| Description | Date | Identifier | |
| Casting solid brake drum rims to avoid machining issues with hard spots on the webs. | 9th Sep 1937 | Box 120 \ 1 scan0212 | |
| The heat treatment and nickel plating process for aluminium brake drums, requesting drawing updates. | 10th Sep 1937 | Box 120 \ 1 scan0213 | |
| Expressing a preference to manufacture Bentley brake drums in the company's own foundry. | 22th Sep 1937 | Box 120 \ 1 scan0214 | |
| Testing 5% carbon steel brake drums, which resulted in violent brake judder, leading to a recommendation to cease further testing. | 30th Sep 1937 | Box 120 \ 1 scan0215 | |
| The design of cast iron brake drums for Bentley II.A and Bentley III models. | 30th Sep 1937 | Box 120 \ 1 scan0216 | |
| The production and fitting of Chromidium brake drums for Bentley cars. | 1st Oct 1937 | Box 120 \ 1 scan0217 | |
| Instructions for rectifying a crackling Bentley rear brake drum. | 1st Oct 1937 | Box 120 \ 1 scan0218 | |
| The design, testing, and future production of Phantom III brake drums. | 4th Oct 1937 | Box 120 \ 1 scan0219 | |
| Standardisation report for brake drums, changing material from 'Millenite' to 'Chromidium' to reduce cost. | 31th Aug 1937 | Box 120 \ 1 scan0220 | |
| Cost estimation and production details for the standardisation of Bentley parts. | 21th Sep 1931 | Box 120 \ 1 scan0221 | |
| Laboratory report on the construction and analysis of a Lincoln Chassis brake drum. | 3rd Sep 1937 | Box 120 \ 1 scan0222 | |
| Analysis of foundry tests and the chemical composition of cast iron from a Lincoln drum. | 3rd Sep 1937 | Box 120 \ 1 scan0223 | |
| Laboratory report cover featuring a photograph of a sectioned metal component. | 20th Sep 1937 | Box 120 \ 1 scan0224 | |
| Comparative cost analysis between Die Cast Aluminium and Cast Iron brake drums for the Wraith III. | 20th Sep 1937 | Box 120 \ 1 scan0225 | |
| Brake drum cast on a steel centre plate. | 4th Oct 1937 | Box 120 \ 1 scan0226 | |
| Photograph of a brake drum cast on a steel centre plate. | 4th Oct 1937 | Box 120 \ 1 scan0227 | |
| Inquiry regarding the maximum skimming diameter for cast-iron brake drums on the Phantom II chassis. | 18th Oct 1937 | Box 120 \ 1 scan0228 | |
| Test results for brake drums cast with steel centre plates, including tensile strength, hardness, and micro-structure analysis. | 19th Oct 1937 | Box 120 \ 1 scan0229 | |
| Micrographs showing the structure of a cast iron brake drum cast on a steel centre plate. | 19th Oct 1937 | Box 120 \ 1 scan0230 | |
| Tensile strength and hardness test results for brake drums cast with steel centre plates. | 19th Oct 1937 | Box 120 \ 1 scan0231 | |
| Laboratory report with unetched and etched micrographs of a section from a cast iron brake drum. | 19th Oct 1937 | Box 120 \ 1 scan0232 | |
| Porous cast iron liners for Wraith aluminium brake drums. | 1st Oct 1937 | Box 120 \ 1 scan0233 | |
| Defective porous cast iron liners for Wraith aluminium brake drums. | 1st Oct 1937 | Box 120 \ 1 scan0234 | |
| Brake specifications for the first six production Wraith cars, detailing changes in design schemes for brake shoes and drums. | 22th Oct 1937 | Box 120 \ 1 scan0235 | |
| The fitting of auxiliary shoes and aluminium brake drums for the front of the Wraith III. | 27th Oct 1937 | Box 120 \ 1 scan0236 | |
| Modifications to the rear auxiliary brake shoes, springs, and dust excluders for the Wraith III model. | 27th Oct 1937 | Box 120 \ 1 scan0237 | |
| Modifications for fitting auxiliary brake shoes to the rear brakes with an aluminium brake drum for the Wraith III. | 27th Oct 1937 | Box 120 \ 1 scan0238 | |
| Potential weight savings on the Bentley 11A brakes by using different components and materials. | 28th Oct 1937 | Box 120 \ 1 scan0239 | |
| The maximum internal diameter for skimmed Phantom II and Phantom III brake drums. | 1st Nov 1937 | Box 120 \ 1 scan0240 | |
| Query regarding brake drum wear rates, final 'cut' dimensions, and scrapping limits for Phantom II and III models. | 3rd Nov 1937 | Box 120 \ 1 scan0241 | |
| Brake drum thickness, skimming depths, and wear for Phantom II and III models. | 4th Nov 1937 | Box 120 \ 1 scan0242 | |
| Standardisation report for front and rear brake drums made in Chromidium. | 14th Oct 1937 | Box 120 \ 1 scan0243 | |
| Standardisation of a front and rear brake drum for the Phantom III 'G' Series chassis. | 13th Oct 1937 | Box 120 \ 1 scan0244 | |
| Letter to Automotive Products Co. Ltd. requesting a fully dimensioned drawing of a casting. | 16th Nov 1937 | Box 120 \ 1 scan0245 | |
| Cost comparison between aluminium and iron brake drums for the Wraith model. | 16th Nov 1937 | Box 120 \ 1 scan0246 | |
| Technical memo comparing the use of aluminium and iron brake drums on various car models. | 19th Nov 1937 | Box 120 \ 1 scan0247 | |
| Comparative price for brake drums with cast-in end plates. | 23th Nov 1937 | Box 120 \ 1 scan0248 | |
| To cease work on Phantom III brake drums with cast-in end plates and investigate a new design. | 23th Nov 1937 | Box 120 \ 1 scan0249 | |
| Cost investigation comparing standard and new design Brake Drums for the Phantom III Chassis. | 23th Nov 1937 | Box 120 \ 1 scan0250 | |
| The factory cost saving for Phantom III brake drums with cast-in end plates. | 29th Nov 1937 | Box 120 \ 1 scan0251 | |
| Requesting the design and order of a set of brake drums with cast-in end plates for non-servo brakes. | 1st Dec 1937 | Box 120 \ 1 scan0252 | |
| Requirements for two sets of brake drums with cast-in end plates. | 11th Jan 1938 | Box 120 \ 1 scan0253 | |
| Requirements for two sets of brake drums with cast-in end plates. | 11th Jan 1938 | Box 120 \ 1 scan0254 | |
| Technical note on modifying the Bentley 111 front brake drums to resolve a lock restriction issue. | 26th Jan 1938 | Box 120 \ 1 scan0255 | |
| Brake drum failure due to incorrect braking proportion, the subsequent cracking of a replacement, and the implemented fix. | 1st Feb 1938 | Box 120 \ 1 scan0256 | |
| Blueprints for new flat end plates and brake drums for Bentley 11.A rear hubs, replacing older parts. | 3rd Feb 1938 | Box 120 \ 1 scan0257 | |
| Replacement of light alloy brake drums with cast iron drums, with instructions not to scrap the old parts. | 4th Feb 1938 | Box 120 \ 1 scan0258 | |
| Alteration note for a Bentley III front brake drum with a cast-in end plate. | 5th Feb 1938 | Box 120 \ 1 scan0259 | |
| The replacement of brake drum components for the Bentley 11A, introducing new flat end plates to save costs. | 7th Feb 1938 | Box 120 \ 1 scan0260 | |
| The replacement of brake drum and end plate components for the Bentley 11A. | 7th Feb 1938 | Box 120 \ 1 scan0261 | |
| Sourcing and modification of a Bentley brake drum for a brake lining test rig. | 7th Feb 1938 | Box 120 \ 1 scan0262 | |
| The modification of a wire wheel for wider front brake drums on a Bentley 111. | 7th Mar 1938 | Box 120 \ 1 scan0263 | |
| Casting defects in brake drums with steel back plates and proposing solutions. | 16th Mar 1938 | Box 120 \ 1 scan0264 | |
| Blueprint detailing brake drums with 'cast-in' mild steel back plates. | 16th Mar 1938 | Box 120 \ 1 scan0265 | |
| Design and production of brake drums with 'cast-in' steel back plates for material economy. | 17th Mar 1938 | Box 120 \ 1 scan0266 | |
| Brake drums, discussing American manufacturing practices and the economics of cast versus machined ribs. | 21th Mar 1938 | Box 120 \ 1 scan0267 | |
| Authorising the scrapping of obsolete aluminium front drums from a 25.G.VI model. | 30th Mar 1938 | Box 120 \ 1 scan0268 | |
| The results of fitting new brake drums with cast-in steel back plates onto a Phantom III. | 10th May 1938 | Box 120 \ 1 scan0269 | |
| The design and fitment of new aluminium drums for the Bentley III Continental model to save weight. | 1st Nov 1938 | Box 120 \ 1 scan0270 | |
| Obsolete brake drums loaned to Ferodo Ltd. | 7th Dec 1938 | Box 120 \ 1 scan0271 | |
| Design modifications for B.V. Series brake drums. | 4th Apr 1939 | Box 120 \ 1 scan0272 | |
| Letter to Templewood Eng. Co. Ltd. about the fitment of aluminium drums to the latest axles. | 6th Jun 1939 | Box 120 \ 1 scan0273 | |
| Letter from Templewood Engineering Co. Ltd. enquiring about alterations to experimental aluminium drums. | 8th Jun 1939 | Box 120 \ 1 scan0274 | |
| Letter to Templewood Eng. Co. Ltd. regarding a change in the shape of a back plate, enclosing drawing GB.4891. | 15th Jun 1939 | Box 120 \ 1 scan0275 | |
| Instruction to produce iron brake drums for Corniche cars as a contingency for issues with aluminium brakes. | 30th Jun 1939 | Box 120 \ 1 scan0276 | |
| Proposing the withdrawal of aluminium brake drums and liners from manufacture due to creeping issues. | 1st Jul 1939 | Box 120 \ 1 scan0277 | |
| The production of aluminium and iron brake drums, specifically for the 'Corniche' show cars. | 3rd Jul 1939 | Box 120 \ 1 scan0278 | |
| Error in manufacturing experimental brake drums, which were machined instead of cast, rendering them useless. | 21th Jul 1939 | Box 120 \ 1 scan0279 | |
| Mistake in casting Ripple drums and the arrangement for replacements. | 21th Jul 1939 | Box 120 \ 1 scan0280 | |
| Reducing the thickness of C.1 brake drum backplates and potential distortion issues. | 2nd Feb 1940 | Box 120 \ 1 scan0281 | |
| Reduction in thickness of brake drum backplates and associated distortion issues. | 6th Feb 1940 | Box 120 \ 1 scan0282 | |
| Casting specifications and experiments for brake drums with cast-in backplates. | 12th Feb 1940 | Box 120 \ 1 scan0283 | |
| Casting tolerances and distortion issues for brake drums with cast-in backplates. | 5th Mar 1940 | Box 120 \ 1 scan0284 | |
| Specification memo for brake drums on new axles, detailing dimensions and casting considerations. | 19th Mar 1940 | Box 120 \ 1 scan0285 | |
| Required List of Parts (LOP's) for a LH Silver Phantom chassis. | 27th Apr 1940 | Box 120 \ 1 scan0286 | |
| Request to place an order for a Solex Carburettor. | 9th Jul 1940 | Box 120 \ 1 scan0287 | |
| The position of the rationalised brake system, detailing issues and suggested experiments. | 4th Nov 1940 | Box 120 \ 1 scan0288 | |
| Issues with oil sealing, gearbox ingress, servo drives, and brake lining wear. | 4th Nov 1940 | Box 120 \ 1 scan0289 | |
| Suggested experiments for braking systems, including efficiency, cooling, and components. | 4th Nov 1940 | Box 120 \ 1 scan0290 | |
| Update on the difficulty of sourcing a Hispano Brake Drum, mentioning a supplier's premises were destroyed. | 4th Dec 1940 | Box 120 \ 1 scan0291 | |
| From Rm. to JLE. advising to forget about the Hispano brake drum as it is no longer needed. | 8th Dec 1940 | Box 120 \ 1 scan0292 | |
| Letter from High Duty Alloys Ltd. concerning light alloy brake drums and a Park Ward body. | 19th Dec 1940 | Box 120 \ 1 scan0293 | |
| Concluding page of a letter regarding the delivery of information. | 3rd Feb 1941 | Box 120 \ 1 scan0294 | |
| Issues with casting iron liners in aluminium brake drums, including splitting and bonding problems, and suggesting a test program. | 3rd Feb 1941 | Box 120 \ 1 scan0295 | |
| Outlining suggestions for improving the bond between drum and liner materials. | 3rd Feb 1941 | Box 120 \ 1 scan0296 | |
| Casting issues with iron liners in aluminium brake drums and a suggested test program. | 3rd Feb 1941 | Box 120 \ 1 scan0297 | |
| List of investigative actions for manufacturing drums and liners using high silicon alloys and different bonding methods. | 3rd Feb 1941 | Box 120 \ 1 scan0298 | |
| Brake drum temperatures and excessive wear on eight-cylinder cars, outlining potential solutions. | 21th Feb 1941 | Box 120 \ 1 scan0299 | |
| Brake performance issues, proposing modifications to drums and linings to manage heat. | 21th Feb 1941 | Box 120 \ 1 scan0300 | |
| Experiments and tests conducted to improve the cooling of brake drums. | 28th Feb 1941 | Box 120 \ 1 scan0301 | |
| Experimental procedure report on measuring brake drum temperature and cooling characteristics. | 28th Feb 1941 | Box 120 \ 1 scan0302 | |
| The effects of wheel discs and wheel cowls on brake drum cooling rates at different speeds. | 1st Jan 1928 | Box 120 \ 1 scan0303 | |
| Technical document detailing differences in wheel hub design and the method of fitting air deflectors with a diagram. | 28th Feb 1941 | Box 120 \ 1 scan0304 | |
| Temperature tests and cooling rate analysis of brake drums on the Comet and Cresta models. | 28th Feb 1941 | Box 120 \ 1 scan0305 | |
| Report page discussing brake temperatures and lining wear, including a description and diagram of a Buick brake drum. | 28th Feb 1941 | Box 120 \ 1 scan0306 | |
| Road tests and analysis of brake drum cooling performance. | 28th Feb 1941 | Box 120 \ 1 scan0307 | |
| Comparative study of cooling area calculations for three different drum designs. | 28th Feb 1941 | Box 120 \ 1 scan0308 | |
| Technical discussion on brake drum design, materials, and cooling improvements. | 28th Feb 1941 | Box 120 \ 1 scan0309 | |
| Graph showing brake drum cooling rates against car speed for various wheel configurations on a 10 BS chassis. | 12th Feb 1941 | Box 120 \ 1 scan0310 | |
| Graph plotting brake drum cooling rate against car speed for a 4G30 chassis under various configurations. | 12th Feb 1941 | Box 120 \ 1 scan0311 | |
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