| Description | Date | Identifier | |
| Letter from Tecalemit regarding a special transmission lubricant for hypoid gears. | 13th May 1930 | Box 136 \ 5 scan0256 | |
| Micro-examination report on a failed Hypoid Gear after a dynamometer test. | 4th Jun 1930 | Box 136 \ 5 scan0257 | |
| List of lubricants that successfully passed a mechanical running test for a hypoid geared axle. | 18th Mar 1930 | Box 136 \ 5 scan0258 | |
| Page 2 of a document detailing generator load and cooling test conditions. | 26th Jun 1930 | Box 136 \ 5 scan0259 | |
| Micro-examination report comparing a failed hypoid gear wheel with two American-manufactured wheels, including hardness tests and material analysis. | 26th Jun 1930 | Box 136 \ 5 scan0260 | |
| Sending a special oil from Prices to replace Whitmores compound for testing. | 10th Sep 1930 | Box 136 \ 5 scan0261 | |
| Submission of a five-gallon drum of special axle oil for testing against a competitor's product. | 3rd Nov 1930 | Box 136 \ 5 scan0262 | |
| Tests on different hypoid rear axle oils, including one from Messrs. Prices' and a new one called Oline. | 3rd Nov 1930 | Box 136 \ 5 scan0263 | |
| Rear axle lubricant named 'Oline' and the reputation of its supplier. | 5th Nov 1930 | Box 136 \ 5 scan0264 | |
| Replacement of a non-standard hypoid gear rear axle on re-conditioned chassis 14-G-IV. | 7th Nov 1930 | Box 136 \ 5 scan0265 | |
| Letter from Oiline Refining Company regarding samples of special gear lubricants for testing. | 10th Nov 1930 | Box 136 \ 5 scan0266 | |
| Current lack of use for a hypoid axle and suggesting its modernization for future use. | 14th Nov 1930 | Box 136 \ 5 scan0267 | |
| Issues with hypoid gears, including correspondence with Gleason Works and details of a double heat treatment process. | 18th Nov 1930 | Box 136 \ 5 scan0268 | |
| Letter from Gleason Works responding to scoring troubles with hypoid gears. | 27th Oct 1930 | Box 136 \ 5 scan0269 | |
| Request for an analysis of Wakefield's Gearease No.1 oil, to be compared with Whitmore's No.0 Hypoid Oil. | 18th Dec 1930 | Box 136 \ 5 scan0270 | |
| Analysis of a sample of Oiline F.J.W. No6 special gear lubricant for hypoid axles. | 27th Jan 1931 | Box 136 \ 5 scan0271 | |
| Secret memo discussing the design and modification of a hypoid rear axle. | 7th Feb 1931 | Box 136 \ 5 scan0272 | |
| Testing and proposed use of Wakefield's Hypoid Axle Compound as an alternative oil for Phantom II rear axles. | 10th Mar 1931 | Box 136 \ 5 scan0273 | |
| Hypoid axle lubrication, detailing issues with Amber Gear Oil and expressing reluctance to change from Whitmore's Compound 'O'. | 12th Mar 1931 | Box 136 \ 5 scan0274 | |
| Suitability and approval process for hypoid axle lubricants. | 13th Mar 1931 | Box 136 \ 5 scan0275 | |
| Specifying the use of Wakefield's oil as an alternative for Hypoid Rear Axles from chassis B-85-M onwards. | 13th Mar 1931 | Box 136 \ 5 scan0276 | |
| Costs and testing of different lubricants for hypoid axles. | 23th Mar 1931 | Box 136 \ 5 scan0277 | |
| The investigation and modification of a noisy 20/25HP Hypoid Axle. | 14th May 1931 | Box 136 \ 5 scan0278 | |
| Inquiry about the probability of standardizing the hypoid type axle for the 25 HP Chassis. | 9th Jun 1931 | Box 136 \ 5 scan0279 | |
| The standardisation of the hypoid axle for the 25 HP model. | 16th Jun 1931 | Box 136 \ 5 scan0280 | |
| Correspondence with Price's Oil Company regarding lubricant options for the Phantom II hypoid axle. | 30th Jun 1931 | Box 136 \ 5 scan0281 | |
| Suitability and approval status of various oils for hypoid rear axle lubrication. | 1st Jul 1931 | Box 136 \ 5 scan0282 | |
| Successful testing of an alternative oil for hypoid rear axles. | 1st Sep 1931 | Box 136 \ 5 scan0283 | |
| Comparing the price of C.C. Wakefield's 'Gearease' against the currently used 'Whitmore Compound' lubricant. | 28th Oct 1931 | Box 136 \ 5 scan0284 | |
| Order for a 5-gallon drum of Wakefields Gearease No.1 for hypoid gear rear axles. | 30th Oct 1931 | Box 136 \ 5 scan0285 | |
| Cost and testing of hypoid axle oils from suppliers Whitmores', Wakefields', and Prices'. | 30th Oct 1931 | Box 136 \ 5 scan0286 | |
| Standardisation of chassis parts concerning an alternative lubricant for hypoid gear rear axles. | 21th Sep 1931 | Box 136 \ 5 scan0287 | |
| From ROY to Hs. updating on the work progress and despatch schedule for Gleason 'Peregrine' Hypoids. | 26th Aug 1932 | Box 136 \ 5 scan0288 | |
| Cover note for a list of approved lubricants for Hypoid Gears submitted by the Gleason Co. | 4th Oct 1932 | Box 136 \ 5 scan0289 | |
| Letter from the Shell Group requesting information on the lubrication of Hypoid gears. | 19th Apr 1933 | Box 136 \ 5 scan0290 | |
| Page 2 of a letter from H. Mitchell to E.V. Hives requesting a meeting. | 19th Apr 1933 | Box 136 \ 5 scan0291 | |
| Letter arranging a meeting to discuss the lubrication of hypoid gears. | 5th May 1933 | Box 136 \ 5 scan0292 | |
| Delays in coordinating gear grinding with an external company and proposing a solution. | 14th Dec 1923 | Box 136 \ 5 scan0293 | |
| Special material claimed to be useful for providing noiseless gears. | 1st May 1924 | Box 136 \ 5 scan0294 | |
| Material 'Celeran' for gears, concluding it offers no advantage over Phosphor Bronze. | 12th May 1924 | Box 136 \ 5 scan0295 | |
| First-speed gear trouble in 4-speed gearboxes of Lanchester, Daimler, and Riley cars. | 20th Mar 1925 | Box 136 \ 5 scan0296 | |
| Comparative analysis of Daimler and Lanchester gearbox designs with annotated diagrams. | 30th Mar 1925 | Box 136 \ 5 scan0297 | |
| Gear and gearbox design, covering issues with unmeshing and comparing various construction methods. | 20th Mar 1925 | Box 136 \ 5 scan0298 | |
| Comparison of ground and cut gears, and an investigation into fitting plain bearings to gearboxes instead of ball or roller types. | 20th Mar 1925 | Box 136 \ 5 scan0299 | |
| Letter from E. Reinbold to E. W. Hives regarding a new patented 'Andrade differential'. | 4th Mar 1926 | Box 136 \ 5 scan0300 | |
| Information on S.A.E. special steel 3440 used in Hudson and Essex gearboxes. | 26th Feb 1934 | Box 136 \ 5 scan0301 | |
| Product for testing, referencing an attached letter and booklet on 'Keenolisation'. | 30th May 1934 | Box 136 \ 5 scan0302 | |
| Investigating a complaint about the quality of 3rd speed helical gears supplied by The Gear Grinding Co. Ltd. | 1st Feb 1937 | Box 136 \ 5 scan0303 | |
| Preliminary report on improving the quietness of 25/30 HP engine timing gears and Phantom gearbox gears. | 3rd Apr 1937 | Box 136 \ 5 scan0304 | |
| List of improvements and standards for gear manufacturing, grinding, and testing. | 3rd Apr 1937 | Box 136 \ 5 scan0305 | |
| Report page discussing the accuracy of broaches and their responsibility for noise. | 3rd Apr 1937 | Box 136 \ 5 scan0306 | |
| Improving the quality and reducing the cost of chassis gear production. | 25th Jun 1937 | Box 136 \ 5 scan0307 | |
| Technical memorandum on achieving silent gearing in timing and gearbox systems. | 31th Aug 1937 | Box 136 \ 5 scan0308 | |
| Gear generating purposes, specifications, and methods for achieving gear quietness. | 31th Aug 1937 | Box 136 \ 5 scan0309 | |
| Gear eccentricity, tip clearance, and helix accuracy for silent gearing in the Phantom III. | 31th Aug 1937 | Box 136 \ 5 scan0310 | |
| Blueprints for the Phantom III Idler Gear and a request for production. | 3rd Sep 1937 | Box 136 \ 5 scan0311 | |
| Blueprints for Phantom III Idler Gear components and a request to produce six sets. | 3rd Sep 1937 | Box 136 \ 5 scan0312 | |
| Necessary primary effects and permissible errors for producing silent gearing. | 3rd Sep 1937 | Box 136 \ 5 scan0313 | |
| Gear tooth design, profile errors, and pressure angles, referencing the Phantom III constant mesh pinion. | 9th Sep 1937 | Box 136 \ 5 scan0314 | |
| Opinion regarding the modification of tooth form for involute transmission gears. | 3rd Sep 1937 | Box 136 \ 5 scan0315 | |
| Responding to a controversy and clarifying previous points on the subject of silent gears. | 22th Sep 1937 | Box 136 \ 5 scan0316 | |
| Reprinted article on the subject of automobile worm gearing. | 1st Sep 1937 | Box 136 \ 5 scan0317 | |
| Comprehensive survey on worm gearing for modern automobile drives. | 1st Sep 1937 | Box 136 \ 5 scan0318 | |
| Analysis of worm gear design, contact mechanics, load capacity, and comparison with bevel gears. | 1st Sep 1937 | Box 136 \ 5 scan0319 | |
| Detailed analysis of worm gearing, covering efficiency, design considerations, materials, and manufacturing processes. | 1st Sep 1937 | Box 136 \ 5 scan0320 | |
| Technical explanation of the design, forces, contact, lubrication, wear, and pitting in worm gear assemblies. | 1st Sep 1937 | Box 136 \ 5 scan0321 | |
| Page discussing the principles, mounting, and standardization of worm gearing. | 14th Oct 1937 | Box 136 \ 5 scan0322 | |
| Letter from gear-maker David Brown to Bentley Motors regarding a leaflet on 'Automobile Worm Gearing' and an invitation to meet at the Motor Exhibitions. | 14th Oct 1937 | Box 136 \ 5 scan0323 | |
| The testing and noise comparison of unground first-speed gears for Bentley models. | 14th Dec 1937 | Box 136 \ 5 scan0324 | |
| Modification to the Wraith gear lever knob to eliminate rattles. | 10th Mar 1938 | Box 136 \ 5 scan0325 | |
| Bentley engine gears, comparing unhardened gears against 45° helix angle gears. | 1st Apr 1938 | Box 136 \ 5 scan0326 | |
| Modification notice for the B.111 and B.50 change gear mechanism as an economy measure. | 26th Apr 1938 | Box 136 \ 5 scan0327 | |
| Suggestion to improve the Bentley 50 and 111 gear change lever by adding a hard rubber bush. | 10th Jun 1938 | Box 136 \ 5 scan0328 | |
| Proposal to modify the change speed gear on the Wraith III to address a knocking complaint. | 11th Jun 1938 | Box 136 \ 5 scan0329 | |
| Findings on change speed mechanisms, including issues with gates, stops, and engine oscillation. | 30th Jun 1938 | Box 136 \ 5 scan0330 | |
| Letter regarding the return of two pairs of loaned axle gears. | 12th Oct 1938 | Box 136 \ 5 scan0331 | |
| Arranging the return of two sets of loaned axle gears. | 13th Oct 1938 | Box 136 \ 5 scan0332 | |
| The return of borrowed parts from Lendrum & Hartman. | 17th Oct 1938 | Box 136 \ 5 scan0333 | |
| Comparative tests on Phantom III idler gears to determine torque and ageing effects. | 10th Jun 1939 | Box 136 \ 5 scan0334 | |
| Paper on ground form finishing hobs and gear manufacturing presented at a Society of Automotive Engineers meeting. | 15th Jan 1940 | Box 136 \ 5 scan0335 | |
| Page discussing the manufacturing of accurate and quiet gears, focusing on hobbing techniques and hob tolerances. | 15th Jan 1940 | Box 136 \ 5 scan0336 | |
| Page discussing the design, calculation, and testing of hobs for generating gear teeth. | 15th Jan 1940 | Box 136 \ 5 scan0337 | |
| The operation and use of hob lead checkers and contour testing fixtures for gear manufacturing. | 15th Jan 1940 | Box 136 \ 5 scan0338 | |
| Guide on the correct procedure and importance of sharpening hobs, page 5. | 15th Jan 1940 | Box 136 \ 5 scan0339 | |
| Hob centering gages and the causes and remedies for visible flats on gear teeth. | 15th Jan 1940 | Box 136 \ 5 scan0340 | |
| The process and importance of hob setting for precision gears. | 15th Jan 1940 | Box 136 \ 5 scan0341 | |
| Page detailing gear hobbing techniques, machine condition, and hob positioning. | 15th Jan 1940 | Box 136 \ 5 scan0342 | |
| Page describing the nomenclature of hob terms, noting that certain photographs are excluded from mimeographed copies. | 15th Jan 1940 | Box 136 \ 5 scan0343 | |
| Diagrams and tables detailing involute gear design, hobbing, and manufacturing limits. | 15th Jan 1940 | Box 136 \ 5 scan0344 | |
| Calculations and diagrams for gear hobbing, including setup, modification, and teeth contact. | 15th Jan 1940 | Box 136 \ 5 scan0345 | |
| Inspection charts for a gear hob, showing lead and modified tooth form. | 15th Jan 1940 | Box 136 \ 5 scan0346 | |
| Formula sheet for setting a hob pressure angle checking fixture, with examples for straight and spiral gash hobs. | 15th Jan 1940 | Box 136 \ 5 scan0347 | |
| Diagrams illustrating gear hobbing, showing cutting zones, lines of action, and hob teeth. | 15th Jan 1940 | Box 136 \ 5 scan0348 | |
| Guide for estimating the time required for hobbing gears, with formulas and a cutting speeds table. | 15th Jan 1940 | Box 136 \ 5 scan0349 | |
| Chart and diagrams detailing the recommended length and features of worm gear hobs. | 5th Apr 1940 | Box 136 \ 5 scan0350 | |
| Use of high helix angle gears for reducing noise in gearboxes. | 5th Apr 1940 | Box 136 \ 5 scan0351 | |
| New aluminium timing gears based on the Lincoln Zephyr camshaft wheel design. | 10th Aug 1940 | Box 136 \ 5 scan0352 | |
| Requesting a review of documents PL.280 and PL.373 concerning the second-speed synchromesh. | 21th Oct 1940 | Box 136 \ 5 scan0353 | |
| Cover letter from Rm. to Lov. regarding an order for gears and an attached reply from Olley in America. | 5th Jun 1941 | Box 136 \ 5 scan0354 | |
| Requesting assistance in obtaining sample gears that have arrived at Prestwick Aerodrome. | 23th Jul 1941 | Box 136 \ 5 scan0355 | |
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