| Description | Date | Identifier | |
| Preliminary cooling tests and radiator matrix suitability for various car models. | 29th Mar 1938 | Box 112 \ 1 scan0039 | |
| Recommendation to revise the 'Standard of Cooling' by changing radiator matrix specifications for models B.III and B.50. | 27th Sep 1930 | Box 112 \ 1 scan0040 | |
| Official order be placed with Messrs. Marstons for two B.50 radiator shells. | 29th Mar 1938 | Box 112 \ 1 scan0041 | |
| Radiator matrix specifications and a related drawing for model 1-B-50. | 9th Apr 1938 | Box 112 \ 1 scan0042 | |
| Radiator mounting for a Bentley 50. | 11th Apr 1938 | Box 112 \ 1 scan0043 | |
| Particulars for the yoke and matrix support frame of the lower half of the B.50 radiator, referencing Chevrolet practice. | 11th Apr 1938 | Box 112 \ 1 scan0044 | |
| Construction of the radiator shell and grille for model 1-B-50. | 11th Apr 1938 | Box 112 \ 1 scan0045 | |
| New, trial cost-reduction method for attaching the wing tie bar to the Bentley 50 Radiator Yoke. | 13th Apr 1938 | Box 112 \ 1 scan0046 | |
| New design for the Bentley 50 radiator, referencing drawing FD.151 and potential shimmy issues. | 13th Apr 1938 | Box 112 \ 1 scan0047 | |
| The despatch of a B.50 radiator shell and grille to Messrs Park, Ward & Co. Ltd. | 21th Apr 1938 | Box 112 \ 1 scan0048 | |
| The shape of a radiator filling plate, providing drawing PD.161 for clarification. | 21th Apr 1938 | Box 112 \ 1 scan0049 | |
| List of blueprints for new parts for the Bentley 50 Chassis radiator, supplied to Marstons Limited. | 29th Apr 1938 | Box 112 \ 1 scan0050 | |
| List of new blueprints and details for the Radiator & Fittings on the Bentley 50 Chassis, Section 5250. | 6th May 1938 | Box 112 \ 1 scan0051 | |
| Note clarifying which parts are supplied by a third-party, Messrs. John Marston & Co. Ltd. | 6th May 1938 | Box 112 \ 1 scan0052 | |
| Providing blueprints for a Bentley 50 Chassis water connection part. | 12th May 1938 | Box 112 \ 1 scan0053 | |
| Filing note for the obsolete original design of the Bentley 50 Radiator. | 16th May 1938 | Box 112 \ 1 scan0054 | |
| The procurement and modification of water hose connections for B.III and B.50 chassis. | 25th May 1938 | Box 112 \ 1 scan0055 | |
| Non-usable radiator shell for the B.50 radiator, returned to the Experimental Department. | 13th Jun 1938 | Box 112 \ 1 scan0056 | |
| Order of radiator mounting blocks from Firestone Ltd. | 24th Jun 1938 | Box 112 \ 1 scan0057 | |
| Revised drawings and parts lists for the Bentley 50 Chassis radiator and shutters. | 5th Jul 1938 | Box 112 \ 1 scan0058 | |
| Revised design for the Bentley 50 radiator shell, reverting to a previous top configuration. | 8th Sep 1938 | Box 112 \ 1 scan0059 | |
| Specifying the required durometer hardness for radiator mounting blocks. | 1st Nov 1938 | Box 112 \ 1 scan0060 | |
| Requesting a B.50 mock-up radiator and associated parts to be made for a sales mock-up car. | 15th Nov 1938 | Box 112 \ 1 scan0061 | |
| The fitting scheme for B.V. and B.50 bonnets. | 16th Jan 1939 | Box 112 \ 1 scan0062 | |
| Alteration notice detailing updated parts for headlamp, radiator, and shutter components on a Bentley 50 (Expl) model. | 27th Feb 1939 | Box 112 \ 1 scan0063 | |
| Alteration sheet detailing part changes for the Bentley 50 (Expl) Radiator & Shutters, sheet 2. | 27th Feb 1939 | Box 112 \ 1 scan0064 | |
| Alteration sheet detailing changes to washers, clips, pins, and packing for the Bentley 50 model's Radiator & Shutters. | 27th Feb 1939 | Box 112 \ 1 scan0065 | |
| Secret memo discussing rear suspension rebound issues and proposed experiments for the Phoenix and Bentley III models. | 24th May 1937 | Box 112 \ 1 scan0066 | |
| Camber and caster adjustments for the Packard type front suspension on Bentley III and Phoenix models. | 23th Jun 1937 | Box 112 \ 1 scan0067 | |
| Page 2 of a memo discussing an investigation into a packing piece and a related manufacturing and inspection scheme. | 24th Dec 1937 | Box 112 \ 1 scan0068 | |
| Investigation into using 50-inch rear road springs for the B.50 Family Saloon. | 24th Dec 1937 | Box 112 \ 1 scan0069 | |
| Calculations for weight distribution and spring weights of a B.50 Family Saloon. | 24th Dec 1937 | Box 112 \ 1 scan0070 | |
| Data table comparing specifications for rear road springs across various car models. | 7th Jan 1938 | Box 112 \ 1 scan0071 | |
| Specifications and suitability of rear road springs for the Bentley 50. | 7th Jan 1938 | Box 112 \ 1 scan0072 | |
| Analyzing the fatigue stress and safety factor of vehicle leaf springs. | 7th Jan 1938 | Box 112 \ 1 scan0073 | |
| Table comparing the specifications of springs for various car models. | 30th Dec 1937 | Box 112 \ 1 scan0074 | |
| Graph showing the relationship between stress range and mean stress for Silicon Manganese Spring Steel for 10,000,000 stress reversals. | 30th Dec 1937 | Box 112 \ 1 scan0075 | |
| Design and specifications for the front springs of the Bentley 50 car. | 1st Feb 1938 | Box 112 \ 1 scan0076 | |
| Design and specifications for the front springs of the Bentley 50 car. | 2nd Feb 1938 | Box 112 \ 1 scan0077 | |
| Issuance of blueprints for Bentley 50 chassis rear springs for quotation purposes. | 4th Apr 1938 | Box 112 \ 1 scan0078 | |
| Testing a threaded pin to replace the silent-bloc bush at the front anchorage of the rear spring. | 8th Apr 1938 | Box 112 \ 1 scan0079 | |
| Letter arranging a covering order for a pair of 1050 lbs springs. | 11th Apr 1938 | Box 112 \ 1 scan0080 | |
| Covering order to Firths for a pair of rear springs. | 12th Apr 1938 | Box 112 \ 1 scan0081 | |
| Letter from Toledo Woodhead Springs Limited proposing a meeting to discuss a spring design. | 12th Apr 1938 | Box 112 \ 1 scan0082 | |
| Letter to Toledo Woodhead Springs Ltd. to arrange a meeting to discuss road springs. | 14th Apr 1938 | Box 112 \ 1 scan0083 | |
| Letter from Toledo Woodhead Springs Limited arranging a meeting to discuss springs. | 20th Apr 1938 | Box 112 \ 1 scan0084 | |
| Recurring bolt failure on the Bentley III & 50 front suspension torque arm and a proposed solution. | 26th Apr 1938 | Box 112 \ 1 scan0085 | |
| Requesting rough details for a temporary rebound strap scheme for the first Bentley 50 chassis. | 14th Apr 1938 | Box 112 \ 1 scan0086 | |
| The production of a temporary rear spring pad for the first Bentley 50 chassis. | 3rd May 1938 | Box 112 \ 1 scan0087 | |
| Requesting an order from Thos. Firth for a pair of Bentley 50 rear springs. | 8th Jun 1938 | Box 112 \ 1 scan0088 | |
| Internal request to prepare a scheme for a B.III suspension stay and instruct sets for testing. | 9th Jun 1938 | Box 112 \ 1 scan0089 | |
| Road spring requirements for the 1-B-50 vehicle, including weight comparisons and spring specifications. | 9th Jun 1938 | Box 112 \ 1 scan0090 | |
| Rear spring specifications for models 1.B.50, B.III, and Silver Wraith. | 9th Jun 1938 | Box 112 \ 1 scan0091 | |
| Weight calculation for a complete car, model 1.B.50, broken down by chassis, accessories, and coachwork. | 9th Jun 1938 | Box 112 \ 1 scan0092 | |
| Calculation of front and rear wheel loads for a Wraith III Continental Touring Limousine. | 13th Jun 1938 | Box 112 \ 1 scan0093 | |
| Requesting analysis of front spring deflection and stress for models B.III and B.50. | 13th Jun 1938 | Box 112 \ 1 scan0094 | |
| List of alterations to the specification for the B.III and B.50 chassis suspension. | 14th Jun 1938 | Box 112 \ 1 scan0095 | |
| Request to replace the front springs on chassis 1.B.50 with a later type. | 22th Jun 1938 | Box 112 \ 1 scan0096 | |
| Request to manufacture two packing pieces for the front suspension of vehicle 1.B.50. | 24th Jun 1938 | Box 112 \ 1 scan0097 | |
| New drawings for the front wheel spring suspension mechanism on the Bentley 50 chassis. | 27th Jun 1938 | Box 112 \ 1 scan0098 | |
| Requesting an urgent order for two Bentley 50 front springs from the English Steel Corp, with a special request for Cyanide Heat Treatment. | 4th Jul 1938 | Box 112 \ 1 scan0099 | |
| Spring ratings of a chassis and a change to the front springs. | 25th Jul 1938 | Box 112 \ 1 scan0100 | |
| Deciding on 7' static deflection rear springs for B.50 & Wraith Co. models and requesting new drawings. | 17th Aug 1938 | Box 112 \ 1 scan0101 | |
| Modifications to the front suspension and rear track for the B.50 model, including clearance issues. | 20th Aug 1938 | Box 112 \ 1 scan0102 | |
| Sending a pair of Bentley 50 coil springs for heat treatment and finishing. | 23th Aug 1938 | Box 112 \ 1 scan0103 | |
| The yoke piece (FD.251) for the Bentley 50 to achieve an increased front track of 58.500 inches. | 30th Aug 1938 | Box 112 \ 1 scan0104 | |
| Rear leaf spring adjustments to accommodate new front coil springs. | 6th Sep 1938 | Box 112 \ 1 scan0105 | |
| Instructions for modifying the B.III, B.50, and W.80 front yokes to increase damper clearances for production. | 15th Nov 1938 | Box 112 \ 1 scan0106 | |
| The investigation of vertical body shake, detailing tests on a vibrator rig and the effectiveness of fitting stiffening plates. | 8th Dec 1938 | Box 112 \ 1 scan0107 | |
| Stiffness of a new frame design compared to an old one and the effects of welding. | 8th Dec 1938 | Box 112 \ 1 scan0108 | |
| Blueprint for strengthening plates, showing dimensions and placement. | 5th Dec 1938 | Box 112 \ 1 scan0109 | |
| Graph showing records of vertical movement on a vibrator at 725 RPM. | 1st Dec 1938 | Box 112 \ 1 scan0110 | |
| Table of torsional stiffness and vertical deflection measurements for different chassis setups. | 1st Dec 1938 | Box 112 \ 1 scan0111 | |
| Graph plotting chassis deflection against distance from the front end for different configurations, under a 500 lbs load on each side of the front seat. | 1st Dec 1938 | Box 112 \ 1 scan0112 | |
| Calculations for the deflection of a freely supported beam with two different sections, loaded in the middle. | 10th Jan 1939 | Box 112 \ 1 scan0113 | |
| The order of springs from the English Steel Corporation for a Bentley 50 chassis. | 10th Jan 1939 | Box 112 \ 1 scan0114 | |
| Instruction to change the front road springs on chassis 2.B.50 due to having too high a rate. | 23th Feb 1939 | Box 112 \ 1 scan0115 | |
| Results of changing the front road springs on car 2.B.50. | 2nd Mar 1939 | Box 112 \ 1 scan0116 | |
| Revised specifications for B.50 front suspension springs. | 13th Mar 1939 | Box 112 \ 1 scan0117 | |
| Comparison of specifications for 850 lb. and 900 lb. springs for the B.50 model, with revised normal positions. | 15th Mar 1939 | Box 112 \ 1 scan0118 | |
| Request to place an official order for two pairs of front coil springs from English Steel Corporation, Sheffield. | 15th Mar 1939 | Box 112 \ 1 scan0119 | |
| Letter from Clayton Dewandre Co. Ltd. proposing a meeting to discuss adding a Dewandre double piston Servo to Girling Brakes. | 8th Jun 1937 | Box 112 \ 1 scan0120 | |
| Letter to Messrs. Clayton Dewandre Company Limited confirming a meeting. | 9th Jun 1937 | Box 112 \ 1 scan0121 | |
| Letter from Clayton Dewandre Co. Ltd. about a completed scheme for 'Dewandre' Vacuum Servo Equipment. | 10th Jul 1937 | Box 112 \ 1 scan0122 | |
| Letter to Clayton Dewandre Co. to arrange a meeting to discuss Dewandre Vacuum Servo Equipment. | 13th Jul 1937 | Box 112 \ 1 scan0123 | |
| Letter from Clayton Dewandre Co. Ltd. confirming Mr. Edge will attend the works the following day. | 15th Jul 1937 | Box 112 \ 1 scan0124 | |
| Letter to Clayton Dewandre Ltd. confirming arrangements for a Dewandre Vacuum Servo, requesting a wooden model and pricing. | 16th Jul 1937 | Box 112 \ 1 scan0125 | |
| Letter from Clayton Dewandre Company Ltd. confirming arrangements for a sample to be fitted to a chassis. | 19th Jul 1937 | Box 112 \ 1 scan0126 | |
| Letter from Clayton Dewandre Co. Ltd. discussing a proposed brake layout, servo unit positioning, and alternative linkage options. | 27th Jul 1937 | Box 112 \ 1 scan0127 | |
| Letter to Clayton Dewandre Co. Ltd. acknowledging receipt of a wooden model for a vacuum servo. | 28th Jul 1937 | Box 112 \ 1 scan0128 | |
| Letter to Clayton Dewandre Co. Ltd. concerning a delay in the design of a vacuum servo for a Bentley's brakes. | 8th Sep 1937 | Box 112 \ 1 scan0129 | |
| Requesting the manufacture of a prototype spring for a new Bentley 50 servo design. | 22th Mar 1938 | Box 112 \ 1 scan0130 | |
| Urgent request for modified Bentley 50 servo springs and a plan for existing ones. | 9th Apr 1938 | Box 112 \ 1 scan0131 | |
| Reduction in length of cam levers for the Bentley 111 and 50 Servo to clear the frame. | 13th Apr 1938 | Box 112 \ 1 scan0132 | |
| Concerns about the new Bentley 50 servo motor and a request for a test setup. | 26th Apr 1938 | Box 112 \ 1 scan0133 | |
| The B.50 servo mechanism after a 107-hour endurance rig test. | 8th Jul 1938 | Box 112 \ 1 scan0134 | |
| Requesting alternative servo opening springs for testing due to issues with the current ones. | 22th Jul 1938 | Box 112 \ 1 scan0135 | |
| Suggestion regarding the arrangement of balls in the Bentley III and E.50 Servo to prevent shaft grooving. | 29th Sep 1938 | Box 112 \ 1 scan0136 | |
| Requesting the fitting of four graphite cylinders to a servo lining. | 29th Sep 1938 | Box 112 \ 1 scan0137 | |
| Modification to the B.50 and B.V. servo shaft for easier oil seal removal and manufacture. | 28th Nov 1938 | Box 112 \ 1 scan0138 | |
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