| Description | Date | Identifier | |
| Two alternative suggestions for modifying the pinion nose bearing housing on a semi-floating rear axle to facilitate production. | 5th Sep 1938 | Box 111 \ 4 scan0059 | |
| Telegram received by telephone from Rochester, New York, regarding material SAE 4620 and the inspection of scored gears. | 10th Sep 1938 | Box 111 \ 4 scan0060 | |
| Telegram received by telephone regarding the inspection of scored gears and a request for assembly prints. | 10th Sep 1938 | Box 111 \ 4 scan0061 | |
| Letter from Gleason Works regarding scored hypoid gears and their material specifications. | 9th Sep 1938 | Box 111 \ 4 scan0062 | |
| Letter from Gleason Works concerning scored gears and an experimental axle deflection test. | 9th Sep 1938 | Box 111 \ 4 scan0063 | |
| Cablegram regarding SAE 4620 material and a request to return scored gears for inspection. | 10th Sep 1938 | Box 111 \ 4 scan0064 | |
| Letter to The Gleason Works discussing rear axle gear scoring during testing. | 12th Sep 1938 | Box 111 \ 4 scan0065 | |
| The return of a pair of failed rear axle gears to The Gleason Works in Rochester, N.Y., U.S.A. | 12th Sep 1938 | Box 111 \ 4 scan0066 | |
| Letter from a supplier (Gleason Works) regarding excessive tooth loads on hypoid gears and recommendations for design changes. | 24th Sep 1938 | Box 111 \ 4 scan0067 | |
| Cablegram from Gleason reporting excessive tooth loads and non-rigid mountings, requesting an axle for a deflection test. | 26th Sep 1938 | Box 111 \ 4 scan0068 | |
| Night letter cablegram to Gleasons in Rochester, NY, querying the successful dynamometer testing of an existing ring gear. | 29th Sep 1938 | Box 111 \ 4 scan0069 | |
| Cover page for a document about the best hypoid lubricant. | 30th Sep 1938 | Box 111 \ 4 scan0070 | |
| Semi-floating rear axle for the Bentley 50 chassis, referencing component interchangeability with the B.111 chassis. | 30th Sep 1938 | Box 111 \ 4 scan0071 | |
| Comparative cost of alternative schemes for a semi-floating rear axle based on a special roller bearing. | 30th Sep 1938 | Box 111 \ 4 scan0072 | |
| Quotation letter from The Hoffmann Manufacturing Co. Limited for the supply of special roller bearings. | 29th Sep 1938 | Box 111 \ 4 scan0073 | |
| Letter to Gleason Works detailing the results of various gear combination tests. | 4th Oct 1938 | Box 111 \ 4 scan0074 | |
| Letter to Gleason Works discussing ring gear and pinion specifications for a 12-cylinder axle. | 4th Oct 1938 | Box 111 \ 4 scan0075 | |
| Cablegram from Gleason to Roycar Derby, arranging a conference with Mr Smith. | 5th Oct 1938 | Box 111 \ 4 scan0076 | |
| Comparative factory cost analysis for two semi-floating rear axle schemes. | 4th Oct 1938 | Box 111 \ 4 scan0077 | |
| Decision to detail Scheme 2 for a semi-floating rear axle based on a cost comparison. | 10th Oct 1938 | Box 111 \ 4 scan0078 | |
| Static and vibration test report on Bentley 50 rear axle couplings, comparing a standard taper and a Barber-Colman taper spline. | 28th Oct 1938 | Box 111 \ 4 scan0079 | |
| Test report comparing standard tapers and splines under static and vibration loads. | 28th Oct 1938 | Box 111 \ 4 scan0080 | |
| Conclusion of a test report on the satisfactory performance of two couplings and their securing nuts. | 28th Oct 1938 | Box 111 \ 4 scan0081 | |
| Diagrams illustrating fretting on two types of rear axle couplings after a 330-hour endurance test. | 31th Oct 1938 | Box 111 \ 4 scan0082 | |
| Request to manufacture tapered packing pieces for testing the effect of tilting the rear axle on Bentley car 1.B.50. | 31th Oct 1938 | Box 111 \ 4 scan0083 | |
| Requesting the preparation of material blanks for two sets of offset gears for trial by Gleasons in America. | 3rd Nov 1938 | Box 111 \ 4 scan0084 | |
| Test report on the Bentley 50 rear axle, specifically concerning the differential gearbox's Belleville washer and Timken bearing. | 22th Nov 1938 | Box 111 \ 4 scan0085 | |
| Test report on the effect of a 'Belleville' spring washer on the removal load for a Bentley 50 rear axle. | 23th Nov 1938 | Box 111 \ 4 scan0086 | |
| The return of unsatisfactory gears to The Gleason Works for credit. | 28th Nov 1938 | Box 111 \ 4 scan0087 | |
| Letter from Gleason Works regarding the failure of a pair of hypoid gears due to overload during testing. | 16th Nov 1938 | Box 111 \ 4 scan0088 | |
| Apology letter to The Gleason Works regarding a misunderstanding about returned hypoid gears. | 29th Nov 1938 | Box 111 \ 4 scan0089 | |
| Attempt to get credit from Gleasons for incorrectly labelled faulty gears. | 29th Nov 1938 | Box 111 \ 4 scan0090 | |
| Credit dispute over gears returned to Gleasons of Rochester, N.Y., and related internal communication. | 30th Nov 1938 | Box 111 \ 4 scan0091 | |
| Short memo confirming the closure of a transaction. | 30th Nov 1938 | Box 111 \ 4 scan0092 | |
| Design and modifications for a semi-floating rear axle centre casing. | 3rd Dec 1938 | Box 111 \ 4 scan0093 | |
| Of the B.50 rear axle scheme for B.50 cars. | 5th Dec 1938 | Box 111 \ 4 scan0094 | |
| Correspondence regarding a claim for a refund of import duty on defective Gleason Gears returned to the supplier. | 8th Dec 1938 | Box 111 \ 4 scan0095 | |
| Letter from Customs & Excise regarding an application for repayment of duty on gears returned to U.S.A. suppliers. | 6th Dec 1938 | Box 111 \ 4 scan0096 | |
| Responding to questions from Customs authorities regarding a test on Gleason gears. | 16th Dec 1938 | Box 111 \ 4 scan0097 | |
| The test of a Bentley 50 gearbox in a Phantom III chassis. | 20th Dec 1938 | Box 111 \ 4 scan0098 | |
| Suggesting dimensions for the B.50 rear axle, specifically a 59' track and 40 mm half shafts. | 2nd Mar 1939 | Box 111 \ 4 scan0099 | |
| Particulars for five new semi-floating axles, model PD.312, including ratios, track widths, and brake types. | 9th Mar 1939 | Box 111 \ 4 scan0100 | |
| Production status and delays for various new rear axle components. | 18th Mar 1939 | Box 111 \ 4 scan0101 | |
| Modified oil seals, the machining of an axle, and requesting a final decision. | 18th Mar 1939 | Box 111 \ 4 scan0102 | |
| Request for blueprints and parts for a Bentley 50 chassis rear axle modification. | 13th Apr 1939 | Box 111 \ 4 scan0103 | |
| Request for blueprints and production of front axle yokes for a Bentley 50 chassis. | 22th Apr 1939 | Box 111 \ 4 scan0104 | |
| Endurance tests conducted on Bentley rear axle shafts, comparing them to a Cadillac shaft. | 16th May 1939 | Box 111 \ 4 scan0105 | |
| Test report on shaft and bearing wear and performance under various loads and speeds. | 16th May 1939 | Box 111 \ 4 scan0106 | |
| Sketch of wear on a Bentley rear axle shaft after being dismantled. | 30th Dec 1938 | Box 111 \ 4 scan0107 | |
| Sketch detailing wear on a bearing inner race and retaining collar from a B50 rear axle shaft test. | 30th Dec 1938 | Box 111 \ 4 scan0108 | |
| Bentley III rear axle shaft and bearing test results. | 30th Mar 1939 | Box 111 \ 4 scan0109 | |
| Test report on an Acme thread oil seal for a Bentley 50 rear axle. | 1st Jun 1939 | Box 111 \ 4 scan0110 | |
| Leakage tests of a shaft seal under varying pressure and temperature conditions. | 1st Jun 1939 | Box 111 \ 4 scan0111 | |
| Graph showing the results of an Acme thread test for B50 rear axle oil seals, measuring leakage variation with pressure and shaft speed. | 2nd May 1939 | Box 111 \ 4 scan0112 | |
| Graph plotting leakage against shaft speed from an Acme thread test on B50 rear axle oil seals. | 1st May 1939 | Box 111 \ 4 scan0113 | |
| Graph plotting leakage against shaft speed at various temperatures for an Acme thread test on B.50 rear axle oil seals. | 2nd May 1939 | Box 111 \ 4 scan0114 | |
| Internal request to order various road springs for Bentley V & 50 cars. | 31th Mar 1939 | Box 111 \ 4 scan0115 | |
| Proposing to build a new frame for a 4.B.50 chassis to accommodate an eight-cylinder engine. | 23th Dec 1938 | Box 111 \ 4 scan0116 | |
| The filing of coachwork design PD.323 for the 'Lagonda Chaser' chassis 4.B.50. | 28th Dec 1938 | Box 111 \ 4 scan0117 | |
| Specification sheet for the Bentley 'Chaser' model, detailing components and modifications. | 29th Dec 1938 | Box 111 \ 4 scan0118 | |
| Specification sheet detailing various chassis and component parts. | 29th Dec 1938 | Box 111 \ 4 scan0119 | |
| Status update list for various vehicle components including steering, water pump, and flywheel. | 29th Dec 1938 | Box 111 \ 4 scan0120 | |
| Specification sheet outlining modifications and instructions for various vehicle components. | 29th Dec 1938 | Box 111 \ 4 scan0121 | |
| List of electrical components and their associated part numbers or current status. | 29th Dec 1938 | Box 111 \ 4 scan0122 | |
| Deferring the decision on rim fittings, lubrication hoses, and their fittings. | 29th Dec 1938 | Box 111 \ 4 scan0123 | |
| Internal memorandum to place an order for a Bentley 50 Radiator with Messrs. John Marston Ltd. | 30th Dec 1938 | Box 111 \ 4 scan0124 | |
| The preparation and dispatch of parts for a chassis frame to John Thompsons. | 17th Jan 1939 | Box 111 \ 4 scan0125 | |
| Petrol tank capacity and weight for the Bentley Cresta, specifically for continental touring. | 25th Jan 1939 | Box 111 \ 4 scan0126 | |
| Appendix page comparing the weight and capacity calculations for Continental B.5. and Bentley Cresta tanks. | 26th Jan 1939 | Box 111 \ 4 scan0127 | |
| Petrol tank capacity and fuel consumption for the Bentley Cresta. | 26th Jan 1939 | Box 111 \ 4 scan0128 | |
| Petrol tank support for the Bentley Cresta, detailing the fitting of a Corniche tank and alternative support methods. | 10th Feb 1939 | Box 111 \ 4 scan0129 | |
| Confirming the use of B.V. yokes on car 4.B.50 for a narrow front track. | 4th Mar 1939 | Box 111 \ 4 scan0130 | |
| Secret and confidential letter to Park Ward & Co. Ltd. about the design of a new Bentley 'Cresta' type chassis and body. | 20th Mar 1939 | Box 111 \ 4 scan0131 | |
| Confirming the dispatch of coachwork design PD.371 and the placement of an order for the first Bentley 'Cresta' 4.B.50 body. | 20th Mar 1939 | Box 111 \ 4 scan0132 | |
| Specification of coachwork for a Four Door Four Light Saloon, the Bentley 'Cresta'. | 20th Mar 1939 | Box 111 \ 4 scan0133 | |
| Specification document detailing various car body and interior features. | 20th Mar 1939 | Box 111 \ 4 scan0134 | |
| Specification sheet detailing various vehicle components, fittings, and their requirements. | 21th Mar 1939 | Box 111 \ 4 scan0135 | |
| Letter to coachbuilder Park Ward & Co. Ltd. detailing chassis specifications for a 4.B.50 'Cresta' model. | 21th Mar 1939 | Box 111 \ 4 scan0136 | |
| List of vehicle components with updates on their corresponding design schemes and drawing references. | 21th Mar 1939 | Box 111 \ 4 scan0137 | |
| Specification sheet detailing the instrument board, bonnet eye, spare wheel housing, and chassis construction. | 24th Mar 1939 | Box 111 \ 4 scan0138 | |
| Specifications for a gearbox and axle. | 24th Mar 1939 | Box 111 \ 4 scan0139 | |
| Letter to Park Ward & Co. Ltd. detailing specifications and agreements for a Bentley Cresta 4.B.50. | 25th Mar 1939 | Box 111 \ 4 scan0140 | |
| From the Chief Engineer regarding the deletion of the rear seat arm-rest's concealing flap. | 6th Apr 1939 | Box 111 \ 4 scan0141 | |
| Scheme showing the Bentley 'Cresta' front wheel clearance at full bump and lock. | 6th Apr 1939 | Box 111 \ 4 scan0142 | |
| Requesting particulars for a radiator and bonnet to progress with a car build. | 19th Apr 1939 | Box 111 \ 4 scan0143 | |
| The design progress and timeline for the new 4.B.50 radiator. | 20th Apr 1939 | Box 111 \ 4 scan0144 | |
| Modifications and drawings for the 'Cresta' Radiator, Wingstays, Horns, and Front Apron. | 26th Apr 1939 | Box 111 \ 4 scan0145 | |
| Letter sent to Park Ward & Co. Ltd. enclosing blueprints for Chassis 4.B.50 (Cresta). | 2nd May 1939 | Box 111 \ 4 scan0146 | |
| Letter to coachbuilder Park Ward & Co. Ltd. specifying paint, interior, and body details for a Bentley 'Cresta' car. | 12th May 1939 | Box 111 \ 4 scan0147 | |
| Arranging the transport of an experimental dummy chassis to Park Wards and the return of a complete body. | 17th May 1939 | Box 111 \ 4 scan0148 | |
| The schedule for issuing drawings for the radiator, shutters, and bonnet for a 'long distance job'. | 23th May 1939 | Box 111 \ 4 scan0149 | |
| Delayed receipt of drawings for a Bentley 4.B.50 'Cresta' Radiator and Bonnet. | 23th May 1939 | Box 111 \ 4 scan0150 | |
| The standardisation of a 3/4° castor angle for B.V. steering systems and the preparation of required parts. | 23th May 1939 | Box 111 \ 4 scan0151 | |
| Confidential letter to Park Ward & Co. Ltd requesting details for the front headlamp design on chassis 4.B.50 - Cresta. | 23th May 1939 | Box 111 \ 4 scan0152 | |
| Letter to a coachbuilder regarding the approval of paintwork and interior trim samples. | 27th May 1939 | Box 111 \ 4 scan0153 | |
| Letter sent to Messrs. Park Ward & Co. Ltd. regarding blueprints for the bonnet of chassis 4.B.50 (Cresta). | 27th May 1939 | Box 111 \ 4 scan0154 | |
| Confidential letter to coachbuilder Park Ward & Co. Ltd. regarding chassis blueprints for the 4.B.50 (Cresta) model. | 27th May 1939 | Box 111 \ 4 scan0155 | |
| Letter to Park Ward & Co. Ltd. thanking them for a Cresta front wing model section and various tracings. | 8th Jun 1939 | Box 111 \ 4 scan0156 | |
| Letter confirming an agreement to add a stiffening plate to chassis 4.B.50 - Cresta. | 9th Jun 1939 | Box 111 \ 4 scan0157 | |
| Confidential letter to Park Ward & Co. Ltd. detailing modifications for a Bentley mock-up radiator shell. | 21th Jun 1939 | Box 111 \ 4 scan0158 | |
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