| Description | Date | Identifier | |
| Graph showing the results of gearbox control tests on a 20/25 HP oil pump. | 3rd Apr 1933 | Box 104 \ 4 scan0190 | |
| Gearbox control, discussing the results of an engine oil pump test and its unsuitability. | 1st Apr 1933 | Box 104 \ 4 scan0191 | |
| Modifications to the change gear lever mechanism. | 13th Apr 1933 | Box 104 \ 4 scan0192 | |
| Curve of figures required for a gearbox control system. | 20th Apr 1933 | Box 104 \ 4 scan0193 | |
| Test results for a 20/25 oil pump's radial and end clearances at different speeds, pressures, and temperatures. | 19th Apr 1933 | Box 104 \ 4 scan0194 | |
| Record of gearbox control tests showing the rate of temperature rise at a specific pump speed and pressure. | 19th Apr 1933 | Box 104 \ 4 scan0195 | |
| Series of gearbox control tests plotting pump delivery rate against pump speed at various pressures and temperatures. | 19th Apr 1933 | Box 104 \ 4 scan0196 | |
| Performance of a synchromesh 2nd gear mechanism when tested while submerged in oil. | 12th Jun 1933 | Box 104 \ 4 scan0197 | |
| With questions regarding roller bearings with grooves for the new J.3. gearbox. | 13th Jun 1933 | Box 104 \ 4 scan0198 | |
| Standardisation of a helical second speed gear for the 20/25 HP chassis. | 3rd Feb 1933 | Box 104 \ 4 scan0199 | |
| Standardization report for chassis parts, detailing the first chassis fitment and associated costs. | 10th Jun 1933 | Box 104 \ 4 scan0200 | |
| Gearbox for 'Japan 3', comparing ratios and design changes with existing models. | 4th Sep 1933 | Box 104 \ 4 scan0201 | |
| Technical memorandum detailing modifications to a gearbox design, including pinions, clutches, and servo placement. | 4th Sep 1933 | Box 104 \ 4 scan0202 | |
| The design and suspension of the 'Japan 3' gearbox. | 8th Sep 1933 | Box 104 \ 4 scan0203 | |
| Sheet metal crossmember for the rear end of a box, similar to that on the 20/25 model. | 8th Sep 1933 | Box 104 \ 4 scan0204 | |
| Schemes 3824/5/6 for gearbox modifications to improve lubrication of the servo. | 18th Sep 1933 | Box 104 \ 4 scan0205 | |
| Requesting modification of an actuating piece for the J.3. Gearbox. | 1st Nov 1933 | Box 104 \ 4 scan0206 | |
| The pedal arrangement for a J.3 engine with a separate gearbox, referencing scheme 3833. | 6th Nov 1933 | Box 104 \ 4 scan0207 | |
| Modifications needed to adapt a gearbox for the Vulture and J.3 projects. | 10th Nov 1933 | Box 104 \ 4 scan0208 | |
| Forwarding the scheme for a jointed coupling between the engine and gearbox for the J.3 project. | 18th Nov 1933 | Box 104 \ 4 scan0209 | |
| Requesting the creation of a modified gear gate to eliminate gear lever rattles on a 20/25 model. | 20th Nov 1933 | Box 104 \ 4 scan0210 | |
| Bracket for the J.3 model with a separate gearbox. | 1st Dec 1933 | Box 104 \ 4 scan0211 | |
| N. Sch's 3835/6 layouts of a gearbox in a chassis with an existing engine. | 4th Dec 1933 | Box 104 \ 4 scan0212 | |
| Brake system modifications for the J.3 model with a separate gearbox. | 7th Dec 1933 | Box 104 \ 4 scan0213 | |
| The pedal arrangement for the J.3 engine with a separate gearbox. | 9th Dec 1933 | Box 104 \ 4 scan0214 | |
| Standardisation of parts for an anti-rattle change speed gear lever. | 2nd Nov 1933 | Box 104 \ 4 scan0215 | |
| Proposed adjustments for the Top, 3rd, and 2nd speed S.M. Cones in the J.3. Gearbox. | 27th Dec 1933 | Box 104 \ 4 scan0216 | |
| Reduction of 2nd speed leverage in the J.3. gearbox. | 29th Dec 1933 | Box 104 \ 4 scan0217 | |
| Instructions for a modification to the 2nd speed dogs for Bentley, 20/25, and Phantom models. | 2nd Jan 1934 | Box 104 \ 4 scan0218 | |
| Experimental changes to the J.3 Gearbox synchro-mesh components. | 26th Jan 1934 | Box 104 \ 4 scan0219 | |
| Introduction and progress of a second speed synchromesh gearbox. | 29th Jan 1934 | Box 104 \ 4 scan0220 | |
| Modification to the clutch and gearbox pedal control. | 23th Jan 1934 | Box 104 \ 4 scan0221 | |
| The weights of Vulture, 40/50 HP, and 20/25 HP gearboxes and related components. | 30th Jan 1934 | Box 104 \ 4 scan0222 | |
| Replying to an inquiry about the expected delivery of an E.N.V. gearbox for a 25 HP car. | 23th Feb 1934 | Box 104 \ 4 scan0223 | |
| Query asking for a date when the E.N.V. Gear Box is likely to be running. | 19th Feb 1934 | Box 104 \ 4 scan0224 | |
| Experiments on synchro mesh clutch cones to prevent sticking by adding a screw thread and testing alternative materials. | 26th Feb 1934 | Box 104 \ 4 scan0225 | |
| Alterations to the J.3. Gearbox selector shaft and 1st speed pinion for use with the 20/25 engine. | 28th Mar 1934 | Box 104 \ 4 scan0226 | |
| Second speed synchromesh for the 20/25 model, covering production schedules and alternative gearbox options. | 24th Apr 1934 | Box 104 \ 4 scan0227 | |
| Reminder to locate a redundant Synchro Mesh Gear Box for A.V.M. Longmore's 25 HP car, with a handwritten follow-up query. | 4th May 1934 | Box 104 \ 4 scan0228 | |
| Fitting a Synchro Mesh cast iron gearbox to Longmore's 25 HP car, model GTR-3. | 11th May 1934 | Box 104 \ 4 scan0229 | |
| Standardisation of parts for Alternate Second Speed Gear Dogs, backed off. | 27th Apr 1934 | Box 104 \ 4 scan0230 | |
| Estimated cost for extra jigs, tools, and equipment for the 'F2' series chassis production. | 29th May 1934 | Box 104 \ 4 scan0231 | |
| Standardisation of a pressed steel change gear gate. | 27th Apr 1934 | Box 104 \ 4 scan0232 | |
| Cost estimate and production note for jigs, tools, and equipment for the 'F2' series chassis. | 29th May 1934 | Box 104 \ 4 scan0233 | |
| Causes of and potential solutions for gear lever rattles. | 23th Jul 1934 | Box 104 \ 4 scan0234 | |
| Patent application for a scheme to prevent gearbox synchromesh rattles. | 25th Jul 1934 | Box 104 \ 4 scan0235 | |
| Locating plunger to prevent synchromesh parts rattling in gearbox. | 6th Sep 1934 | Box 104 \ 4 scan0236 | |
| Note regarding tool costs and production feasibility for the 'F.2' series chassis. | 3rd Sep 1934 | Box 104 \ 4 scan0237 | |
| Confirming the elimination of an oil leak from the speedometer drive on a 20/25HP model following a modification. | 15th Oct 1934 | Box 104 \ 4 scan0238 | |
| Merits of central change versus side change for gear and brake levers. | 15th Nov 1934 | Box 104 \ 4 scan0239 | |
| Disadvantages of side change gear levers on driver comfort. | 15th Nov 1934 | Box 104 \ 4 scan0240 | |
| Causes of 'chunking' in gearboxes and comparing them with American design principles. | 14th Mar 1935 | Box 104 \ 4 scan0241 | |
| Instruction to replace a car's Wilson gearbox and update the engine mountings and pedals. | 2nd Apr 1935 | Box 104 \ 4 scan0242 | |
| Modifications for an isolated gear lever for 20/25 models, specifically for Bentley metal floorboards. | 4th May 1935 | Box 104 \ 4 scan0243 | |
| Sending a finished design drawing for the 20/25 HP floorboards and isolated gear change mechanism. | 27th May 1935 | Box 104 \ 4 scan0244 | |
| Chronological log of design modifications and key dates for the 'Change Speed Mechanism'. | 4th Jul 1935 | Box 104 \ 4 scan0245 | |
| Modifications to the 20/25 gearbox and floor boards to accommodate sliding seats. | 15th Jul 1935 | Box 104 \ 4 scan0246 | |
| Requesting a modification to the cover over the pendulum lever on the gearbox. | 15th Jul 1935 | Box 104 \ 4 scan0247 | |
| Slight modifications to the 20/25 gearbox casting and floorboards for the isolated change speed gear mechanism. | 18th Jul 1935 | Box 104 \ 4 scan0248 | |
| Gear lever rattles on Bentley and 20/25 HP cars and the applicability of a standardised scheme. | 18th Jul 1935 | Box 104 \ 4 scan0249 | |
| Inquiring about modifications to the 20/25 HP gearbox to increase the bottom gear ratio. | 12th Sep 1935 | Box 104 \ 4 scan0250 | |
| Standardising the 25 HP Isolated Change Gear Lever using part N.Sch.4612. | 17th Sep 1935 | Box 104 \ 4 scan0251 | |
| Querying the cost increase for an 'Isolated Change Gear Mechanism for 20/25' following a standardisation sheet. | 1st Oct 1935 | Box 104 \ 4 scan0252 | |
| Epidemic of complaints about second gear jumping out on 20/25 HP and Bentley chassis. | 8th Oct 1935 | Box 104 \ 4 scan0253 | |
| 20/25 HP gearbox synchromesh complaint and proposed modification. | 21th Oct 1935 | Box 104 \ 4 scan0254 | |
| Complaints of second gear jumping out on various chassis models. | 24th Oct 1935 | Box 104 \ 4 scan0255 | |
| Interim report regarding complaints of second gear jumping out on 20/25 and Bentley chassis. | 24th Oct 1935 | Box 104 \ 4 scan0256 | |
| Suggestions for modifying the 2nd speed coupling for 20/25 and Bentley models to prevent it from working out of mesh. | 30th Oct 1935 | Box 104 \ 4 scan0257 | |
| Complaints of the second gear jumping out of mesh on 20/25 HP and Bentley models. | 31th Oct 1935 | Box 104 \ 4 scan0258 | |
| Standardisation of parts for an isolated change gear mechanism. | 2nd Oct 1935 | Box 104 \ 4 scan0259 | |
| Cost estimate for extra equipment and a comparison of costs between an old and new part. | 2nd Oct 1935 | Box 104 \ 4 scan0260 | |
| Proposed design modification to fix an issue with the second gear sliding out. | 8th Nov 1935 | Box 104 \ 4 scan0261 | |
| Oil seal modification for the brake countershaft on 20/25 and Bentley gearboxes. | 22th Nov 1935 | Box 104 \ 4 scan0262 | |
| Modifications for the 20/25 and Bentley Gearbox regarding perfect oil seals and cost reduction measures. | 19th Dec 1935 | Box 104 \ 4 scan0263 | |
| Request to manufacture two sheet metal intake bends for a 25/30 HP model, as per drawing Rm.65/6. | 3rd Feb 1936 | Box 104 \ 4 scan0264 | |
| Modification to the Gear Change Gate for the 25-30 model, reducing the gap to the housing. | 24th Feb 1936 | Box 104 \ 4 scan0265 | |
| Modification to the Gear Change Gate for the 25-30 HP model to reduce the gap with its housing. | 24th Feb 1936 | Box 104 \ 4 scan0266 | |
| Experimental three-speed gearbox ratios for the 25-30 model, comparing performance with other vehicles. | 18th Mar 1936 | Box 104 \ 4 scan0267 | |
| Comparative performance data table for various motor cars, including competitor models. | 18th Mar 1936 | Box 104 \ 4 scan0268 | |
| Proposal and analysis of experimental gearbox ratios for the 25-30 model, comparing performance with other models. | 18th Mar 1936 | Box 104 \ 4 scan0269 | |
| Comparative data table of various cars, detailing specifications like weight, capacity, gear ratios, and climbable gradients. | 30th Mar 1936 | Box 104 \ 4 scan0270 | |
| Complaints of the second gear jumping out on Phantom II, Bentley, and 20/25 HP cars. | 30th Mar 1936 | Box 104 \ 4 scan0271 | |
| Issue with the 25 HP isolated change gear lever and proposing a solution. | 10th Jul 1936 | Box 104 \ 4 scan0272 | |
| Comparison of gear ratios and related specifications for a Chevrolet and a 25/30 HP model. | 13th Nov 1936 | Box 104 \ 4 scan0273 | |
| Standardisation of screw threaded synchromesh cones for the 25/30 HP model. | 4th Feb 1937 | Box 104 \ 4 scan0274 | |
| Note on bringing a process into production for the 'P2' Series chassis with no extra tool cost. | 13th Mar 1937 | Box 104 \ 4 scan0275 | |
| Cost-reduction scheme for the 25/30 gearbox synchromesh mechanism. | 13th Mar 1937 | Box 104 \ 4 scan0276 | |
| Blueprint for experimental piston ring type springs to replace plungers in a synchro-mesh system. | 11th Mar 1937 | Box 104 \ 4 scan0277 | |
| Experimental piston ring type spring rings for synchromesh, detailing print distribution and manufacturing instructions. | 16th Mar 1937 | Box 104 \ 4 scan0278 | |
| Experimental piston ring type spring rings for synchromesh, detailing manufacturing changes to ensure correct grain flow. | 16th Mar 1937 | Box 104 \ 4 scan0279 | |
| Instructions regarding the level stick, filling plug, and floorboard modification for the 25/30 HP Gearbox. | 19th Apr 1937 | Box 104 \ 4 scan0280 | |
| Requesting modifications to a 3-speed gearbox from a Citroen Bentley. | 8th Sep 1937 | Box 104 \ 4 scan0281 | |
| Requesting the transfer of a 3 Speed 25/30 Gearbox to the Repair Department. | 4th Oct 1937 | Box 104 \ 4 scan0282 | |
| Request to modify the plunger springs in the synchromesh mechanism for a 3-speed gearbox. | 13th Oct 1937 | Box 104 \ 4 scan0283 | |
| From 'R.' proposing modifications to bonnet shutters, engine, servo, and steering components. | 26th May 1926 | Box 105 \ 1 scan0001 | |
| Request to modify the 20 HP radiator's vertical shutter control mechanism to provide a more linear cooling effect. | 18th Jun 1926 | Box 105 \ 1 scan0002 | |
| Design for a 20 HP radiator with vertical shutters. | 14th Jul 1926 | Box 105 \ 1 scan0003 | |
| Fitting vertical shutters to the 20 HP radiator to improve its appearance. | 2nd Nov 1926 | Box 105 \ 1 scan0004 | |
| Car appearance, focusing on radiators, bonnets, and frame adjustments. | 22th Dec 1926 | Box 105 \ 1 scan0005 | |
| Adaptation of Phantom radiator shutters and carburettor controls for the 20 HP model. | 22th Dec 1926 | Box 105 \ 1 scan0006 | |
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