| Description | Date | Identifier | |
| Reporting a B.V. propeller shaft centre bearing failure and proposing testing of new bearings. | 11th May 1939 | Box 99 \ 4 scan0114 | |
| Design change to a propeller shaft centre bearing. | 6th Jun 1939 | Box 99 \ 4 scan0115 | |
| Elimination of B.V. propellor shaft vibration by adjusting the rear axle. | 26th Jun 1939 | Box 99 \ 4 scan0116 | |
| Delayed release of a propeller shaft (10BV) due to ongoing tests. | 21th Jul 1939 | Box 99 \ 4 scan0117 | |
| Instruction regarding the Propeller Shaft Centre Bearing for the Bentley V 'A' Series. | 15th Aug 1939 | Box 99 \ 4 scan0118 | |
| On the necessity and technical details of an improved universal joint for the Bentley V chassis. | 23th Aug 1939 | Box 99 \ 4 scan0119 | |
| Correcting 'propellor shaft periods' when a vehicle is loaded with four people. | 14th Mar 1940 | Box 99 \ 4 scan0120 | |
| Requesting a design and details for a raised crown piston to be compared against an Aerolite version. | 17th Aug 1938 | Box 99 \ 4 scan0121 | |
| Request to fit an experimental set of pistons to a B.III No.1 Unit. | 22th Nov 1938 | Box 99 \ 4 scan0122 | |
| Revisions to the Bentley 111 High Compression Split Piston design. | 8th Dec 1938 | Box 99 \ 4 scan0123 | |
| Reduction in piston dimensions for the Wraith engine to safeguard against big end failure. | 2nd Dec 1938 | Box 99 \ 4 scan0124 | |
| Compression ratio for the B.V. model, detailing the use of raised crown pistons and comparing performance. | 9th Feb 1939 | Box 99 \ 4 scan0125 | |
| Bentley V piston road tests with an increased compression ratio to improve engine performance. | 9th Feb 1939 | Box 99 \ 4 scan0126 | |
| Graph of the governor advance curve for a Delco-Remy distributor on 7:1 compression pistons. | 2nd Dec 1938 | Box 99 \ 4 scan0127 | |
| Specification for a D.CD.1373 Distributor with a vernier adjustment unit adapted for a B.V. engine. | 19th May 1939 | Box 99 \ 4 scan0128 | |
| Development of a governor curve to suit 7-1-raised crown pistons for 8 B.V and 7 B.V engines. | 1st Jun 1939 | Box 99 \ 4 scan0129 | |
| Engine detonation tests and ordering pistons with a 6 1/2:1 compression ratio. | 12th Jun 1939 | Box 99 \ 4 scan0130 | |
| Standardization and specifications for Bentley V production pistons. | 13th Jun 1939 | Box 99 \ 4 scan0131 | |
| Four possible positions for the gear lever on the Bentley III to improve driver access. | 7th Jan 1937 | Box 99 \ 4 scan0132 | |
| Secret internal memo discussing the gearbox and gear lever position for the B.III model. | 12th Jan 1937 | Box 99 \ 4 scan0133 | |
| The design of a fully isolated gear lever for the Bentley 111 universal box. | 9th Oct 1937 | Box 99 \ 4 scan0134 | |
| List of modifications for the G.CD.161 Overdrive Gearbox on a Bentley 11A chassis. | 1st Nov 1937 | Box 99 \ 4 scan0135 | |
| Modification to the Bentley 111 change gear mechanism, introducing a new bracket for a lowered frame. | 29th Nov 1937 | Box 99 \ 4 scan0136 | |
| Servo and speedometer drives for the Bentley 111 Universal Gear Box. | 4th Dec 1937 | Box 99 \ 4 scan0137 | |
| Gearbox for the Bentley 111, detailing adaptations for speedometer gears and a hand control for rear dampers. | 8th Dec 1937 | Box 99 \ 4 scan0138 | |
| Temporary scheme for the change gear lever mechanism on a Bentley 111 chassis, using parts from a Wraith. | 13th Dec 1937 | Box 99 \ 4 scan0139 | |
| Technical memo about the blueprints for a stay at the rear end of the gearbox for a Bentley 111. | 31th Dec 1937 | Box 99 \ 4 scan0140 | |
| Design, manufacturing, and cost considerations for a new gearbox for the Bentley 111. | 5th Jan 1938 | Box 99 \ 4 scan0141 | |
| Instructions on material changes for bushes and thrust washers in the Bentley 111 universal gearbox. | 22th Jan 1938 | Box 99 \ 4 scan0142 | |
| The Bentley 111 gearbox actuating mechanism, drawing PD.103. | 31th Jan 1938 | Box 99 \ 4 scan0143 | |
| The servo drive, damper control pump, and speedometer drive for the Bentley 111 gearbox. | 25th Feb 1938 | Box 99 \ 4 scan0144 | |
| On modifications to the servo balancer suspension link and rear brake linkage for the Bentley 111 gearbox and servo. | 7th Apr 1938 | Box 99 \ 4 scan0145 | |
| Refusing a suggestion to make a gearbox casting in iron due to the resulting weight increase. | 16th May 1938 | Box 99 \ 4 scan0146 | |
| Stuck second gear and other modifications for a 7.B.V. Bebtley III. | 16th May 1938 | Box 99 \ 4 scan0147 | |
| File index card referencing memos for an 8.B.V. gearbox French test and a B.50 gearbox. | 9th Aug 1938 | Box 99 \ 4 scan0148 | |
| Urgent internal memo requesting complete details for the production of Bentley III gearboxes. | 8th Aug 1938 | Box 99 \ 4 scan0149 | |
| List of modifications required for Gearbox B.III No.1 before fitting it into an 8.B.V. | 11th Aug 1938 | Box 99 \ 4 scan0150 | |
| Test report on a Bentley III differential gearbox, detailing the effect of temperature on backlash and pre-load. | 13th Sep 1938 | Box 99 \ 4 scan0151 | |
| Instructions for modifications to a B.50 Gearbox B.) No.2. | 3rd Oct 1938 | Box 99 \ 4 scan0152 | |
| Replacement parts for the Bentley 111, 1st and 3rd motion shaft. | 14th Oct 1938 | Box 99 \ 4 scan0153 | |
| Proposing a policy of testing gears with known errors for the Bentley 111 gear box. | 4th Nov 1938 | Box 99 \ 4 scan0154 | |
| Development, costs, and implementation of a new gearbox for the Bentley 111. | 4th Nov 1938 | Box 99 \ 4 scan0155 | |
| Letter to George Angus & Co. Ltd. regarding the unsatisfactory performance of 'Gaco' seals during an endurance test. | 14th Nov 1938 | Box 99 \ 4 scan0156 | |
| Instructions for fitting a temporary spring for the Synchro-Mesh on the Bentley V Chassis, detailing part replacements. | 18th Nov 1938 | Box 99 \ 4 scan0157 | |
| Letter to Geo. Salter & Co. Ltd. urgently requesting springs for experimental purposes. | 18th Nov 1938 | Box 99 \ 4 scan0158 | |
| Official order be sent to Geo. Salter & Co. for 4 springs. | 18th Nov 1938 | Box 99 \ 4 scan0159 | |
| Letter from Geo. Salter & Co. Ltd. confirming instructions and a dispatch date for the manufacture of springs. | 21th Nov 1938 | Box 99 \ 4 scan0160 | |
| Letter from Angus Oil Seals concerning the failure of 'Gaco' Seals during a long-distance endurance test. | 21th Nov 1938 | Box 99 \ 4 scan0161 | |
| Letter from George Angus & Co Ltd concerning the failure of 'Gaco' Seals during a long-distance endurance car test. | 24th Nov 1938 | Box 99 \ 4 scan0162 | |
| Continuation of a letter from George Angus & Co. Ltd., Oil Seal Department, discussing product performance tests. | 30th Nov 1938 | Box 99 \ 4 scan0163 | |
| Requesting a covering order for oil seals to be sent to Messrs. George Angus Ltd. | 30th Nov 1938 | Box 99 \ 4 scan0164 | |
| Modifications to the Wraith gear box for use in the Bentley 111. | 15th Dec 1938 | Box 99 \ 4 scan0165 | |
| Installation of a Wraith Gear Box into a Bentley V frame. | 22th Dec 1938 | Box 99 \ 4 scan0166 | |
| New rear cover (G.CD.1092) for fitting a Wraith gearbox into a Bentley V frame. | 22th Dec 1938 | Box 99 \ 4 scan0167 | |
| Temporary scheme for a spring-loaded synchromesh gearbox, possibly for a Bentley V model. | 30th Dec 1938 | Box 99 \ 4 scan0168 | |
| Noise issues with the Bentley V gearbox for B.V. cars and proposing solutions. | 2nd Jan 1939 | Box 99 \ 4 scan0169 | |
| Trial of a modified 2nd motion shaft and 1st speed pinion to improve gearbox silence. | 9th Jan 1939 | Box 99 \ 4 scan0170 | |
| 1/4 scale layout showing alterations for installing a Wraith Gearbox in a 4.B.V. Chassis. | 9th Jan 1939 | Box 99 \ 4 scan0171 | |
| Experiment to provide tip relief on a gear wheel for the Bentley V gearbox by grinding. | 9th Jan 1939 | Box 99 \ 4 scan0172 | |
| Notification regarding a modification to ball bearings on gearbox operating forks. | 10th Jan 1939 | Box 99 \ 4 scan0173 | |
| The forces in pounds required to operate the Wraith reverse gear. | 12th Jan 1939 | Box 99 \ 4 scan0174 | |
| Cost estimate for a Cross-Shaft and Levers for a Wraith Gearbox in a B.V. Chassis. | 19th Jan 1939 | Box 99 \ 4 scan0175 | |
| Adaptation of a Wraith change gear mechanism to a Bentley B.5 chassis. | 23th Jan 1939 | Box 99 \ 4 scan0176 | |
| Scheme for a shortened change gear lever for a Wraith lll mechanism in a B.5 chassis. | 23th Jan 1939 | Box 99 \ 4 scan0177 | |
| Secret report on the development and noise issues of the gearbox for the rationalised programme. | 23th Jan 1938 | Box 99 \ 4 scan0178 | |
| Technical analysis of a gearbox design, detailing issues with noise, cost, and implementation compared to the production Wraith gearbox. | 23th Jan 1939 | Box 99 \ 4 scan0179 | |
| Summary of recommendations regarding the design, cost, and production schedule for new gearboxes, comparing them to the Wraith box. | 23th Jan 1939 | Box 99 \ 4 scan0180 | |
| Comparison table of gearbox weights and costs for various car models including Humber, Hillman, Rover, Wraith, and Bentley. | 23th Jan 1939 | Box 99 \ 4 scan0181 | |
| Blueprint diagram illustrating brake gear complications with the Wraith gearbox. | 24th Jan 1939 | Box 99 \ 4 scan0182 | |
| Confirming readiness to proceed with a postponed experiment on a 30-EX Dyno Chassis. | 24th Jan 1939 | Box 99 \ 4 scan0183 | |
| List of sections affected by the fitting of a Wraith type gearbox to a Bentley 5 chassis. | 26th Jan 1939 | Box 99 \ 4 scan0184 | |
| Visits to suppliers to assess their capability of manufacturing a helical reverse gear for the B.V. gearbox. | 4th Feb 1939 | Box 99 \ 4 scan0185 | |
| Modifications to B.V. gearboxes, removing overdrive for Bentley 50's and correcting helical gear diameters. | 7th Feb 1939 | Box 99 \ 4 scan0186 | |
| Notification regarding a modified engine front support arch for fitting a Wraith gearbox into a Bentley chassis. | 17th Feb 1939 | Box 99 \ 4 scan0187 | |
| Scheme for a spring-loaded synchromesh in the B.V. Gear Box, and modifications to the gear trains. | 17th Feb 1939 | Box 99 \ 4 scan0188 | |
| Drawing PD.366 for the B.V. Gearbox, detailing a stiffened rod, an increased capacity ball bearing, and a potential bronze pad feature. | 17th Feb 1939 | Box 99 \ 4 scan0189 | |
| Production hold on parts for the Bentley V Chassis, pending a decision between straight and helical gears. | 23th Feb 1939 | Box 99 \ 4 scan0190 | |
| The production and trial of specific gear parts for a Bentley V Chassis. | 18th Feb 1939 | Box 99 \ 4 scan0191 | |
| Gearbox noise issues in the B.V. car, comparing the B.50 box with a Wraith overdrive box. | 23th Feb 1939 | Box 99 \ 4 scan0192 | |
| Modification of the engine front support arch for fitting a Wraith gearbox into a Bentley chassis. | 28th Feb 1939 | Box 99 \ 4 scan0193 | |
| Proposal for an alternative method of lubricating the speedometer drive bearing. | 4th Mar 1939 | Box 99 \ 4 scan0194 | |
| Redesigning the Bentley 5 gearbox to use helical gears for quieter operation. | 6th Mar 1939 | Box 99 \ 4 scan0195 | |
| Requesting the rebuilding of B.V. gearboxes to address the lack of a reverse gear. | 8th Mar 1939 | Box 99 \ 4 scan0196 | |
| Modifications to the Bentley V gearbox casing. | 11th Mar 1939 | Box 99 \ 4 scan0197 | |
| Prints for a B.V. gearbox and the need to acquire tooling to manufacture the parts. | 24th Mar 1939 | Box 99 \ 4 scan0198 | |
| Recommending a modification to cure oil leaks from the B.V. gearbox. | 25th Mar 1939 | Box 99 \ 4 scan0199 | |
| Proposal for fitting a Reverse Light Switch and gear shaft cover to the Bentley V change gear lever and gate. | 29th Mar 1939 | Box 99 \ 4 scan0200 | |
| Instruction memo for the production of 6 Overdrive Gearboxes and material specification for selector forks. | 19th Apr 1939 | Box 99 \ 4 scan0201 | |
| Confirmation memo regarding the replacement of needles with bushes in a B.V. Gearbox reverse shaft. | 25th Apr 1939 | Box 99 \ 4 scan0202 | |
| Proposal to eliminate gearbox oil leaks by replacing a felt seal with a screwed plug. | 27th Apr 1939 | Box 99 \ 4 scan0203 | |
| Specifications for the Bentley 5 gearbox, covering reverse shaft clearance and a modified reverse selector spring. | 29th Apr 1939 | Box 99 \ 4 scan0204 | |
| The loss of damper poundage in the Bentley V gearbox, attributing it to carbon chips and requesting a new gauze filter. | 5th May 1939 | Box 99 \ 4 scan0205 | |
| Design and implementation of a combined dipstick and filler plug for a B.5 gearbox. | 9th May 1939 | Box 99 \ 4 scan0206 | |
| Continued note discussing the replacement of a tube with a rod and Bakelite knob. | 9th May 1939 | Box 99 \ 4 scan0207 | |
| Changes to a gearbox bearing order and related drawing specifications. | 16th May 1939 | Box 99 \ 4 scan0208 | |
| Replacement of Hoffmann bearings with 'Duplex' bearings on the 1st & 3rd motion shafts for the Bentley V. Chassis. | 18th May 1939 | Box 99 \ 4 scan0209 | |
| Confirming modifications to the B.V. Gearbox before production release of 300 sets. | 2nd May 1939 | Box 99 \ 4 scan0210 | |
| Modifications to gearbox parts for the Bentley 5 experimental and production chassis. | 23th May 1939 | Box 99 \ 4 scan0211 | |
| Confirming an agreement on parts for B.V. gearboxes and ordering more for new car models. | 27th May 1939 | Box 99 \ 4 scan0212 | |
| Revised specification for 12 experimental production gearboxes for the Bentley V chassis. | 31th May 1939 | Box 99 \ 4 scan0213 | |
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