| Description | Date | Identifier | |
| Material requirements for the Bentley Contact Breaker Spring. | 21th Jun 1933 | Box 3 \ 4 04-page343 | |
| Performance comparison graph for various Peregrine engine cylinder head configurations. | 22th Jun 1933 | Box 3 \ 4 04-page344 | |
| Outlining the desired specification for the 3 1/2 Litre Bentley sports car. | 22th Jun 1933 | Box 3 \ 4 04-page345 | |
| Report addressing criticisms of a car's performance, discussing design requirements, and comparing engine options. | 22th Jun 1935 | Box 3 \ 4 04-page346 | |
| The future of superchargers and a review of criticisms on their own car production. | 22th Jun 1933 | Box 3 \ 4 04-page347 | |
| Short memo confirming receipt of a previous letter and arrangements for a Bentley car to be brought up for discussion. | 22th Jun 1933 | Box 3 \ 4 04-page348 | |
| Use of alloy steel versus carbon steel for Bentley contact breaker springs and issues with tempering. | 22th Jun 1933 | Box 3 \ 4 04-page349 | |
| The progress on modifications for the Peregrine and Bentley chassis. | 22th Jun 1933 | Box 3 \ 4 04-page350 | |
| Customer expectations for a racing version of the 3½ Litre Bentley and the company's position. | 22th Jun 1933 | Box 3 \ 4 04-page351 | |
| Extract from a publication describing the performance and design of the new Bentley at the Brooklands circuit. | 1st Jun 1933 | Box 3 \ 4 04-page352 | |
| Failure and material properties of a Bentley Contact Breaker Spring. | 23th Jun 1933 | Box 3 \ 4 04-page353 | |
| Arranging a test drive for two 3 1/2 litre Bentley models, a green car and an open car. | 23th Jun 1933 | Box 3 \ 4 04-page354 | |
| Bentley tests on Brooklands track covering axle ratio, wings, and exhaust performance. | 23th Jun 1933 | Box 3 \ 4 04-page355 | |
| Summary of comparative car performance tests with a table of results and a list of further test variations. | 23th Aug 1933 | Box 3 \ 4 04-page356 | |
| Performance graph and specifications for a Bentley Chassis 3 B R, Unit B N°2. | 23th Jun 1933 | Box 3 \ 4 04-page357 | |
| Performance graph showing Brake Horsepower against Engine R.P.M. for a Bentley Chassis 4-B.19, Unit B N°3. | 24th Jun 1933 | Box 3 \ 4 04-page358 | |
| Performance graph and specifications for a Bentley Chassis 2.B.N Unit B No 1. | 28th Jun 1933 | Box 3 \ 4 04-page359 | |
| Performance graph and specifications for a Bentley Chassis B.17 (Unit B.4). | 1st Jul 1938 | Box 3 \ 4 04-page360 | |
| Blueprint graph showing performance comparisons for a Bentley exhaust system with different baffling configurations. | 12th Jul 1935 | Box 3 \ 4 04-page361 | |
| Arranging a road test and comparison between two 2.5 Litre Bentley cars at Brooklands. | 23th Jun 1933 | Box 3 \ 4 04-page362 | |
| New 3½-Litre Bentley, its unsuitability for racing, and the 'Rolls-Bentley' name. | 27th Jun 1933 | Box 3 \ 4 04-page363 | |
| Early development decisions and market positioning for the 3½-Litre Bentley. | 27th Jun 1933 | Box 3 \ 4 04-page364 | |
| Car noise levels, competition with Bentley, and steering stability issues. | 27th Jun 1933 | Box 3 \ 4 04-page365 | |
| Desired characteristics of the 3.5 Litre Bentley, balancing noise, comfort, and performance. | 27th Jun 1933 | Box 3 \ 4 04-page366 | |
| Testing replacement springs for a Bentley centre radiator mounting to eliminate bonnet knocks. | 27th Jun 1933 | Box 3 \ 4 04-page367 | |
| Performance, quietness, and development philosophy of the 3½-Litre Bentley. | 28th Jun 1933 | Box 3 \ 4 04-page368 | |
| Query regarding the correct oils to be used for a 3½ Litre Bentley chassis. | 28th Jun 1933 | Box 3 \ 4 04-page369 | |
| Timing tests and recommendations for Bensport engines. | 29th Jun 1933 | Box 3 \ 4 04-page370 | |
| Difficulty in timing Bentley engines and a proposed solution. | 1st Jul 1933 | Box 3 \ 4 04-page371 | |
| Design changes to Bentley parts to differentiate them from Rolls-Royce components. | 1st Jul 1933 | Box 3 \ 4 04-page372 | |
| Multiple mechanical issues found during a test drive of an Open Bentley, including overheating, engine clatter, and a loose flywheel. | 3rd Jul 1933 | Box 3 \ 4 04-page373 | |
| Investigating a flywheel failure on an Open Bentley caused by engine over-revving. | 1st Jul 1933 | Box 3 \ 4 04-page374 | |
| The marking of the revolution counter on production cars. | 4th Jul 1933 | Box 3 \ 4 04-page375 | |
| Results of Bentley car tests at Brooklands and points for improvement. | 4th Jul 1933 | Box 3 \ 4 04-page376 | |
| Agreement regarding the design and painting of the radiator grille. | 4th Jul 1933 | Box 3 \ 4 04-page377 | |
| The maximum speed testing of three 3.5 Litre Bentley cars at Brooklands Track, comparing different wing types. | 4th Jul 1933 | Box 3 \ 4 04-page378 | |
| Maximum speeds recorded and speedometer corrections for several cars. | 4th Jul 1933 | Box 3 \ 4 04-page379 | |
| Recommended oils for the 3 1/2 litre Bentley. | 4th Jul 1933 | Box 3 \ 4 04-page380 | |
| The extra cost in bonus hours and materials for making Rocker Cover and Tappet Cover Nuts for the Bentley 3½ Litre. | 4th Jul 1933 | Box 3 \ 4 04-page381 | |
| Modifying Bentley filler caps with a medallion from wheel nuts for interchangeability with 20-HP and Phantom models. | 4th Jul 1933 | Box 3 \ 4 04-page382 | |
| Release and proposed alteration of a spare ignition coil bracket for a Bentley. | 4th Jul 1933 | Box 3 \ 4 04-page383 | |
| Follow-up letter discussing the performance and rev limits of an Open Bentley during a test drive. | 7th Aug 1933 | Box 3 \ 4 04-page384 | |
| Flywheel adjustments and a test drive of an Open Bentley before a trip to France. | 5th Jul 1933 | Box 3 \ 4 04-page385 | |
| The selection and ordering of sparking plugs for the 3½ Litre Bentley engine. | 6th Jul 1933 | Box 3 \ 4 04-page386 | |
| Polished finish for the 'Bentley' name on the engine valve cover for cars at Brooklands. | 4th Jul 1938 | Box 3 \ 4 04-page387 | |
| Serious danger of over-revving the Bentley engine and seeking effective solutions beyond a red mark on the revolution counter. | 7th Jul 1933 | Box 3 \ 4 04-page388 | |
| The selection of sparking plugs for the 3 1/4 Litre Bentley. | 7th Jul 1933 | Box 3 \ 4 04-page389 | |
| The flexibility of a spare ignition coil bracket for a Bentley, clearing it for production. | 8th Jul 1933 | Box 3 \ 4 04-page390 | |
| Test drive report and critique of an Open Bentley, comparing its performance to the 40/50 Continental. | 11th Jul 1935 | Box 3 \ 4 04-page391 | |
| List of suggestions and critiques concerning the bodywork and interior of a car, covering safety and design improvements. | 11th Jul 1938 | Box 3 \ 4 04-page392 | |
| Report discussing potential car design improvements, body styles, and performance results. | 11th Jul 1932 | Box 3 \ 4 04-page393 | |
| Request for the complete weight of a production chassis and car for the Bentley Guarantee. | 26th Jul 1933 | Box 3 \ 4 04-page394 | |
| Potential change to the Bentley 'B' emblem to a Winchester italic design. | 25th Jul 1932 | Box 3 \ 4 04-page395 | |
| Modifications and improvements to the Bentley starter motor. | 12th Jul 1933 | Box 3 \ 4 04-page396 | |
| Proposing a meeting to discuss a 10,000-mile test for the 3 1/2 litre Bentley. | 12th Jul 1933 | Box 3 \ 4 04-page397 | |
| Improved fixing of the flywheel on the Bentley car and the associated risks. | 12th Jul 1938 | Box 3 \ 4 04-page398 | |
| Outlining proposed modifications and improvements for the 3½ Litre Bentley second series. | 13th Jul 1933 | Box 3 \ 4 04-page399 | |
| List of proposed modifications and tests for a vehicle, covering points 5 to 11 on steering, gears, brakes, and more. | 18th Jul 1933 | Box 3 \ 4 04-page400 | |
| Proposed modifications and tests for a car, including compression ratio, rear axle oil leaks, and radiator design. | 13th Jul 1933 | Box 3 \ 4 04-page401 | |
| Crankshafts, flywheels and the production status of the 3 1/2-Litre Bentley Car. | 13th Jul 1933 | Box 3 \ 4 04-page402 | |
| Confirming a meeting arrangement for the 10,000 miles test on a 3 1/2-Litre Bentley. | 13th Jul 1933 | Box 3 \ 4 04-page403 | |
| List of outstanding design changes and information required for the 3.5 Litre Bentley Chassis. | 14th Jul 1933 | Box 3 \ 4 04-page404 | |
| Introduction of new features on the 3½-Litre Bentley and the importance of maintaining brand hierarchy. | 14th Jul 1933 | Box 3 \ 4 04-page405 | |
| Concerns about the development focus between the Phantom II, 25 HP, and Bentley models. | 15th Jul 1933 | Box 3 \ 4 04-page406 | |
| Request for information on two outstanding modifications for the 15th Bentley Chassis. | 15th Jul 1933 | Box 3 \ 4 04-page407 | |
| Modifications and specifications for the exhaust system and side steering tube springs. | 17th Jul 1933 | Box 3 \ 4 04-page408 | |
| Leverage alteration for the servo countershaft lever on early Bentley cars. | 17th Jul 1933 | Box 3 \ 4 04-page409 | |
| Modification to a Bentley rear expansion box to achieve silence with a fishtail under the rear axle. | 1st Jul 1931 | Box 3 \ 4 04-page410 | |
| Parts to be changed on the first 15 chassis of the 3½ Litre Bentley. | 19th Jul 1933 | Box 3 \ 4 04-page411 | |
| List of modifications and instructions for various vehicle components including the piston, carburetter, and clutch. | 19th Jul 1933 | Box 3 \ 4 04-page412 | |
| List of specifications and modifications for various car components including the rocker cover, ignition, petrol pipe, and brakes. | 19th Jul 1933 | Box 3 \ 4 04-page413 | |
| Fitting instructions for brake levers, spare coils, dashboard clips, and rocker cover nuts. | 19th Jul 1933 | Box 3 \ 4 04-page414 | |
| Troubles with modifications to a 10,000-mile production Bentley car, specifically the petrol system and gear lever knob. | 20th Jul 1933 | Box 3 \ 4 04-page415 | |
| Meeting to approve final details for the 3½ litre Bentley following a 10,000-mile test. | 20th Jul 1932 | Box 3 \ 4 04-page416 | |
| The acceptance test of the first production Bentley chassis. | 21th Jul 1933 | Box 3 \ 4 04-page417 | |
| The decision not to move the petrol tap to the offside of the dashboard. | 21th Jul 1933 | Box 3 \ 4 04-page418 | |
| Essential modifications for the first 15 chassis of the 3½ Litre Bentley. | 21th Jul 1933 | Box 3 \ 4 04-page419 | |
| List of modifications and instructions for various chassis components. | 21th Jul 1933 | Box 3 \ 4 04-page420 | |
| Forwarding a letter and arranging an urgent meeting about the dispatch of 15 cars before the holidays. | 21th Jul 1933 | Box 3 \ 4 04-page421 | |
| The results and issues from a 3 1/2 Litre Bentley test in France. | 20th Jul 1933 | Box 3 \ 4 04-page422 | |
| Faults found during a road test from Havre to Paris, including loose seats, a loose wing, and a noisy gear lever. | 22th Jul 1933 | Box 3 \ 4 04-page423 | |
| Withdrawing a suggestion to use Winchester italic for the Bentley 'B' on hub caps, in favor of matching the existing radiator emblem. | 22th Jul 1933 | Box 3 \ 4 04-page424 | |
| Finish specifications for a Bentley engine unit. | 22th Jul 1933 | Box 3 \ 4 04-page425 | |
| Design, engraving, and weight of detachable wheel nuts for a Bentley vehicle. | 26th Jul 1933 | Box 3 \ 4 04-page426 | |
| Photograph of a chrome-plated hexagonal switch knob with a 'B' logo. | 1st Feb 1936 | Box 3 \ 4 04-page427 | |
| From EV to HS regarding the shelving of the Bensport 100 M.P.H. car project, forwarding a rough sketch for feedback. | 1st Feb 1936 | Box 3 \ 4 04-page428 | |
| Blueprint detailing the design for a proposed 100 M.P.H. Bentley. | 11th Apr 1933 | Box 3 \ 4 04-page429 | |
| Record sheet for a Lucas & Martin Dynamo, detailing its assessment and outcome. | 8th Sep 1911 | Box 3 \ 5 05-page001 | |
| Test report on a lighting dynamo, noting issues with the mercury cut out and variations in current. | 17th May 1915 | Box 3 \ 5 05-page002 | |
| Performance of a lighting dynamo under half load. | 1st Oct 1911 | Box 3 \ 5 05-page003 | |
| Introduction explaining the necessity for a constant current output for electric lighting systems in vehicles. | 1st Oct 1911 | Box 3 \ 5 05-page004 | |
| Three methods of dynamo output regulation, advocating for the purely electrical system used in the T. & M. Dynamo. | 1st Oct 1911 | Box 3 \ 5 05-page005 | |
| Description of the T. & M. Dynamo, its construction, and the principle of its operation using a four-brush system. | 1st Oct 1911 | Box 3 \ 5 05-page006 | |
| The theory of operation for the T. & M. Dynamo. | 1st Oct 1911 | Box 3 \ 5 05-page007 | |
| Circuit diagrams for a dynamo charging and lighting system. | 1st Oct 1911 | Box 3 \ 5 05-page008 | |
| Page describing the armature reaction and self-regulating characteristics of a machine under varying speed and load. | 1st Oct 1911 | Box 3 \ 5 05-page009 | |
| Page explaining the T. & M. Patent Dynamo and its application in automobile lighting systems. | 1st Oct 1911 | Box 3 \ 5 05-page010 | |
| Performance graph showing Dynamo output in Amperes and Volts against Dynamo revolutions per minute. | 1st Oct 1911 | Box 3 \ 5 05-page011 | |
| Specifications and performance details for a T. & M. Patent Dynamo. | 19th Sep 1911 | Box 3 \ 5 05-page012 | |
| Departmental memo regarding the examination of the T. & M. Car Lighting system. | 19th Sep 1911 | Box 3 \ 5 05-page013 | |
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