. to HY. Woy.✓ c. to FN. EP. 40/50 HP. MAGNETO ADJUSTMENTS. X… | ||