| Description | Date | Identifier | |
| Modified servo drive, highlighting the need to monitor the central retaining screw during testing. | 29th Nov 1938 | Box 112 \ 1 scan0139 | |
| Request for a modification scheme to adapt an old servo driving shaft for a new detachable servo for rig testing. | 13th Dec 1938 | Box 112 \ 1 scan0140 | |
| Instruction regarding the fitting of 30° servo cams instead of 35° on future experimental chassis. | 13th Apr 1939 | Box 112 \ 1 scan0141 | |
| Removal of incorrect VG.90 servo discs from stores due to being supplied in the wrong material. | 7th Jun 1939 | Box 112 \ 1 scan0142 | |
| Request to reline a servo with genuine VG.90 material. | 24th Jun 1939 | Box 112 \ 1 scan0143 | |
| Scheme for fitting standard shock dampers to a Bentley 50, detailing necessary frame and exhaust modifications. | 24th May 1938 | Box 112 \ 2 scan0001 | |
| Order for one set of parts for a Gear Pump Assembly for experimental work on a rig. | 21th Jun 1938 | Box 112 \ 2 scan0002 | |
| Requesting the installation of rear shock dampers, which necessitates changing the petrol tank on car 1.B.50. | 20th Jul 1938 | Box 112 \ 2 scan0003 | |
| Depth of rear springs and shock dampers for Bentley V and Bentley 50 models. | 17th May 1939 | Box 112 \ 2 scan0004 | |
| Letter to The Dunlop Rim & Wheel Co. Ltd. inquiring about a pressed steel wheel with a knock-off centre lock. | 25th Oct 1937 | Box 112 \ 2 scan0005 | |
| Letter from Dunlop Rim & Wheel Co. Ltd. to arrange a meeting at the Works. | 27th Oct 1937 | Box 112 \ 2 scan0006 | |
| Letter from Dunlop Rubber Co. regarding the performance of Centre Lock wheels and proposals for alternative wheel designs. | 1st Nov 1937 | Box 112 \ 2 scan0007 | |
| Accompanying blueprints for pressed steel wheels and a tyre balancing scheme for the Bentley 11. | 5th Jan 1938 | Box 112 \ 2 scan0008 | |
| Blueprints for pressed steel wheels and associated parts for a Bentley 11.A. | 26th Jan 1938 | Box 112 \ 2 scan0009 | |
| Blueprints and parts for fitting Bentley 50 pressed steel wheels to a B.11.A front axle. | 26th Jan 1938 | Box 112 \ 2 scan0010 | |
| Blueprints for pressed steel wheels and rear hubs for a Bentley 11.A model. | 26th Jan 1938 | Box 112 \ 2 scan0011 | |
| Blueprints for fitting pressed steel wheels to a Bentley 50 front axle. | 26th Jan 1938 | Box 112 \ 2 scan0012 | |
| Blueprints and parts for fitting pressed steel wheels to a Bentley B.11A rear axle. | 26th Jan 1938 | Box 112 \ 2 scan0013 | |
| Parts for fitting Bentley 50 pressed steel wheels onto a B.11A rear axle. | 26th Jan 1938 | Box 112 \ 2 scan0014 | |
| Replacement blueprint for a wheel and tyre balancing device for Bentley 50 pressed steel wheels. | 26th Jan 1938 | Box 112 \ 2 scan0015 | |
| The application of pressed steel wheels for the front end of the B.50 car. | 5th May 1938 | Box 112 \ 2 scan0016 | |
| Quotation from British Tyre & Rubber Co. Ltd. for rubber edging of wheel discs. | 12th Oct 1938 | Box 112 \ 2 scan0017 | |
| Letter from British Tyre & Rubber Co., Ltd. concerning a quotation. | 12th Oct 1938 | Box 112 \ 2 scan0018 | |
| Confirming details about the weight and collection of a car body from Park Ward & Co. | 2nd May 1938 | Box 112 \ 2 scan0019 | |
| Communication regarding the estimated weight and collection arrangements for a car body from Park Ward & Co. | 2nd May 1938 | Box 112 \ 2 scan0020 | |
| Weight analysis of the first B.50 body. | 25th May 1938 | Box 112 \ 2 scan0021 | |
| Comparison of body weights for Wraith Limousine, Bentley 30, and touring saloon models. | 23th May 1938 | Box 112 \ 2 scan0022 | |
| The excessive weight of the first B-50 body and a protest to the coachbuilder Park Ward & Co. | 27th May 1938 | Box 112 \ 2 scan0023 | |
| Detailed weight analysis of a 1.B.50 body sent to Messrs. Park Ward & Co. | 8th Jun 1938 | Box 112 \ 2 scan0024 | |
| Letter from coachbuilders Park Ward & Co. Ltd. acknowledging a detailed weight analysis of coachwork. | 9th Jun 1938 | Box 112 \ 2 scan0025 | |
| Deductions on the weight of coachwork for model 1.B.50, comparing steel versus wood and aluminium construction. | 9th Jun 1938 | Box 112 \ 2 scan0026 | |
| Calculating the weight of coachwork with additions to a B.III body to create a B.50. | 27th Jun 1938 | Box 112 \ 2 scan0027 | |
| Complete weight analysis for model 1.B.50, detailing car, body, chassis, and various extras. | 27th Jun 1938 | Box 112 \ 2 scan0028 | |
| List of chassis weights for the Wraith and Phantom III models. | 20th Aug 1938 | Box 112 \ 2 scan0029 | |
| The complete car weights for the Wraith and Phantom III models. | 20th Aug 1938 | Box 112 \ 2 scan0030 | |
| Car body weights and referencing the Humber Snipe Imperial as a guide for dimensions. | 24th Oct 1938 | Box 112 \ 2 scan0031 | |
| The frame weights for the B.50 and Silver Wraith models. | 24th Oct 1938 | Box 112 \ 2 scan0032 | |
| The weight of a B.50 chassis and providing a comparison to a B.V. chassis. | 8th Mar 1939 | Box 112 \ 2 scan0033 | |
| Complete weight analysis of a vehicle, broken down by chassis, extras, and coachwork. | 5th Apr 1939 | Box 112 \ 2 scan0034 | |
| Visit to the company 'Numbers' to investigate the quietness and manufacturing process of their 'Phoenix' gearbox. | 15th Sep 1937 | Box 112 \ 2 scan0035 | |
| Humber's experience with cyanide hardened gears and a proposal for testing a Humber gearbox with a Rolls-Royce engine. | 15th Sep 1937 | Box 112 \ 2 scan0036 | |
| Visit to Humber to assess the quality of their cyanide hardened unground gearboxes for the Phoenix project. | 15th Sep 1937 | Box 112 \ 2 scan0037 | |
| Gear hardening processes and a proposal to test a Humber gearbox. | 15th Sep 1937 | Box 112 \ 2 scan0038 | |
| Rejecting a proposal to use a Humber gearbox with cyanide hardened gears due to noise concerns. | 23th Sep 1937 | Box 112 \ 2 scan0039 | |
| Cost reduction features of the Phoenix gearbox design. | 28th Sep 1937 | Box 112 \ 2 scan0040 | |
| Observations on gear grinding processes to achieve a cheaper transmission. | 28th Sep 1937 | Box 112 \ 2 scan0041 | |
| Use of Bentley first speed gears for the Phoenix gearbox to achieve silence. | 21th Oct 1937 | Box 112 \ 2 scan0042 | |
| Experiments and recommendations for the Bentley 50 gearbox, covering synchromesh, centre bearing, and integral sideshaft. | 22th Oct 1937 | Box 112 \ 2 scan0043 | |
| New drawing (PD.82) for the Bentley and Wraith gearbox layshafts, cancelling drawings PD.67 and PD.68. | 1st Dec 1937 | Box 112 \ 2 scan0044 | |
| Visit to the Gear Grinding Co. regarding issues with form grinding the B.50 gearbox layshaft pinion. | 13th Jan 1938 | Box 112 \ 2 scan0045 | |
| Results of testing ground versus unground gears in Bentley gearboxes. | 13th Jan 1938 | Box 112 \ 2 scan0046 | |
| Potential fitting of a B.50 gearbox with overdrive to the Wraith model. | 1st Mar 1938 | Box 112 \ 2 scan0047 | |
| The arrangement of a fully isolated gear change lever mechanism for the Bentley 50. | 11th Apr 1938 | Box 112 \ 2 scan0048 | |
| Rejecting a suggestion to make a gearbox casting in iron due to the significant weight increase compared to aluminium. | 16th May 1938 | Box 112 \ 2 scan0049 | |
| Fitting a Bentley 50 gearbox to chassis 5.B.IV for a dynamometer run. | 30th May 1938 | Box 112 \ 2 scan0050 | |
| List of points and suggestions noted during the assembly of the Bentley 50 gearbox. | 30th May 1938 | Box 112 \ 2 scan0051 | |
| List of suggested amendments and observations on various engineering components and drawings. | 30th May 1938 | Box 112 \ 2 scan0052 | |
| Assembly schedule for the Bentley 50 gearbox. | 30th May 1938 | Box 112 \ 2 scan0053 | |
| Page of assembly instructions for a gearbox, detailing the fitting of shafts, gears, and levers. | 30th May 1938 | Box 112 \ 2 scan0054 | |
| Assembly instructions for fitting covers, a damper control pump, and a clutch case. | 30th May 1938 | Box 112 \ 2 scan0055 | |
| Rig testing and future specifications for the Bentley 50 small gearbox. | 13th Jun 1938 | Box 112 \ 2 scan0056 | |
| Requesting a new reverse shaft for a B.50 gearbox due to the original being bent. | 1st Jul 1938 | Box 112 \ 2 scan0057 | |
| Technical memorandum regarding modifications and testing procedures for the 1.B.50 gearbox to prevent gears from disengaging. | 5th Jul 1938 | Box 112 \ 2 scan0058 | |
| Series of sixteen numbered responses to queries concerning a B.50 gearbox. | 5th Jul 1938 | Box 112 \ 2 scan0059 | |
| Typed memo detailing design considerations for a shaft, oil seal, and adjustable fulcrum pins. | 5th Jul 1938 | Box 112 \ 2 scan0060 | |
| Modifications to a Bentley 50 gearbox reverse shaft. | 7th Jul 1938 | Box 112 \ 2 scan0061 | |
| Modifications required for a dynamometer gearbox. | 14th Jul 1938 | Box 112 \ 2 scan0062 | |
| Blueprint for the Bentley 50, detailing a scheme to prevent the reverse gear from working out of mesh. | 20th Jul 1938 | Box 112 \ 2 scan0063 | |
| Specification for modifications to the B.50 gearbox for an existing car (8.B.V.) and future new cars. | 21th Jul 1938 | Box 112 \ 2 scan0064 | |
| List of required modifications and details for a gearbox, including notes on parts for testing. | 21th Jul 1938 | Box 112 \ 2 scan0065 | |
| Troubles with the B.50 gearbox, specifically reverse gear and 2nd speed synchro issues. | 22th Jul 1938 | Box 112 \ 2 scan0066 | |
| Request to manufacture two blanks for a half servo worm wheel for a B.50 gearbox. | 22th Jul 1938 | Box 112 \ 2 scan0067 | |
| Requesting a modification to the slant of a reverse shaft in a B.50 gearbox. | 5th Aug 1938 | Box 112 \ 2 scan0068 | |
| Modifications for a gearbox intended for a French test. | 9th Aug 1938 | Box 112 \ 2 scan0069 | |
| List of modifications required for Gearbox B.III No.1 for 8.B.V. | 11th Aug 1938 | Box 112 \ 2 scan0070 | |
| Requesting the modification of a B.50 Gearbox (B.3 No.2) to change the top and overdrive cone angles. | 28th Sep 1938 | Box 112 \ 2 scan0071 | |
| List of five modifications and instructions for the B.50 Gearbox B.3 No.2. | 3rd Oct 1938 | Box 112 \ 2 scan0072 | |
| Request for drawings of experimental modifications to the B.50 gearbox. | 10th Oct 1938 | Box 112 \ 2 scan0073 | |
| Modifications and parts required for new B.50 gearboxes. | 17th Oct 1938 | Box 112 \ 2 scan0074 | |
| The preparation of aluminium bronze pieces for a gearbox modification. | 8th Nov 1938 | Box 112 \ 2 scan0075 | |
| Instruction to experimentally try Vauxhall type springs in the synchromesh of the B.50 Gearbox. | 12th Nov 1936 | Box 112 \ 2 scan0076 | |
| Modifications required for the B.50 gearbox. | 22th Dec 1938 | Box 112 \ 2 scan0077 | |
| Modifications for Gearbox B.3 No.3 for car 1.B.50. | 24th Nov 1938 | Box 112 \ 2 scan0078 | |
| Requesting three experiments to be carried out on a B.50 gearbox to reduce noise. | 2nd Jan 1939 | Box 112 \ 2 scan0079 | |
| B.50 gearbox issue where 2nd speed gears disengage, proposing an experimental fix based on blueprints. | 13th Jan 1939 | Box 112 \ 2 scan0080 | |
| Use of square roller bearings in a B.50 type gearbox, replacing previous needle bearings. | 17th Jan 1939 | Box 112 \ 2 scan0081 | |
| Blueprint FD.360, seeking an opinion on the possibility of grinding the first speed pinion for the Bentley 50 gearbox. | 20th Jan 1939 | Box 112 \ 2 scan0082 | |
| Machining and grinding of the B.50 gearbox. | 28th Jan 1939 | Box 112 \ 2 scan0083 | |
| Production and grinding difficulties of a proposed five-gear motion shaft for the Bentley 50 gearbox. | 31th Jan 1939 | Box 112 \ 2 scan0084 | |
| High costs associated with production and potential scrap. | 6th Feb 1939 | Box 112 \ 2 scan0085 | |
| Technical memorandum discussing modifications and manufacturing options for the B.50 gearbox, specifically the reverse and first speed gears. | 6th Feb 1939 | Box 112 \ 2 scan0086 | |
| Clarifying test requirements for the B.50 gearbox, including modifications for shafts and reverse gear placement. | 3rd Feb 1939 | Box 112 \ 2 scan0087 | |
| B.50 Gearbox Actuating Forks fitted with Axial Roller Bearings and a request for parts. | 8th Mar 1939 | Box 112 \ 2 scan0088 | |
| Requesting the manufacture of six All Helical B.50 gearboxes, specifying ratio configurations and a potential material change for the forks. | 17th Mar 1939 | Box 112 \ 2 scan0089 | |
| Gearbox bearing issues and erratic engine idling on the B.50 model. | 25th Feb 1940 | Box 112 \ 2 scan0090 | |
| The testing done on the E.50 gearbox, detailing design changes and test results. | 23th Aug 1938 | Box 112 \ 2 scan0091 | |
| Results of gearbox testing under various conditions and with different lubricants. | 3rd Jun 1938 | Box 112 \ 2 scan0092 | |
| Progress report on gearbox development, detailing issues with gears, synchromesh, and oil leaks. | 23th Aug 1938 | Box 112 \ 2 scan0093 | |
| Use of the B.50 frame to replace the Wraith, and the necessary specifications for axles, springs, and transmission. | 29th Nov 1937 | Box 112 \ 2 scan0094 | |
| Cost comparison table for parts between Bentley II and Bentley III, detailing material and labour expenses. | 6th Dec 1937 | Box 112 \ 2 scan0095 | |
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