Rolls-Royce Archives

Rolls-Royce Experimental Archives: Box ExFiles\Box 119\3\        Box Selection

IdentifierEntry
scan0001 On testing an experimental louvered bonnet for the Austrian Alpine Contest.
View original record P30/T6512. M^r Hadin. X55. May 6th. 1913. RE EXPERIMENTAL LOUVRED BONNET. We have tested this on one of the L to E cars with ventilated undershield and open Dashboard, and find that same is an…

scan0002 To Mr Barrington regarding the dispatch of a louvred bonnet to Mr Johnson.
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. DATE. Mr Barrington 31-8-12…

scan0003 Letter requesting tests on different bonnet configurations to assess their effect on engine cooling.
View original record Westwood, Crowborough, Sussex, 31st August 1912. My dear C.J., I shall be glad if you will have tested the difference in the behaviour of a car climbing one of the mountain passes with reference to…

scan0004 Letter detailing the itinerary and mileage for a six-day car journey in Austria.
View original record C. Johnson Esq., 14/15 Conduit Street, London, W. Hotel Bristol, Vienna. July 30th, 1913 Dear Sir, Below I beg to give you our itinerary and mileages for the past six days:- Wed. July 24. Vienna,…

scan0005 Test results for closed and louvred bonnets on Broccone Pass, Austria, detailing water loss and temperature readings.
View original record Mr Barrington. [Handwritten Note] Tests with closed & louvred bonnets on Broccone Pass . taken by Sinclair with 1718 in Austria 17.9.12 TEMPERATURES WITH BOTH SIDE WINDOWS OPEN Ascents Loss of Water…

scan0006 Table recording performance data from two test ascents with different bonnet setups.
View original record 4th asct. closed bonnet plate on. 4 1/2 litrs. 16c 15c 24c 27c 31c 47c 5th asct. Without bonnet plate on No water lost. " temp. 90° 14c 11c 24c 22c 34c 34c R

scan0007 Report from Hives on the design and manufacture of louvred bonnets.
View original record Mr Barrington. RE LOUVRED BONNETS. Hives reports as follows:- "On the road all of the louvres are useful, if anything more air passes out of the front ones than the rear. The louvred bonnets for…

scan0008 Test notes on a louvred bonnet for car 2126, detailing observations on noise and cooling.
View original record X55 Tests taken with 2126 (France) Sunday 20th October 1912 by Mr Maclure. (3) LOUVRED BONNET. The chief point with reference to these seems to be the various noises which stand out i.e. magneto…

scan0009 Letter from F.H. Royce regarding design modifications for the scuttle dashboard shutters on a London-Edinburgh type car.
View original record COPY. W.M. FHR1/H251012. [Stamp: RECEIVED 30 OCT 1912] [Signature: Jn Wormald] Grand Hotel Du Canadel. Par le Lavandou, (VAR) 25th October 1912. Mr Johnson RECEIVED from F.H.R. for T.C. & Mr Spinney.…

scan0010 Hand-drawn diagram illustrating a practical scheme for operating louvres.
View original record A Simple Scheme of louvres & means of operating I found practical. rod over pump Hand Pump Gauges rod under Gauges Push & Pull R & Left by foot about 5 1/2 deep x 1 3/4 wide Small Spherical joints…

scan0011 Departmental memo regarding the ventilation of the dashboard.
View original record R.R. No.6 (50 H) (X 166. 30.11.11) E.P 683. ROLLS-ROYCE LIMITED, 14-15, CONDUIT STREET, LONDON, W. TELEGRAMS: "ROLHEAD," LONDON. TELEPHONES: 1654, 1655, 1656 GERRARD. DEPARTMENTAL MEMO. This column is…

scan0012 The ventilation scheme and bonnet louvre construction for Chassis 2100E.
View original record TBB3/L41212 December 4th 1912. Report on Special Parts fitted to Chassis 2100E. 3. VENTILATION SCHEME :- An open dashboard and louvred side guards and louvred bonnet are fitted. I should like to draw…

scan0013 The ventilation scheme for chassis 2100E, questioning the benefit of fitting louvres.
View original record R.R. 235A (100B) (PP351. 2.1.13) G 4088 EXTRACT FROM FHR1/H181212. Dated 18th. Dec. 1912. RE REPORT ON CHASSIS 2100E. Sheet 3. - VENTILATION SCHEME. Are the louvres a decided advantage? If not, do not…

scan0014 From Mr. Royce with a design recommendation for windows instead of louvres.
View original record Rec. 28/4/13. Mr. Royce Remarks On Urgency Report AW/SM14/L8413. X.274 No louvres but windows, I recommend. Copy

scan0015 Departmental memo regarding an experimental bonnet shutter and a new type of bonnet.
View original record ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. TELEGRAMS: "ROYCAR," DERBY. TELEPHONES: 476 (FOUR LINES). DEPARTMENTAL MEMO. X274 This column is for Name of Person addressed: Mr. Wormald DATE: 28/5/13…

scan0016 Necessity of bonnet louvres, including an extract from Mr Royce's opinion on the matter.
View original record R.R. 235A (150 n) (XX. 140. 18.7.13) E.P. 4635. Wor/SM36/L27813. Re Bonnet.- Test whether louvres are necessary. X.55 Hy 27-8-13. E. The following is an extract from Na.c Mr Royce's memo R3/P21813 :-…

scan0017 Necessity of testing bonnet louvres.
View original record Typed: Bonnet, test whether louvres are necessary. X.55 This experiment has been in the Experimental shop about 10 months. Do you propose to do anything with it or can I write to Mr Royce suggesting…

scan0018 Potential modifications for car number 2127, concerning a shutter bonnet and radiator issues.
View original record R.R. 235a (100H) (LL 354. 3.7.12) G 2699. R9/F 18.10.13. CJ10/GT161013. Re Van Cutson. Car No. 2127. COPY XS5 To J. from R. I have no objection, but why not a shutter bonnet, so that it can be closed…

scan0019 Internal inquiry regarding the engine cooling performance of shuttered bonnets versus louvred bonnets.
View original record R.R. 657. (100H) (XX. 426. 18.9.13) E.P. 4985. ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. TELEGRAMS: "ROYCAR," DERBY. TELEPHONES: 476 (FOUR LINES). U.W. Names and Indicating letter. Initial of…

scan0020 Internal request for test results comparing shuttered and louvered bonnets for engine cooling, with a handwritten reply.
View original record R.R. 657. (100H) (XX. 426. 18.9.13) E.P. 4985. ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY TELEGRAMS: "ROYCAR," DERBY. TELEPHONES: 476 (FOUR LINES). Wor/SM1/L31113. Re Bonnet Ventilation. X.1085 Mr…

scan0021 Request for a report comparing the cooling effects of shuttered versus louvered bonnets.
View original record Wor/SM11/L41113. Re Bonnet Ventilation. X.551085 Pd 4-11-13. for Bullamore. We understand that chassis 1926 was fitted with a shuttered Bonnet. Mr Johnson wishes us to obtain for him some information…

scan0022 Comparative cooling efficiency of shuttered versus louvred bonnets.
View original record R.R. 657. (100H) (XX 996. 23.6.13) E.P. 4502. ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. TELEGRAMS "ROYCAR," DERBY. TELEPHONES : 476 (FOUR LINES). Names and Indicating letter. Initial of person…

scan0023 Comparative cooling efficiency of a shuttered bonnet versus a louvred bonnet.
View original record 235A (150 H) (XX. 530. 8.10.13) E.P. 5156. Wor/SM8/L71113. Re Shuttered Bonnet. X.55 1085 Na 7-11-13. for Mr Southern. In reply to your memo Na/S9/LG 211013, we wish to state that we wrote the Exp.…

scan0024 Cover page for a document concerning Spanish Trials Cars.
View original record R.F. . Wor/SM8/L71113. -2- Spanish Trials Cars dated June 17th.1913. p. Wor. [Watermark] DICKINSON BOND 1804 MADE AT CROXLEY [Footer text, bottom left] K & B 582/ 750M (2Z) 3.10 R.P.L. 396

scan0025 The Experimental Department to report on the cooling efficiency of shuttered bonnets versus louvered types.
View original record R.R. 657. (100H) (VV. 240. 17.12.13) E.P. 5598. ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. F.R. TELEGRAMS: "ROYCAR," DERBY. TELEPHONES: 476 (FOUR LINES). Names and indicating letter. Initial of…

scan0026 Quoting Mr. Hives' report on the comparison between shuttered and louvred bonnets.
View original record Re Shuttered Bonnets. X.1085. Na/s. WOR/Mcr2/021114. 21/1/14. In reply to your memo Na/S16/LG14114, we give below Mr. Hives report:- "We have no results of any comparative tests taken with the…

scan0027 Comparative tests and opinions on shuttered bonnets.
View original record R.R. 657. (100H) (VV.88. 19.11.13) E.P. 5408. ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. TELEGRAMS: "ROYCAR," DERBY. TELEPHONES: 476 (FOUR LINES). Re Shuttered Bonnets. X.1085 Mr Hives. 15-1-14. We…

scan0028 Seeking clarification on a contradictory report about the effectiveness of shuttered bonnets.
View original record ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. TELEGRAMS: "ROYCAR," DERBY. TELEPHONES: 476 (FOUR LINES). Names and indicating letter. Initial of person addressed. A Mr. ADAMS By Mr. BAILEY Bn Mr.…

scan0029 Further tests and a report on a matter previously explained.
View original record X1088- I have already spent a considerable amount of time explaining this matter to the Southians, but as it does not seem to have done much good. I am making a further test & will issue a report in…

scan0030 Quoting Hives' remarks regarding shuttered bonnets and the need for further testing.
View original record Wor/Mcr7/L24114. Re Shuttered Bonnets. X.1085 Na/S 24-1-14. Re your memo Na/S7/LG23114 Mr Hives remarks re same as follows :- "I have already spent a considerable amount "of time explaining this…

scan0031 Internal query regarding the fitting of shuttered bonnets and their heat-transfer effect on floorboards compared to louvred bonnets.
View original record R.R. 657. (100H) (VV 240. 17.12.13) E.P. 5598. ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. TELEGRAMS: "ROYCAR," DERBY. TELEPHONES: 476 (Four Lines). Names and Indicating letter. Initial of person…

scan0032 Effect of shuttered bonnets on the ventilation of floorboards, awaiting test results.
View original record Wor/Mcrl8/L4214. Re Shuttered Bonnet. X.1085 Na. 4-2-14. In reply to your memo Na28/B2214, Mr Hives reports that he cannot make any statement at present re the effect of shuttered Bonnets on the…

scan0033 Follow-up memo requesting a reply to a previous enquiry regarding Shuttered Bonnets.
View original record Copy for Mr.Mercer. X1083- U. Re Shuttered Bonnets. Na/S3/LG5214. 5.2.14. Wor for Mr.Hives. As Mr. Johnson is making enquiries, we shall be glad if you will kindly let us have a reply to our memo…

scan0034 Testing parameters for comparing louvred and shuttered bonnets.
View original record R.R. 637. (100H) (VV 240. 17.12.13) E.P. 5598. ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. TELEGRAMS: "ROYCAR," DERBY. TELEPHONES: 476 (Four Lines). Names and Indicating letter. Initial of person…

scan0035 Temperature tests comparing open and closed bonnet shutters, and plain versus louvred bonnets.
View original record From Exp. Dept. Copies for: J. R. E. Na. Wor/EHS/L11314. March 11th.1914. Re Bonnet Shutters. X.1085 Temperature tests. Comparative tests taken over the same piece of road car driven at the same speed…

scan0036 Comparison test of water and floorboard temperatures between a plain bonnet and a louvered bonnet.
View original record Wor/EH8/L11314. Contd. 2nd test same conditions. Water Temp. Floorboard Temp. Plain Bonnet. 65° 66° 75° 72° 69° 69° 17° 21° 23° 22° 23° 24° Louvred Bonnet. 65 61 69 65 60 61 18 21 22 20 22 21 This…

scan0037 Tests on the cooling efficiency of shuttered versus louvred bonnets.
View original record Wor/Mcr26/L12314. Re tests with Shuttered Bonnets. X.1085 J. 12-3-14. R. We attach herewith Mr Hives report E. on the above experiment, the origin of which Na. was a request from Mr Nadin's department…

scan0038 Trial of a shuttered bonnet to replace the louvred bonnet for better temperature regulation.
View original record ORIGINAL D R3/P 3. 5. 14. To J. from R. Copy to E. Copy to EP. Divus 27.5.14 RECEIVED 6 MAY 1914 BONNETS With reference to shuttered bonnets, as this is not as efficient as the louvred bonnet, I…

scan0039 Instructions for a new bonnet with double shutters to be fitted to an experimental car.
View original record Wor/Mcr11/L28514. Mr Dalley. Na.c. 28-5-14. Mr Hives wishes instructions to be issued for a new bonnet to be made with double shutters, to be fitted to an experimental car. Possibly this could be…

scan0040 The Drawing Office to issue instructions for fitting a universal radiator and shuttered bonnet to a 1926 Experimental chassis.
View original record R.R. 657. (100H) (VV. 771. 26.3.14) E.P. 6273. ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. TELEGRAMS: "ROYCAR," DERBY. TELEPHONES: 476 (Four Lines). Names and Indicating letter. Initial of person…

scan0041 Comparative test between double shuttered bonnets and louvred bonnets.
View original record ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. TELEGRAMS: "ROYCAR," DERBY. TELEPHONES: 476 (FOUR LINES). Wor/Mcrl1/L29614. Names and Indicating letter. Initial of person addressed. A Mr. ADAMS By Mr.…

scan0042 Fitting of louvred bonnets, referencing Mr Royce's aesthetic and noise objections, and comparing test results to shuttered bonnets.
View original record Wor/Mcr10/L29614. Re Louvred Bonnets. X.55 Mr Plumpton, 29-6-14. In reply to your memo Wor/HS12/O 26614 re the suggestion of fitting a louvred Bonnet to Mr Humphrey Roberts' car 2408, we wish to…

scan0043 Cooling effectiveness of different bonnet designs, with a direct quote from Mr. Royce.
View original record -2- was not quite so good as the louvred for keeping the water cool; approximately the average benefit from the shutters being open is 4% whereas the difference between the temperature when plain and…

scan0044 Complaints of overheating floorboards and the proposed trial of a double shuttered bonnet.
View original record R.R. 657. (100H) (WW. 373. 4.6.14.) E.P. 6736. ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. TELEGRAMS: "ROYCAR," DERBY. TELEPHONES: 476 (FOUR LINES). Names and Indicating letter. Initial of person…

scan0045 Floorboard overheating on Lord Herbert Scott's car and a request for a double shuttered bonnet for experimentation.
View original record ROLLS-ROYCE LIMITED, NIGHTINGALE ROAD, DERBY. TELEGRAMS: "ROYCAR," DERBY. TELEPHONES: 476 (Four Lines). WorMcr8/L4714. Re Double Shuttered Bonnet. X.1085 Mr Hives. Mr Matthews. 4-7-14. Mr Platford is…

scan0046 Availability of the only Double Shuttered Bonnet, currently fitted to a car in the Experimental Shop.
View original record Wor/Mcr9/L6714. Re Double Shuttered Bonnet. X.1085 EP. 6-7-14. In reference to your memo EP6/W3714, please note that the only shuttered Bonnet we have in the Experimental Shop is the one fitted to…

scan0047 Use of bonnet shutters to improve cooling for the floor boards and radiator.
View original record R.R. 235a (150 H) (W.W. 529. 2-7-14) G. 0670. COPY. To J. from R. Copy to Wor. Mr. Harlen E.2/7/4 R15/P 17. 7. 14. With reference to the floor boards, I think this matter has been in the hands of the…

scan0048 Compiling extracts from Mr Royce's criticisms regarding the use of louvred bonnets.
View original record Wor/Mcr7/L20714. RE LOUVRED BONNETS. X.55 E. 20-7-14. Na.c. With reference to our conversation that you were unaware that Mr Royce had spoken in a derogatory manner on the use of Louvred Bonnets and…

scan0049 Louvered bonnets making cars run too cool in winter, referencing a comparative test.
View original record Wor/Mcr7/L20714. -2- "louvred bonnet. I consider we are spoiling "the car more by being too cool in winter "even in this district." I notice that copies of most of the above memos were forwarded to…

scan0050 Instructions to cut an experimental aperture in the side bonnet plates for chassis No. 1926 and provide a cover plate.
View original record ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: Order Dept Order No. 535 Customer's No. EXPTL X1085 Re: Please instruct the Works to cut a hole in the near end of each side bonnet plate of chassis No 1926, the…

scan0051 Development and trial of shuttered bonnets, comparing them to louvred bonnets.
View original record Wor/Mcrs/L23714. RE SHUTTERED BONNETS. X.1085 J. 23-7-14. Mr Royce in his memo R15/P 17.7.14 states that we have lately arranged to use 4 shutters instead of 2 as previously, and you have recently…

scan0052 Testing of a bonnet with four shutters to potentially replace the louvred type.
View original record -2- In view of Mr Royce's recent memo we have had a bonnet with 4 shutters rushed through, as 53NA was not available. This is now in the Experimental Dept. and Mr Hives should be able to test same…

scan0053 To Mr Hives regarding an experiment on shuttered bonnets to be carried out quickly.
View original record Wor/Mcr7/L23714. RE SHUTTERED BONNETS. X.1085 23-7-14. Mr Hives. Mr Johnson has insisted that this experiment be carried out quickly. We have written to him explaining the position and promising that…

scan0054 Requesting an opinion on the application of the Shuttered Bonnet to various car types.
View original record Wor/Mcr9/L.24714. RE SHUTTERED BONNET. X.1085 Mr Hives. 24-7-14. In issuing your report on the above, which we hope to receive to-day, Mr Elliott would like you to state whether you think the Bonnet…

scan0055 Requesting final reports on a list of experiments.
View original record X.1085 Wor/Mcr6/L27714. Mr Hives. 27-7-14. We shall be glad to receive final reports on the following experiments to-day without fail. Shuttered Bonnet. X.1085 Universal Bonnet. X.1181 Comparative…

scan0056 Comparative tests of different bonnet types, recommending the four-shuttered bonnet as the new standard to prevent engine overheating.
View original record 884 (180 H) (W.W. 529. 2-7-14) G. 0670. From Exp. Dept. Copies to:- J. R. E. Na. Wor/EH18/B30Z14. 30th July, 1914. Report on Bonnets with 4 Shutters. X.1085. Attached are comparative tests with (1)…

scan0057 Engine and cabin cooling, comparing radiator types and bonnet designs to prevent the car boiling and reduce hot floorboards.
View original record Wor/EH18/B30714. -2- July 30th, 1914 ing in very hot weather, because with all the improvements we can possibly make an ignorant driver will always be able to make the car boil, the driver can make…

scan0058 Proposal for a more accurate method of measuring floor board temperatures using a radiator test rig.
View original record R.R. Wor/EH18/B30714. -3- July 30th 1914. through the cracks in the floor boards, at very high speeds it is enough to lift the floor boards. I suggest we fit up a more accurate method of measuring…

scan0059 Test report comparing water and floor board temperatures for different types of bonnets.
View original record Type of Bonnet. Atmos. temp. Type of Radiator. Start. 1 2 3 4 5 6 7 8 9 10. Water Temperatures. Plain 19°C 20" standard 70° 76° 77° 77° 79° 88° 72° 71° 74° 74° 75°. Two shutters 19°C 20" 70° 74° 75°…

scan0060 The inefficiency of single shutter bonnets and a trial for a new design with shutters at each end.
View original record Wor/Mcr7/L30714. RE SHUTTERED BONNETS. X.1085 J. 30-7-14. R. E. Na. Bonnets having a single shutter on each side were reported on by Mr Hives 11/3/14 and as the tests showed that these were not very…

scan0061 Extract regarding the dynamometer testing and comparison of shuttered, louvred, and standard bonnets.
View original record Wor/Mcr7/L12814. RE SHUTTERED BONNETS. X.1085 Mr Hives. 12-8-14. E. The following is an extract from Na.c. Mr Royce's memo R3/P 31.7.14 :- "The comparison of these with louvred "bonnets and with…

scan0062 Outlining an agreement for the standardisation of double-shuttered bonnets on standard cars.
View original record WOR18/T17814. X1083 RE STANDARDISATION OF DOUBLE SHUTTERED BONNETS FOR STANDARD CARS. ------------------------------------------ E. 17/1/14. Re - E3/G31714. I am in agreement with this standardisation…

scan0063 The standardisation of double shuttered bonnets for standard cars.
View original record COPY. RB/B18814. 18th August 1914. To E. from R. Copy to J. " Wor. " Na. Re Standardisation of double shuttered Bonnets for standard cars. With reference to your memo E3/G31714, re the above subject,…

scan0064 Agreement on the standardisation of four key vehicle components.
View original record Wor24/T101114. E. 10/11/14. I am entirely in agreement with the standardisation, of:- (1). Universal double shuttered bonnet. (2). Universal radiator with grid honeycomb matrix bonded to top and…

scan0065 Value of air shutters and the ergonomic difficulties of opening and closing the bonnets on various car models.
View original record To EH. from R. c. to CJ. c. to DA. c. to BY. c. to EP. c. to EFC. X1085 E2/G3.6.19. RE BONNETS X.3421. X.3499 Some experience should now have been obtained with air shutters on the 40/50 HP. chassis…

scan0066 Design, cost, and effectiveness of radiator shutters for the 40/50 chassis.
View original record C.O.P.Y. X1085 To R. from EH. c. to CJ. c. to Bn. c. to E. c. to Da. X.3456 X.3409 ✔ X.3421.- RE BONNETS FOR 40/50 CHASSIS. The improvement in the cooling of the water with the four shutters open and…

scan0067 Recommendation to alter bonnet stud handles to make lifting the bonnet easier.
View original record Contd. -2- EH1/LH.5.6.19. your suggestion of bringing the stud handles closer together, and we find that it is a distinct improvement both as regards the effort required to lift the bonnet and the…

scan0068 Query regarding the use of bonnet shutters in India to assess whether to discontinue fitting them due to cost and rattling.
View original record [Handwritten top center] X1085 S.F.C. [Typed top right] Hs3/LG21.9.20. To Mr. Kirby - India. from Hs. [Handwritten below] bwt. kkinc. [Handwritten] X.3499 RE - SHUTTERS IN BONNETS. [Handwritten]…

scan0069 Letter from Rolls-Royce of America regarding a request for data on the use of shutters in bonnets.
View original record DyS - G 71020 F.R. Oct. 7, 1920 Mr. Claude Johnson, Managing Director, Rolls-Royce Ltd., London, England. Attention: Mr. Hives. Dear Sir:- Re: Shutters in Bonnets I have received Mr. Hives' request…

scan0070 Letter from Rolls-Royce of America discussing issues with bonnet shutters, recommending they be omitted due to being jammed by paint and rattling.
View original record Cy13 - C 191020 <1085> Oct. 19, 1920 Mr. Claude Johnson, Managing Director, Rolls-Royce Ltd., London, England. Attention: Mr. Hives. Dear Sir:- Re: Shutters in Bonnets In reply to Mr. Hives' memo…

scan0071 Standardisation of chassis parts by the deletion of shutters in the bonnet.
View original record STANDARDISATION of CHASSIS PARTS. Description of Parts: Deletion of shutters in Bonnet. Origin: Because the shutters are practically never used. Experimental Test Report: The difference in temperature…

scan0072 From Rolls-Royce of America discussing the issues with bonnet shutters and recommending their omission.
View original record X1085 Qy13/G - 19.10.20. Oct. 19. 1920. Mr. Claude Johnson, Managing Director. Rolls-Royce Ltd., London, England. Attention: Mr. Hives. Dear Sirs, Re: Shutters in Bonnets. In reply to Mr. Hives' memo…

scan0073 From Delhi regarding the low number of cars fitted with bonnet shutters.
View original record Y3499 RECEIVED 16 NOV 1920 ROLLS-ROYCE LTD. X1095 SERVICE DEPÔT KASHMIRI GATE DELHI. H8 1 18 1920 LK1/Bsl/le.20. RECEIVED Messrs. Rolls - Royce Ltd: D E R B Y. RE - SHUTTERS IN BONNETS. There are only…

scan0074 Cover note for an attached letter from America regarding shutters in bonnets.
View original record EWT. to Hs. Hs. X1085. EWT/HJC3/G29.10.20. Re: Shutters in Bonnets. -------------------- Attached hereto, for your information, is copy of letter ref: Oy8-G.71020 addressed to CJ. from America. Hs NOV…

scan0075 Recommendation to delete shutters in bonnets due to infrequent use, rattling, and to improve appearance and save costs.
View original record Hs1/G2.11.20. SHUTTERS IN BONNETS. We are recommending that we delete the shutters in Bonnets. We have made enquiries from all our Service Stations and Repair Depots and find that the shutters are…

scan0076 Extracting a report from Australia concerning bonnet rattles and the suitability of louvred bonnets for post-war cars.
View original record X55 Hs. c. to BY. c. to Wor. EP/Thn6/H17.8.21. X.1277 X.55 RE BONNET RATTLES. X.3421 We give below an extract from a report we have received from Mr. Feat, Australia in regard to the above and also in…

scan0077 Decision to retain ventilating shutters on bonnets for cars destined for hot countries.
View original record x7085 A.T. AT ~~DY.~~ from EP. c. to Hs. ~~e.~~ to Sg. EP/Thn11/H10.11.21. x3421 Re. VENTILATING SHUTTERS IN BONNETS. As you are aware, it was recently decided in cases where polished bonnets were…

scan0078 The necessity of ventilation shutters on chassis bonnets for post-war cars used in India.
View original record COPY. X1085 DERBY. c. to Sg. London. Bombay. Whr6/A15.10.21. With reference to your request some time ago for our opinion as to whether the Ventilation Shutters on Chassis Bonnets were necessary,…

scan0079 If louvered bonnets are more effective at preventing overheating than making bonnet shutters larger.
View original record R.R. 235B (100 T) S.H. 89. 22-7-20 G 2769 81085- To EP. From Hs. c. to BY. c. to E. c. to Mr. Hs2/LG15.10.21. RE. OVERHEATING. X3427 V766 With reference to the louvred bonnets, we suggest that before…

scan0080 The fitting of ventilating shutters in bonnets for 40/50 HP chassis destined for hot countries.
View original record R.R. 199 (250T) (SD676 19-7-17) MP180865 H085. RECEIVED 15 NOV 1921 EP c. Hs. X5421 BY/Mtn7/H. 15. 11. 21. 40/50. HP. CHASSIS. RE VENTILATING SHUTTERS IN BONNETS. Referring to your memo EP/Thnll/H.…

scan0081 Standardisation of bonnets without shutters for the 40/50 chassis to reduce rattles, based on feedback from India.
View original record Hs. from BY. C. Mr Shelton. Hs X1085 1 MAY 2 1922 REC'D BY4-P2.5.22. 40/50 CHASSIS - BONNET I attach herewith copy of a note received from Bombay, reference WG6/A8422, which is the outcome of…

scan0082 Testing ventilation shutters on postwar cars during reliability trials in India.
View original record R.R. 199 (250T) (SD676 19-7-17) MP 180865 COPY. DERBY. BOMBAY. WGS/A8.4.22. With reference to shutters for ventilation on postwar cars, I have had a very good opportunity of testing the merits of the…

scan0083 Effectiveness and design of louvres on the Goshawk and 40/50 models.
View original record To Hs. from R. c. to CJ. BJ. c. to PN. OY. c. to BY. E. c. to EB. X274 R8/M10.1.23. RE. LOUVRES. X.4240. X.274 X.3499 The louvres in the front of the Goshawk as made and arranged by us appear…

scan0084 Potential solutions to overheating problems in 40/50 and Goshawk engines.
View original record To B.J. from R. c. to C.J. LHS. c. to BY. Wor. c. to Hs. LP. c. to E. Da. X274 R5/M19.1.23. RE. OVERHEATING. X.766 X.3499 X.274. I understand that we still fear overheating on 40/50 and Goshawk, under…

scan0085 Suggestion to fit zinc blocks or sheets to neutralize water, making peaty and sea-salt water less detrimental.
View original record contd:- -2- I have suggested elsewhere that we might fit certain blocks or sheets of zinc which would have the tendency to keep the water neutral, or render peaty, and sea-salt water much less…

scan0086 Outlining eleven points for investigation regarding water boiling issues in 40/50 and Goshawk models.
View original record V3499 X1085 To Hs. from R. RG. EP. ) CJ. BY ) copies to. BJ. PN. ) OY. H. ) R 6/M10.8.23. RE. WATER BOILING. X.1751 X.3499 40/50. & GOSHAWK. X.766 X.4240 (1) The fan seems to be the most important…

scan0087 Engine performance and the Goshawk radiator shutter and by-pass system.
View original record contd:- -2- if the engine is kept pulling hard at slow speed with full throttle. Fortunately or unfortunately this is what our engines are especially capable of doing. (12) We hope we are sending out…

scan0088 Necessity of fitting ventilating shutters to polished bonnets on 40/50 HP cars to prevent overheating.
View original record To Hs. from BJ. Copy to.....By. BJ7/H24.9.24. X1085 Ventilating Shutters to Polished Bonnets on 40/50 H.P. I understand that in the past we have not fitted ventilating shutters to polished bonnets of…

scan0089 Standardisation of bonnet shutters for 'R' Series cars, with exceptions for specific countries.
View original record 810851 Hs. from BY. BY21-P31.8.22. "R" SERIES MATERIAL. Referring to my memo BY6-P25722, in connection with the material for "R" Series, I find I omitted to again remind you that we have a…

scan0090 Recommendation to continue with the present bonnet for the 40/50 'R' series due to issues with water boiling.
View original record BY. from Hs. X1085 Hs3/LG4.9.22. 40/50 BONNETS FOR "R" SERIES. Y3421 We recommend that we hold up the modification to the Bonnet to do without the shutters which was standardised sometime ago. As we…

scan0091 History and decisions regarding shutterless bonnets.
View original record X1085 BY/LMS. c. Hs. BY1C/H. 3.10.24. ----------------- BONNETS. ------- Referring to Da/Evl/M. 30.9.24, we recently wrote Sales (BJ) fully on this subject. The facts of the case are as follows:- Some…

scan0092 Sending a 5-EX Silver Ghost to Conduit Street to investigate an overheating issue, and carrying a spare bonnet for a 20 HP car.
View original record Wdr. from Hs. X55 Hs6/LG17.6.25. OVERHEATING. X766 We are sending 5-EX car to Conduit Street tomorrow. This car is a standard Silver Ghost. The car will have louvred and plain bonnets. It will carry…

scan0093 Modifications to radiator and bonnet proportions, referencing several drawings and a future meeting in Derby.
View original record To BY. from DA. c. to BJ. Hs. X1085 DA1/M5. 2. 27. EAC. 8. RADIATOR SHUTTERS AND BONNET. X. 7250 X. 1085 X. 7260 As you know we are endeavouring to come to an agreement regarding some modifications to…

scan0094 The merits and costs of fitting shutters versus permanent louvres on 40/50 HP chassis bonnets to prevent overheating.
View original record COPY x/ 1085 BJ5/D20.6.27. x766 x1085 Y8260 To R. from BJ. c/c to Hs. c. to BY. My dear R., Shutters in Bonnets - 40/50 HP. Chassis. I have made careful enquiries in regard to the above and have…

scan0095 Cost, cooling efficiency, and appearance of 40/50 model bonnet shutters and louvres.
View original record To B.J. from R. c. to Hs. BY. X1085 R1/M23. 6. 27. 40/50 BONNET SHUTTERS. X. 766 X. 8260 X. 1085 I quite agree with your memo. BJ5/D20. 6. 27., and that is why it was done years ago. Now things have…

scan0096 Removal of rear shutters on a standard car and its effect on cooling efficiency.
View original record To BJ. from Hs. c. to R. X1085 Hs6/LG30.6.27. With reference to BJ16/E27.6.27. X1085 X766 We think there should be no objection to deleting the rear shutters on the present standard car not intended…

scan0097 Deletion of rear bonnet shutters for the 40/50 HP model to achieve cost savings.
View original record To BJ. from Hs. X1085 Hs4/LG5.7.27. 40/50 HP. BONNET SHUTTERS. J8260 Now that it is agreed to delete the rear bonnet shutters, we suggest that we should introduce these without waiting for the new…

scan0098 Deletion of rear shutters and bonnet louvres on Phantom & Goshawk models to improve appearance and reduce costs.
View original record To BJ. from R. X1085 c. to Hs. R2/M5. 7. 27. PHANTOM & GOSHAWK SHUTTERS. X.55 X.5260 X.8260 X.1035 I certainly agree to deleting the rear shutters, also that we do not in future fit bonnet louvres.…

scan0099 Deletion of back bonnet shutters and painting procedures for them.
View original record To Hs. from R. c. to BJ. BY. 1085. R3/M9.7.27. BONNET SHUTTERS. X.8260 X.1085. We understand it is agreed to delete the back shutters. DA. will provide a less expensive scheme: the original one was…

scan0100 Standardisation proposal for replacing bonnets with shutters with louvred bonnets.
View original record RR 755 REVISED (10H) (DE 649 9-12-26) BM. 2/1187. X1085- COMPLETED 11.7.27 STANDARDISATION of CHASSIS PARTS. Date 11.5.27 Description of Parts. BONNET WITH SHUTTERS. [handwritten: CUT] Origin.…

scan0101 Questionnaire regarding the implementation of a new part for a chassis.
View original record STANDARDISATION OF CHASSIS PARTS (1) The number of the first chassis on which the new part will be fitted. E.2. (2) Date when the chassis will be handed to test. 1.10.27. (3) Cost of scrapped…

scan0102 Requesting the new comparative cost for louvres and shutters after a reduction in production time.
View original record To My/Rb. from Hs/Rm. X1085 Hs/Rm5/LG11.8.27. X55 We have a figure for the cost of louvres and shutters as follows :- Louvres £28. 14. 0 Shutters £13. 12. 0 We understand that the cost of the louvred…

scan0103 Policy on using louvred bonnets versus bonnet shutters for 40/50 HP cars, especially for tropical climates.
View original record To Wor. from Hs/Rm. X55 Hs/Rm7/LG11.8.27. 40/50 HP. BONNET. f8260 With reference to BJ15/E22.7.27. We wonder whether, when B.J. wrote this, he was aware of the recent reduction in cost of the louvred…

scan0104 Instruction to continue supplying louvred bonnets to 40/50 HP chassis destined for hot countries.
View original record Sn. [crossed out] c. to BP. [crossed out] c. to Hs. X55 BY1/G.30.8.27. A-30 30-8-27 40/50 HP. CHASSIS - LOUVRED BONNETS. --------------------------------- As we have not yet received any definite…

scan0105 Design of bonnet shutters versus louvres for the 'Phantom' model.
View original record BJ. from R. c. to Wor. BY. c. to Hs. SG. X1085 R2/M17.9.27. RE. BONNET SHUTTERS. X. 8260 X.55 X.1085 Referring to your BJ10/E15.9.27 from recent experience it is extremely desirable to have all…

scan0106 High-speed test results on the cooling benefits of front and rear shutters versus a louvred bonnet.
View original record To BJ. from Hs. X55 Hs1/LG19.9.27. With reference to BJ4/E14.9.27. X55 (crossed out) X766 Our high speed tests shew that the benefit derived from opening either the front or rear shutters only is…

scan0107 Arrangement of a car to test a louvred bonnet against a closed bonnet.
View original record To BJ. from Hs. X1085 X8260 Hs4/LG20.9.27. RE. BONNET SHUTTERS. With reference to BJ10/E19.9.27. We will arrange to have a car at your disposal tomorrow which you can try the louvred bonnet compared…

scan0108 Scuttle ventilation tests on the 10-EX model, comparing the effects of louvered and plain bonnets on cabin temperature.
View original record X55 To DA/EV. from Hs/Rm. Hs/Rm5/LG2.1.28. SCUTTLE VENTILATION EAC.14. 776 During the recent snap of cold weather, we found that the only method of keeping reasonably warm in the driving seats of…

scan0109 Insufficient cooling on the Phantom II model in hot climates and the efficiency of its bonnet shutters.
View original record TO Hs. from Sg. c. Wor. C. X1085 Sg24/El.9.30. P.II. COOLING. X. 766 X. 1085 X. 7260 You will remember that ever since I came back from America I have been expressing views to the effect that I…

scan0110 Reconsideration of front versus rear shutters for the Phantom II cooling system to aid petrol tank cooling.
View original record X1085 To Sg. From Hs. c. to Wor. c. to C. HS.5/MJ.3.9.30. x766. x1085 x7260. PHANTOM II COOLING. Re. Sg24/El.9.30. It was all arranged on the Experimental Dept's recommendation that the front shutters…

scan0111 Decision to delete the back bonnet shutters and the painting process for the remaining ones.
View original record COPY. To Hs. From R. c. to BJ. BY. R3/M9.7.27. BONNET SHUTTERS. We understand it is agreed to delete the back shutters. Da. will provide a less expensive scheme: the original one was made when we…

scan0112 Confirming design changes for the 40/50 HP bonnets regarding shutters and louvres.
View original record COPY. To C. From BJ. c. to Ss. c. to Wor. c. to R. c. to By. c. to Hs. 40/50 HP. BONNETS. Confirming a conversation I had with R. yesterday, it was decided: a. That there shall only be one shutter…

scan0113 Removal of rear bonnet shutters and its effect on cooling efficiency.
View original record COPY. to B.J. From Hs. c. to R. Hs6/LG30.6.27. With reference to BJ16/E27.6.27. We think that there should be no objection to deleting the rear shutters on the present standard car not intended for…

scan0114 Various modifications for increased engine cooling on 25 HP and 45 HP models.
View original record Hs. from R. c. Sg. Wor. c. By. C. V1085 R1/M4.7.30. X.766 X.1085 X.7250 X.5250 25 HP. & 45 HP. MODIFICATIONS FOR INCREASED COOLING I do not like the idea of cutting away the front apron because of the…

scan0115 Impracticality of current bonnet shutters and suggesting a more user-friendly design.
View original record COPY. X1085. S/W. To Hs. From Sg. Sg10/D30.7.30. Re. Shutters in Bonnets. X.7260. X.1085. In Hs/Rm2/MJ. 22.7.30 it says: "The trouble is that most of our cars have shutters not louvres fitted, and…

scan0116 Overheating issues and proposed modifications for the Phantom II model.
View original record X/1085. To Hs. from Sg. C. Wor. C. PN. C. H. EF. MX. Hd. BY. Sg3/E4.9.30. X.766 X.3875 X.1085 X.3220 X.196 OVERHEATING - PHANTOM II I have read with interest the contents of Hs/Rml/AD2.9.30 and I…

scan0117 Ongoing tests for Phantom II overheating by investigating the reduction or modification of undershields.
View original record X1085. To Sr. From Hs. c. to SS Mor. c. to C. c. to FK. c. to H. c. to SS Mx. c. to XP. c. to Hdl. c. to Sy. Hs.4/HMJ.8.9.30. X.766. X.3875. X.1085. X.7220. X.196. OVERHEATING - PHANTOM II. Replying…

scan0118 Modifications and improvements to the vehicle's cooling system, including shutters, radiator, and louvres.
View original record X1085 HS. FROM R. R4/M1.10.30. C. to SG. WOR. BY. P. 2. COOLING. C. to E. DA. C. X.7260. X.765. X.7250. We were very pleased to see that some of the features we have suggested have been made, and…

scan0119 Merits of square tube radiators, overflow valves, and bonnet vents.
View original record HS. } FROM R. EY. } 21085 R1/M14.10.30. Copy to SG. Copy to WGR. Copy to E. DA. EV. RADIATORS & BONNETS. SQUARE TUBES? OVERFLOW VALVE, & BONNET VENT. X.7250 X.3260. X.5250. X.1035. X.7260. X.766.…

scan0120 Benefits of square versus round radiator tubes and updating bonnet vent designs.
View original record COPY. X1085. To Wor. From Sg. c. to Hs. By. c. to EV. re Radiators & Bonnets. Square Tubes, Overflow Valve and Bonnet Vent. Sg18/E27.10.30 X.7250.X.5260 X.5250.X.1085. X.7260.X.766. I have just seen…

scan0121 Performance of square radiator tubes compared to round tubes and the design of a bonnet for ventilation.
View original record COPY. X1085. To Wor. From Hs/Rm. Hs/Rm.1/MS30.10.30. Re. Radiators and Bonnets. X.7250. X.1085. X.5250. X.766. X.7260. X.5260. With reference to Sgl8/E.27.10.30. We think that the real facts that R.…

scan0122 Requesting the manufacture of a new ventilated bonnet with three shutters for testing on a 40/50 model.
View original record X1085. To RHC. From Hs/Rm. Hs/Rm.11/MJ.13.4.31. NEW VENTILATED BONNET. X1085. x1260. You will remember that we mentioned to you the other day the new ventilated bonnet shutters for the 40/50. We asked…

scan0123 Appearance and fitting of new 'flip-flap' bonnet ventilators for show cars.
View original record Hs 81085. S/W. [Crossed out: To Wor. from Sg.] c. to Hs. Sg7/D25.6.31. Re: Bonnet Ventilators. Thanks for Worl/GR.20.6.31. I saw the new flip-flap shutters yesterday on 25-EX. I was not altogether…

scan0124 Consultation on a reply regarding bonnet ventilators.
View original record To Hs. from Wor. To SFT. " " [struck through] 81085. Wor3/T26.6.31. Re Bonnet Ventilators. Referring to Sg7/D25.6.31. Will SFT. please consult with Hs. and advise me as to what I shall reply. Our copy…

scan0125 Criticisms and requested modifications for 'Flip-Flap' type bonnet ventilators.
View original record To RHC. From Hs/Lid. Hs/Lid.3/MJ.26.6.31. BONNET VENTILATORS - N.SCH.3232. The Flip-Flap type ventilators which were fitted to the bonnet on 25-EX. have been criticised on various points. Firstly, the…

scan0126 Design improvements for flip-flap bonnet shutters, covering operation and construction.
View original record X1085 To Hs. from Ev. c. Ev. Sg. Evl/26.6.31. X.1085 X.7260 BONNET SHUTTERS. As we hope to standardise the flip-flap shutters for P.2. in time for Olympia, we are anxious to get the design correct as…

scan0127 Bonnet materials, riveting specifications, and concerns about rust prevention.
View original record Evl/26.6.31 contd. -2- In the new thick metal it may be different. Also we suggest that you use the riveting sent to you for the thick bonnet N.Sch.3294, so reducing the rivets to eight per shutter.…

scan0128 Operational and constructional modifications for bonnet shutters.
View original record To Da. from Hs/Lid. c. EV. c. Sg. Hy. 81085 Hs/Lid/AD30.6.31. BONNET SHUTTERS. With reference to the Flip Flap bonnet shutters recently submitted for approval and with reference to Wl/26.6.31, we are…

scan0129 The schedule for converting bonnets to use modified flip-flap shutters for the Show chassis.
View original record Sg. from Wor. c. to Hs. c. to Hs/Ltd. 81085. Wor4/GR.1.7.31. Re: Bonnet Ventilators. Sg7/D25.6.31. I understand that a car will be fitted with the modified flip-flap shutters on Friday next. If this…

scan0130 Alternative methods for finishing the edges of bonnet shutters.
View original record X1085 Hs. from Da/Ev. g. Sg. Wor. c. Ev. Da/Ev1/M2.7.31. RE : BONNET SHUTTERS X.1085. Further to our Ev1/26.6.31, re the above, after a discussion with Sg. we would like you to radius the edge of the…

scan0131 Bringing a car fitted with modified flip flap bonnet ventilators for an inspection.
View original record To Sg. from Hs/Lid. c, Wor. Y 1085. Hs/Lid2/AD3.7.31. BONNET VENTILATORS. We now have a car fitted up with the modified flip flap shutters and propose to bring it down to London on Monday next for…

scan0132 Bonnet ventilators, arranging a car inspection in London with modified flipflap shutters.
View original record S/W 81085. RECEIVED 1931 JUL 16 H To Hs. from Sg. re Bonnet Ventilators. Sg1/E4.7.31 Replying to your Hs/Lid2/AD3.7.31 it will be quite convenient for the car with the modified flipflap shutters to be…

scan0133 Approval and standardisation of modified flap bonnet ventilators for the N.2. series and Show cars.
View original record NORS. To Wor. from Sg. re Bonnet Ventilators. Copy to Hs. Hs/Lld Cxr Referring to Wor4/GR.1.7.31 I have this afternoon seen the modified flap shutters on the experimental car brought to London and…

scan0134 Bonnet ventilators and overheating concerns related to different radiator tube types.
View original record Y1085 To Wor. From Hs/Rm. 666 Hs/Rm.3/MJ.7.7.31. BONNET VENTILATORS. With reference to Sg18/E6.7.31. At the present moment it is apparent that N.2 Series will not be fitted with the American type…

scan0135 Two different aluminium bonnet designs, one with flip-flap shutters and another louvred version, with suggestions for improving the latter.
View original record HS. FROM DA/EV. C. to SG. WOR. BY. re. BONNETS. X1085 DA/EV1/M7.7.31. X.335. X.1085 We have now two designs for a bonnet in aluminium, having flip flap shutters and no rivets. So far we have not dealt…

scan0136 Fitting louvres instead of bonnet ventilators to Continental chassis for the Olympia and Paris Shows.
View original record HS 81085 To Wks. from Sg. Copy to Ms. Hy/Bld. Cc. re Bonnet Ventilators. Sg16/E7.7.31 Referring to Sg16/E6.7.31 the Sales Dept. are particularly anxious that these should not be fitted to the…

scan0137 Future standards for bonnet ventilators, specifically the transition from sliding to flap type shutters.
View original record Hs J1085. To Wor. from Sg. re Bonnet Ventilators. Sg7/E8.7.31 Copy to Cr. Hs. Thanks for Wor6/GR.7.7.31 together with memo. from Hs. I take it that, so far as future standards are concerned, the…

scan0138 Use of hard versus soft aluminium for louvred bonnets and the necessity of a stiffening frame.
View original record COPY. X1085. Da/Ev. c. Sg. c. Wor. c. Hs. By/Cgh18/G.10.7.31. X.385. X.1085. RE. BONNETS. -------- With reference to Da/Evl/M.7.7.31. although the Works did at one time use soft aluminium for making…

scan0139 Standardisation sheet regarding the design alteration of flip flap type bonnet ventilators.
View original record X1085. To R. From Hs/Lid. Hs/Lid.6/MJ.14.7.31. X.7260. X.1085. STANDARDISATION SHEET. FLIP FLAP TYPE BONNET VENTILATORS. We have moved the pivot of the shutters .250" nearer the centre than on the…

scan0140 Alternative designs and material choices for rivetless car bonnets.
View original record 81085. To R. from Hs/Lid. C.c. Sg. HOF. C.c. A. Dn. C.c. Ev. Hs/Lid/AD.15.7.31. RE : RIVATLESS BONNETS. X.7260. X.1085. We have now several alternative designs to work on, and it appears necessary to…

scan0141 Potential overheating in Left-hand drive Phantom II cars for America and proposing the incorporation of 'flap' type shutters.
View original record 81085. S/W. (Hs.) To await return. Sg5/D20.7.31. re Left-hand P.II for America. --------------------------------- You will remember that the bonnets of these are plain, i.e. without any ventilators.…

scan0142 Development of bonnets without rivets and issues with louvred designs.
View original record BY. ) FROM DA/EV. HS. ) X1085 DA/EV1/M20. 8. 31. Copy to SG. WOR. X. 7260 X. 5260 X. 385 X11085. BONNETS WITHOUT RIVETS. We had hoped that before now we should have had an opportunity of seeing a…

scan0143 Design and development of rivetless aluminium bonnets, noting pressure from the sales department.
View original record HS. ) FROM DA/EV. BY. ) X1085 DA/EV1/M22.8.31. RIVETLESS BONNETS. X.385 X.1085. WE FEEL THAT WE ARE IN A VERY INSECURE POSITION WITH RESPECT TO THIS DETAIL, AS SALES WERE PRESSING FOR US TO DO…

scan0144 Requesting a blueprint to fit extracting louvres in the scuttle of a 25HP Special Touring Saloon.
View original record X/1085 BY. FROM DA/EV. DA/EV3/M22.8.31. Copy to - HS. 25HP. SPECIAL TOURING SALOON. X.5120. X.1085. Sales say that they will need a louvred bonnet on this, and subsequent cars. We believe that you…

scan0145 Design of a louvered bonnet and scuttle for a 25HP 'U' Series Special Touring Saloon.
View original record X1085 BY. } FROM DA/EV. HS. } DA/EV2/M2.9.31. Copy to - SG. 25HP. - 'U' SERIES. SPECIAL TOURING SALOON. X.5120 X.1085 X.5992. We believe Sales will require this model of car to have a louvred bonnet…

scan0146 Left-handed Phantom I models for America, specifically following up on a query about bonnets.
View original record S/W To Hs. from Sg. re Left-handed P.I for America. Sgl/E4.9.31 Referring to Sg5/D20.7.31 re bonnets, I do not know whether you have sent a reply in my absence - if so, I have not seen it but should…

scan0147 The design, testing, and implementation of rivetless bonnets.
View original record HS.) FROM DA/EV. BY.) X1085 C. to SG. WOR. E. RIVETLESS BONNETS. DA/EV4/M4.9.31. X.385 X.1085. We thank you for HS/LID2/AD31831., which makes the question of shutter symmetry quite clear. We are…

scan0148 Use of bonnet shutters on left-hand drive P.2 cars for the American market.
View original record X 1085 To Sg. From Hs. c. to Wor. Hs.7/MJ.7.9.31. L.H. P.2 CARS FOR AMERICA. Replying to Sg.5/D20.7.31. We find that all the left-hand cars which have been despatched to America have had shutters in…

scan0149 Information about introducing 'flip-flap' shutters to the L.H.Phantom II chassis for American cars.
View original record [Handwritten]: 81085. [Handwritten in red]: Hs To Wor. [Struck through] From Sg. Copy to Hs. re L.H.P.II Cars for America. Referring to Hs.7/MD.7.9.31 I should be glad if you would let me know at what…

scan0150 Request for a photograph of flip-flap shutters on a bonnet for an L.H.Phantom II car destined for America.
View original record Y1085 To Hs. from Sg. re L.H.P.II Car for America. Sg4/E21.9.31 Referring to former correspondence I have found out from Wor. that we can introduce flip-flap shutters at certain stages with and…

scan0151 Improving engine cooling by comparing the effectiveness of bonnet shutters versus louvres.
View original record COPY. 81085. HS. FROM R. C. to SG. WOR. C. to BY. DA. E. R1/M1.10.31. X1085 ------------- X766 COOLING OF CARS. From the high pressure of air under the bonnet it is evident that we must work at…

scan0152 Reminder note from Sg. to Hs. regarding a requested photograph of flip-flap shutters for a L.H.Phantom II Car for America.
View original record X1085. RECEIVED Sg14/E2.10.31 1931 OCT 3 To Hs. from Sg. re L.H.P.II Car for America. Just a note to remind you that I am waiting for the photograph of flip-flap shutters asked for in my Sg4/E21.9.31.…

scan0153 Photographs of bonnets with flip-flap shutters and without rivets for Left-Hand Phantom II cars.
View original record 81085. To Sg. From Hs. Hs.3/MJ.3.10.31. LEFT-HAND PHANTOM 11 CARS. Attached herewith photographs of the bonnet with flip-flap shutters. We have also included the bonnet without rivets as you may wish…

scan0154 Photograph showing a close-up of a car's bonnet, side lamp, and scuttle.
View original record 23001.

scan0155 Photograph showing a side view of a car's bonnet and scuttle.
View original record No text found

scan0156 Cost and an alternative to adding flip-flop shutters to the bonnet.
View original record 81085. To Wor. From Hs. c. to Sg. Hs.7/MJ.5.10.31. It will be seen by R.1/M1.10.31 that R. is suggesting five flip-flop shutters each side of the bonnet, making ten in all. We do not know the cost of…

scan0157 Deferring action on increasing the number of flip-flap shutters.
View original record Hs 81085. To [strikethrough] from Sg. Copy to Hs. re Shutters. Sg35/E12.10.31 Referring to R.1/M1.10.31 and Hs.7/MJ.5.10.31 re increasing in number the flip-flap shutters from 3 to 5, I think this is…

scan0158 Proposal to modify the flip flap shutters on the rivetless bonnet for the 22-EX model.
View original record To R. From Hs/Lid. c. to Ss. By. 81085. Hs/Lid.6/KT.19.10.31. FLIP FLAP SHUTTERS. x7260. It is proposed that the modifications to the flip flap shutters showed to 'R' on the rivetless bonnet on 22-EX…

scan0159 Aesthetic improvements to bonnet shutters by widening the gap and rounding the edges, and requesting a sample.
View original record COPY. 81085. DA/EVL/M20.10.31. X1085 BY. FROM DA/EV C. to WOR. SG. HS. BONNET SHUTTERS. SG. pointed out to me at the Salon that our shutters on the whole did not look quite as good as some we have…

scan0160 Clearance of bonnet shutters and the impact of paint thickness.
View original record DA/EV. from Hs/Lid. c. to Wor. Sg. By. Y1085. Hs/Lid.2/KT.21.10.31. BONNET SHUTTERS. X.1085. X.385. With reference to DA/EV1/M20.10.31. the flip flap shutters which were approved by Sales had…

scan0161 Providing the contact details for W. H. Colt Ltd. and requesting an inspection of their ventilators.
View original record 81085. Bkl.2/WT21.10.31. Sg...from Bkl. Colt Ventilators. The address of these people is :- W. H. Colt Ltd. Bush House, W. C. 2. where a ventilator and wind-panel can be seen in operation. Their…

scan0162 Particulars of Colt K.K. patent ventilators and other engine components.
View original record s/w. To Hs. From Lp. Copy to Wor. r1085 Lp3/LAM.24.10.31. Re: Colt K.K. Patent Ventilators. We are sending you herewith particulars of the engine bonnet louvres and scuttle ventilators, also roof type…

scan0163 Modifications to bonnet shutters, specifically increasing the radius and gap for a continental touring saloon.
View original record COPY. X1085 HS. FROM DA/EV. DA/EV3/M26.10.31. X1085 X7260 C. to SG. MOR. BY. BONNET SHUTTERS. We thank you for HS/LID2/KT221031. We looked at the shutters on the N. 2. series cars at Olypia. and after…

scan0164 Forwarding an original letter from W. H. Colt, Ltd. concerning ventilators.
View original record S/W. 81085. Lpl/LAM.30.10.31. To Hs. From Lp. Copy to Wor. Re: W. H. COLT, LTD. - VENTILATORS. We attach hereto original letter from W. H. Colt, Ltd., concerning their ventilators, drawings of which…

scan0165 Letter from W. H. Colt Ltd. discussing engine cooling, heat build-up, and potential fan modifications.
View original record W. H. COLT, LTD. BETHERSDEN NEAR ASHFORD KENT TELEPHONE BETHERSDEN 6 TELEGRAMS COLT BETHERSDEN KENT WHC/V/P. BUSH HOUSE ALDWYCH LONDON. W.C.2 LONDON DIRECTOR: I. J. O'HEA, F.C.I.S. TELEPHONE AND…

scan0166 Engine and car interior ventilation methods, including proposed tests and commercial negotiations for related devices.
View original record -2- Obviously the fan's capacity is determined by the static pressure conditions prevailing under the bonnet, and for this reason whatever type of fan be employed there is the need for a rapid exhaust…

scan0167 The final page of a typed letter from W. H. Colt Ltd. concerning exclusive rights.
View original record -3- exclusive rights for a term of years should you prefer this. With compliments, Yours faithfully, W. H. COLT LTD. [Signature] [Faint watermark text: BERMICO BOW MADE IN BRITAIN]

scan0168 Product sheet for a Type B.S. Vehicle Roof Ventilator (Air Extractor).
View original record COLT VENTILATION LTD. BUSH HOUSE, ALDWYCH, LONDON, W.C.2 (Reproduced by courtesy of “THE MOTOR,” 18th August, 1931) Type B.S. Vehicle Roof Ventilator (Air Extractor) PATENTED

scan0169 Advertisement sheet for a patented Scuttle (H.O.) type combined air extractor and wind scoop from Colt Ventilation Ltd.
View original record COLT VENTILATION LTD. BUSH HOUSE, ALDWYCH, LONDON, W.C.2 Deflector lowered—used as wind scoop. Deflector raised—used as air extractor. View of operating handle inside car. Scuttle (H.O.) Type Combined…

scan0170 Blueprint showing a louvered vent and a side view of a domed component, possibly a lamp.
View original record Nº 27

scan0171 Multi-view engineering drawing of a piston-like component with internal fins.
View original record F 52

scan0172 Technical drawing of a Scuttle Ventilator (H.O.).
View original record COLT VENTILATION LTD. BUSH HOUSE, LONDON, W.C.2. Protected by Worlds Patents and Registered Designs Scuttle ventilator (H.O.) ATT DIMENSIONS DATE THIS DRAWING IS THE PROPERTY AND COPYRIGHT OF COLT…

scan0173 Blueprint showing two designs for car bonnet louvres.
View original record COLT VENTILATION LTD. BUSH HOUSE, LONDON, W.C.2 Protected by World Patents and Car bonnet louvre DRG NO. DATE TRACED BY CHECKED BY AND APPROVED BY COLT VENTILATION LTD.

scan0174 Response to W.H. Colt, Ltd. regarding proposals for bonnet ventilators and other car components.
View original record Copy to L.P. Wor. Y1085. Hs/Lid.14/KT. 4th November 1931. W.H. Colt, Ltd., Bush House, Aldwych, London. W.C.2. Dear Sirs, Your letter WHC/V/P of the 28th. Oct. has been handed on to us from Conduit…

scan0175 Letter from W. H. Colt, Ltd. regarding the design of a 'K.K' ventilator for an engine bonnet.
View original record W. H. COLT, LTD. 81085 BETHERSDEN NEAR ASHFORD - KENT - TELEPHONE BETHERSDEN 6 TELEGRAMS COLT BETHERSDEN KENT BUSH HOUSE ALDWYCH LONDON. W.C.2 LONDON DIRECTOR: J. O'HEA, F.C.I.S. TELEPHONE AND…

scan0176 Letter regarding the performance of a device and the sourcing of samples for ventilators, fans, and radiator contra-shields.
View original record -2- We quite understand that you would prefer to leave the matter of terms in abeyance until you have had an opportunity of forming an opinion of the satisfactory performance of the device in…

scan0177 Sketch showing the placement and dimensions of a 'Colt K extractor' ventilator on a car bonnet.
View original record Colt 'K' extractor 18" long. maximum projection - 1/2" 15" COLT VENTILATION LTD. BUSH HOUSE. ALDWYCH. W.C.2.

scan0178 Letter to W.H. Colt Ltd. confirming an order for a pair of aluminium bonnet ventilators for testing.
View original record X1085. Hs/Lid.2/AD. 10th November 1931. Messrs. W.H. Colt Ltd. Bush House, Aldwych, London, W.C.2. Dear Sirs, Thank you for your JOH/KH/K. of the 7th inst. We note that you will supply us with a pair…

scan0179 Letter from W. H. Colt, Ltd. regarding the provision of a pair of aluminium bonnet ventilators for testing.
View original record 81085. W. H. COLT, LTD. BETHERSDEN NEAR ASHFORD KENT TELEPHONE BETHERSDEN 6 TELEGRAMS COLT BETHERSDEN KENT BUSH HOUSE ALDWYCH LONDON. W.C.2 LONDON DIRECTOR: I. J. O'HEA. F.C.I.S. TELEPHONE AND…

scan0180 Letter from W. H. Colt Ltd regarding the testing of bonnet ventilators made from aluminium and brass.
View original record 81085. W. H. COLT, LTD. BETHERSDEN NEAR ASHFORD - KENT - TELEPHONE BETHERSDEN 6 TELEGRAMS COLT BETHERSDEN KENT BUSH HOUSE ALDWYCH LONDON. W.C.2 LONDON DIRECTOR: I. J. O'HEA. F.C.I.S. TELEPHONE AND…

scan0181 Cover letter forwarding an inquiry from W.H. Colt, Ltd. concerning bonnet ventilators.
View original record S/W. To Hs/Lid. 81085. Lp1/LAM.19.11.31. Re: W.H. COLT, LTD., BONNET VENTILATORS. I attach hereto a letter from Messrs. W.H.Colt, Ltd., and shall be glad if you will kindly send them the information…

scan0182 Letter from W. H. Colt Ltd. discussing the inspection and potential improvement of an extraction device, oil sump, and fan.
View original record W. H. COLT, LTD. BETHERSDEN NEAR ASHFORD KENT TELEPHONE BETHERSDEN 6 TELEGRAMS COLT BETHERSDEN KENT BUSH HOUSE ALDWYCH LONDON. W.C.2 LONDON DIRECTOR: I. J. O'HEA, F.C.I.S. TELEPHONE AND TELEGRAMS…

scan0183 Request for the minimum and maximum revolutions per minute for two nominal fan types for test verification.
View original record -2- In connection with these fans may I trouble you for the minimum and maximum revolutions per minute of your nominal two fan types which I require to check my own tests. With compliments, Yours…

scan0184 Standardisation of pivoted flip-flap type bonnet ventilators.
View original record RR 755 (10H) (8459, 24-10-30) 6/3185. 81085 COMPLETED 21.11.31. STANDARDISATION of CHASSIS PARTS. Date 8.7.31 Description of Parts. Pivoted FLIP FLAP TYPE BONNET VENTILATORS. Origin. To improve…

scan0185 Standardisation form for a new part to be fitted on the N.2. Series chassis, including cost details.
View original record STANDARDISATION OF CHASSIS PARTS The number of the first chassis on which the new part will be fitted..... N.2. Series. Date when chassis will be handed to test........................ Production.…

scan0186 Letter from W. H. Colt Ltd. discussing bonnet ventilators and a new fan design with automatic blade-pitch adjustment.
View original record W. H. COLT, LTD. BETHERSDEN NEAR ASHFORD - KENT - TELEPHONE BETHERSDEN 6 TELEGRAMS COLT BETHERSDEN KENT BUSH HOUSE ALDWYCH LONDON. W.C. 2 LONDON DIRECTOR: I. J. O'HEA, F.C.I.S. TELEPHONE AND TELEGRAMS…

scan0187 Page 2 of a letter discussing fan performance charts, comparing a standard fan to one with adjustable blades.
View original record 2 The chart showing a normal fan clearly shows that performance above and below a certain number of revs. The strongly rising performance curve explains the overloading of fan-belt. The air volume…

scan0188 Performance graph for a Colt K.K. Fan showing HP and Air Volume curves.
View original record COLT K.K. FAN H.P. AIR VOL. 1000 2000 3000 4000

scan0189 Hand-drawn graph showing Horsepower and Air Volume characteristics for Fixed Blades.
View original record Fixed BLADES H.P AIR VOL 1000 2000 3000 4000

scan0190 Letter to W. H. Colt Ltd. regarding the loan of a standard Phantom II type fan.
View original record Y1085. HS/Lid.1/MA. Nov., 30th.,1931. W. H. Colt Ltd., Bush House, Aldwych, London W.C.2 Dear Sirs, We are sending to you today, on loan, under separate cover, one complete fan, being our standard…

scan0191 Standardisation of flip flap type bonnet ventilators similar to the Phantom model to overcome overheating.
View original record RR 755 (10H) (B459. 24-10-30) 6/3185. X1085. COMPLETED 4.12.31. STANDARDISATION of CHASSIS PARTS. Date 5.10.31. Description of Parts. FLIP FLAP TYPE BONNET VENTILATORS SIMILAR TO PHANTOM. Origin. To…

scan0192 Introduction of a new standardized part for a chassis.
View original record STANDARDISATION of CHASSIS PARTS The number of the first chassis on which the new part will be fitted................. 101 in 'T'. Date when chassis will be handed to test ...... Cost of scrapped…

scan0193 Letter from W.H. Colt Ltd. requesting progress on experiments with an Aluminium Bonnet Vent.
View original record STATION: PLUCKLEY, S.R. PLEASE REPLY TO BETHERSDEN. X1085. W. H. COLT, LTD. BUSH HOUSE ALDWYCH LONDON, W.C.2 LONDON DIRECTOR: I. J. O'HEA, F.C.I.S. TELEPHONE AND TELEGRAMS TEMPLE BAR 5112 WHC/W/P…

scan0194 Letter from W. H. Colt Ltd. concerning tests on a self-adjusting fan and bonnet ventilation device.
View original record X1085. W. H. COLT, LTD. BETHERSDEN NEAR ASHFORD - KENT - TELEPHONE BETHERSDEN 6 TELEGRAMS COLT BETHERSDEN KENT BUSH HOUSE ALDWYCH LONDON. W.C.2 LONDON DIRECTOR: I. J. O'HEA, F.C.I.S. TELEPHONE AND…

scan0195 Page two of a letter from Colt Ventilation Ltd discussing a fan device and seeking approval.
View original record -2- through the fan without absorbing moreHP. and at the same time relieve the bonnet space of "high pressure" and excessive accumulation of heat and fumes. Your present type of fan under such…

scan0196 Letter to W.H. Colt Ltd. regarding inconsistent test results for a bonnet ventilation device due to windy conditions.
View original record X1085. Hs/Lid.3/MA. February 5th, 1932. W.H. Colt Ltd., Bush House Aldwych, London, W.C.2. Dear Sirs, We beg to acknowledge receipt of your letter(ref WHC/EH/K) of the 3rd inst., and we are pleased to…

scan0197 Letter to W.H. Colt Ltd. regarding the disappointing test results of their bonnet ventilators.
View original record Copy to Lp. Wor. Hs/Lid.S/MA. February 10th, 1932. W.H.Colt Ltd., Bush House Aldwych, London W.C.2. Dear Sirs, We have completed our test on the pair of bonnet ventilators you submitted to us and have…

scan0198 Graphs of tests recording under-bonnet pressure versus road speed for different ventilation configurations.
View original record P1 243 COLT BONNET VENTILATORS. TESTS RECORDING PRESSURE UNDER BONNET. STANDARD UNDERSHIELDS. RECORDED BY U TUBES. CHASSIS No. 20 EX. RESULTS GIVEN ARE AVERAGE OF 4 READINGS. TWO ON EACH SIDE OF…

scan0199 Letter from W. H. Colt Ltd. regarding preliminary test results for a bonnet device and alternative fan systems.
View original record X1085 W. H. COLT. LTD. BETHERSDEN NEAR ASHFORD - KENT - TELEPHONE BETHERSDEN 6 TELEGRAMS COLT BETHERSDEN KENT BUSH HOUSE ALDWYCH LONDON. W.C.2 LONDON DIRECTOR: I. J. O'HEA. F.C.I.S. TELEPHONE AND…

scan0200 Letter to W.H. Colt Ltd. regarding the unsatisfactory results of tests on a bonnet ventilator device.
View original record X.1085. Hs/Lid.8/MA. February 15th, 1932. W.H.Colt Ltd., Bush House, Aldwych, W.C.2. Dear Sirs, We are in receipt of your letter of WHC/V/P.(undated) and for which we thank you. With regard to the…

scan0201 Thermostatically operated bonnet shutters, referencing a picture from a Lincoln.
View original record X1085 To E. From Hs/Rm. Hs/Rm.9/MJ.24.4.34. One of your people asked me what I knew about thermostatically operated bonnet shutters the other day. Here is a picture of those fitted to the Lincoln…

scan0202 Letter from Ford Motor Company regarding oil consumption and thermostatically operated bonnet side shutters on Lincoln cars.
View original record Ford Motor Company, Ltd. DAGENHAM, Essex. X1085 TELEPHONE: RAINHAM 300. TELEGRAMS: FORDMOTOR, TELEX, DAGENHAM. CABLES: FORDMOTOR, DAGENHAM. PLEASE ADDRESS ALL COMMUNICATIONS TO THE COMPANY. IN YOUR…

scan0203 Description of the operation of thermostatic radiator shutters and hood ventilators.
View original record X1085 THERMOSTATIC RADIATOR SHUTTERS AND HOOD VENTILATORS ------------------------- After becoming heated to the most efficient operating point, the water in the cooling system is maintained at an…

scan0204 Sales brochure for the new series of V-12 cylinder Lincoln motor cars, featuring the five-passenger sedan and seven-passenger limousine.
View original record THE LINCOLN PRESENTING THE LINCOLN OF TODAY A NEW SERIES OF V-12 CYLINDER MOTOR CARS YEAR after year Lincoln goes on building a better motor car. Every change that has ever been made—in design,…

scan0205 Promotional brochure detailing the features and specifications of the Lincoln V-12 cylinder motor cars.
View original record THESE MOTOR CARS ARE OFFERED TO YOU AS THE LINCOLN A WELL-ROUNDED, FINISHED PRODUCT THAT EXPRESSES MORE CLEARLY THAN EVER BEFORE THE ESTABLISHED HIGH IDEALS OF THE LINCOLN MOTOR COMPANY. AFTER years…

scan0206 Comparison of bonnet temperatures between thermostatically controlled shutter and bypass cooling systems at 30 and 60 MPH.
View original record X1085 14.9.34. COMPARISON OF BONNET TEMPERATURES WITH (a) Thermostatically controlled shutter system (b) Thermostatically controlled bypass system. Maintained Water Temps. Air Temp. Bonnet Air Temp.…

scan0207 Crack testing and refitting of front yokes on a Bumper Chassis.
View original record 1024 To Rm. from HPS/RH. c. By. c. HPS. c. Rm/AFM. HPS/RH.3/BA.3.7.39. B.V. Front Axle (Bumper Chassis) Front Yokes Ex.32427/8 1% Chrome steel. These yokes have run 100 hours on Bumper Chassis, were…

scan0208 The modification of the upper yoke bearing on the Silver Wraith Bump Chassis.
View original record 1024+ 666. To HPS/RH. Rm/HFP.1/JH.7.7.39. Silver Wraith Bump Chassis. Will you please modify the upper yoke bearing according to drawing No.A.101 supplied by Howard Graham Ltd. th take a Harris bush…

scan0209 Request to fit a new rear spring to a B.V. bump chassis.
View original record 1024. To HPS/RH. Rm/HFP.1/JH.13.7.39. B.V. Bump Chassis. Will you please fit a new rear spring to the B.V. bump chassis. Rm/HFP.

scan0210 The build-up and fitting of springs for a Bentley V Bump Chassis.
View original record 1024 To HPS/RH. from Rm/HFP. Rm/HFP.4/JH.22.8.39. Bentley V Bump. Chassis. Will you please build up the front of the B.V. bump chassis and fit 5 1/2" deflection 1000 lb. Toledo Woodhead rear springs.…

scan0211 List of features to be built onto the Silver Wraith bump chassis.
View original record γ 1024 To HPS/RH. from Rm/AFM. Rm/AFM.12/MH.24.8.39. Herewith a list of features we should like building on to the Silver Wraith bump chassis. When you are able to start work on this chassis should…

scan0212 Revised list of new features for the W.80 Bump Chassis.
View original record 22.8.39. Revised list of new features for W.80 Bump Chassis. New front bump buffers to EXS.1828. Lower triangle levers lightened to EXS.1756 and modified as in SCD.1472 for simplified lower bearing.…

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