| Description | Date | Identifier | |
| Quotation from George Angus & Company, Limited for Durangus rough sawn and moulded gear blanks. | 9th Nov 1937 | Box 136 \ 1 scan0254 | |
| Letter from Ford Motor Company acknowledging receipt of Fabroil A material for engine timing gear testing. | 11th Nov 1937 | Box 136 \ 1 scan0255 | |
| Laboratory report from Ford Motor Company regarding the unsuitability of a material for gear construction. | 17th Nov 1937 | Box 136 \ 1 scan0256 | |
| Letter from Ford Motor Company Limited discussing the physical condition and wear patterns of gears, specifically addressing 'cross-bearing' and 'stepping' phenomena. | 17th Nov 1937 | Box 136 \ 1 scan0257 | |
| Close-up photograph showing a crack in a textured, woven material. | 17th Nov 1937 | Box 136 \ 1 scan0258 | |
| Microscopic photograph showing the cross-section of a corrugated or fibrous material. | 17th Nov 1937 | Box 136 \ 1 scan0259 | |
| Micrograph showing a crack in a material, highlighted with a red annotation. | 25th Nov 1937 | Box 136 \ 1 scan0260 | |
| Letter to Ford Motor Co. regarding a report on a timing gear wear problem. | 25th Nov 1937 | Box 136 \ 1 scan0261 | |
| Letter to Attwater & Sons to discuss supplying laminated phenonil timing gear blanks. | 16th Dec 1937 | Box 136 \ 1 scan0262 | |
| Letter from Attwater & Sons confirming a suitable meeting time. | 17th Dec 1937 | Box 136 \ 1 scan0263 | |
| Letter to Messrs. Attwater & Sons arranging a meeting. | 18th Dec 1937 | Box 136 \ 1 scan0264 | |
| Letter to Ford Motor Co. Ltd. inquiring about their experience with Bakelite timing gears with die-cast aluminium centres. | 24th Dec 1937 | Box 136 \ 1 scan0265 | |
| Letter from Ford Motor Company regarding the composition and use of Bakelite timing gears. | 31th Dec 1937 | Box 136 \ 1 scan0266 | |
| Letter regarding an enquiry about Celoron non-metallic timing gears for a Phantom lll chassis. | 4th Jan 1938 | Box 136 \ 1 scan0267 | |
| Letter addressing rapid gear wear, noting a design problem and the preference for British materials. | 5th Jan 1938 | Box 136 \ 1 scan0268 | |
| Letter to Messrs. Attwater & Sons discussing design options for moulded gear blanks and die-cast aluminium centres. | 5th Jan 1938 | Box 136 \ 1 scan0269 | |
| Letter to Messrs. Attwater & Sons regarding the shape of a gear blank and preparation of new drawings. | 5th Jan 1938 | Box 136 \ 1 scan0270 | |
| Letter from Attwater & Sons regarding the manufacture and potential issues with Bakelite Fabric Gear Blanks. | 6th Jan 1938 | Box 136 \ 1 scan0271 | |
| Letter to Messrs. Attwater & Sons arranging a meeting regarding aluminium die cast centres for gear blanks. | 11th Jan 1938 | Box 136 \ 1 scan0272 | |
| Letter from Attwater & Sons confirming a convenient meeting time. | 12th Jan 1938 | Box 136 \ 1 scan0273 | |
| Confirmation to create detailed drawings for Phantom III and Wraith Brakelith timing gears. | 18th Jan 1938 | Box 136 \ 1 scan0274 | |
| Quieting the timing gears on experimental Wraith III units, addressing 'whine' and 'rattle' issues. | 19th Jan 1938 | Box 136 \ 1 scan0275 | |
| The effectiveness of a cam balancer in reducing gear rattle, concluding it can be discarded for cost savings. | 19th Jan 1938 | Box 136 \ 1 scan0276 | |
| Analysis of a rattle noise occurring at 1500 r.p.m. traced to the fan pulley drive and crankshaft torsional oscillations. | 19th Jan 1938 | Box 136 \ 1 scan0277 | |
| Request to modify the Wraith timing gears. | 21th Jan 1938 | Box 136 \ 1 scan0278 | |
| Instruction memo detailing modifications to the Camshaft and Idler gear for Wraith III and Phantom III chassis. | 26th Jan 1938 | Box 136 \ 1 scan0279 | |
| Parts changes for the Camshaft and Idler Gear on the Wraith III and Phantom III chassis. | 26th Jan 1938 | Box 136 \ 1 scan0280 | |
| Test report on the Wraith III engine gears for a No.6 unit experimental engine. | 3rd Feb 1938 | Box 136 \ 1 scan0281 | |
| Re-design of the Wraith & Phantom III timing gears to omit the balancing cam. | 3rd Feb 1938 | Box 136 \ 1 scan0282 | |
| Official order for six Ph.III idler gear blanks from Messrs. Attwater & Sons. | 4th Feb 1938 | Box 136 \ 1 scan0283 | |
| Letter to a supplier regarding drawings and sample production for a Phantom III timing gear. | 4th Feb 1938 | Box 136 \ 1 scan0284 | |
| Letter to Messrs. Attwater & Sons requesting a sample of a gear with forged teeth supplied to Fords. | 4th Feb 1938 | Box 136 \ 1 scan0285 | |
| Letter from Attwater & Sons regarding the examination of drawings, the creation of a mould, and the delivery of samples. | 7th Feb 1938 | Box 136 \ 1 scan0286 | |
| Design details for the Bentley 50 timing gears and the front end of the crankcase. | 10th Mar 1938 | Box 136 \ 1 scan0287 | |
| Letter to a supplier regarding the redesign of a larger timing gear, enclosing new prints and requesting a sample mould. | 16th Mar 1938 | Box 136 \ 1 scan0288 | |
| Official order for six Wraith camshaft gear blanks be sent to Messrs. Attwater & Sons. | 16th Mar 1938 | Box 136 \ 1 scan0289 | |
| Letter from Attwater & Sons confirming two moulds are made and awaiting inserts. | 23th Mar 1938 | Box 136 \ 1 scan0290 | |
| The production of redesigned Wraith timing gear samples. | 25th Mar 1938 | Box 136 \ 1 scan0291 | |
| Official order for 6 special springs for the Wraith model. | 1st Apr 1938 | Box 136 \ 1 scan0292 | |
| Proposal to test stiffer springs in the Wraith III timing gears to address excessive wear on the camshaft driving wheel. | 13th Apr 1938 | Box 136 \ 1 scan0293 | |
| Investigations into timing gear rattles and potential solutions. | 2nd May 1938 | Box 136 \ 1 scan0294 | |
| Tests on a Big Bentley crankshaft damper and spring drive to eliminate gear rattle. | 13th Dec 1933 | Box 136 \ 1 scan0295 | |
| Testing various damper and spring drive configurations to control oscillation and rattle at different engine speeds. | 13th Dec 1933 | Box 136 \ 1 scan0296 | |
| Tests on a spring drive to eliminate engine gear rattle and oscillations. | 13th Dec 1933 | Box 136 \ 1 scan0297 | |
| Camshaft gear deflection in the Wraith & B.III timing gears after endurance running. | 2nd Jul 1938 | Box 136 \ 1 scan0298 | |
| The investigation into timing gear failures and proposed endurance tests for a solution. | 11th Jul 1938 | Box 136 \ 1 scan0299 | |
| Investigation into camshaft oscillations on the Wraith III engine. | 1st Jul 1938 | Box 136 \ 1 scan0300 | |
| Modifications to a dynamo coupling to reduce oscillation amplitude and uneven wear. | 11th Jul 1938 | Box 136 \ 1 scan0301 | |
| Graph showing camshaft torsional vibrations for the Wraith II engine under different conditions. | 6th Oct 1938 | Box 136 \ 1 scan0302 | |
| Requesting the machining of three Phantom III idler timing gears for trials. | 6th Oct 1938 | Box 136 \ 1 scan0303 | |
| Letter from The Reay Gearworks Ltd regarding their fabric-based 'Peak' Pinions for noise reduction. | 10th Oct 1938 | Box 136 \ 1 scan0304 | |
| Letter from The Reay Gearworks Ltd. regarding a sample 'Peak' blank for inspection. | 12th Oct 1938 | Box 136 \ 1 scan0305 | |
| Promotional leaflet from The Reay Gearworks Ltd featuring customer testimonials for 'Peak' Pinions. | 17th Oct 1928 | Box 136 \ 1 scan0306 | |
| Promotional leaflet for 'Peak' non-metallic pinions, detailing their material properties, benefits, and applications. | 18th Oct 1938 | Box 136 \ 1 scan0307 | |
| Follow-up letter concerning a quotation for Fabroil Gear Blanks. | 18th Oct 1938 | Box 136 \ 1 scan0308 | |
| Letter to The British Thomson-Houston Company Ltd. concerning the matter of Fabroil Gear Blanks. | 21th Oct 1938 | Box 136 \ 1 scan0309 | |
| Acknowledgement of a letter concerning Fabroil Gear Blanks. | 22th Oct 1938 | Box 136 \ 1 scan0310 | |
| Letter to supplier Attwater & Sons Ltd. requesting manufacturing specifications for timing gear blanks. | 1st Mar 1940 | Box 136 \ 1 scan0311 | |
| Proposal to test gear blanks to destruction to determine a minimum load. | 1st Mar 1940 | Box 136 \ 1 scan0312 | |
| Letter from Attwater & Sons Ltd. providing specifications for moulded fabric gears. | 2nd Mar 1940 | Box 136 \ 1 scan0313 | |
| Analysis of camshaft drive failure, calculating tooth load and stress on a fabroil gear and chain drive. | 12th Apr 1940 | Box 136 \ 1 scan0314 | |
| Discussion of possible timing gear and camshaft drive schemes for the B60 engine. | 12th Apr 1940 | Box 136 \ 1 scan0315 | |
| Analysis of stresses in helical fabroil gears, outlining assumptions and formulas for comparative figures. | 12th Apr 1940 | Box 136 \ 1 scan0316 | |
| Page of calculations for determining the arc of contact and number of teeth in contact for gears. | 12th Apr 1940 | Box 136 \ 1 scan0317 | |
| Diagrams illustrating forces, angles, and loads on helical gear teeth. | 12th Apr 1940 | Box 136 \ 1 scan0318 | |
| Hand-drawn diagram illustrating the geometry of two meshing gears on graph paper. | 13th Apr 1940 | Box 136 \ 1 scan0319 | |
| Requesting the despatch of a new set of hypoid axle gears to Messrs. David Brown & Sons Ltd. for photography. | 13th Apr 1940 | Box 136 \ 1 scan0320 | |
| Letter to David Brown & Sons Ltd. regarding the loan of a pinion and crownwheel from a Bentley chassis for an article illustration. | 15th Apr 1940 | Box 136 \ 1 scan0321 | |
| Despatching a bevel pinion and bevel wheel on loan to Messrs. David Brown & Sons Ltd. | 16th Apr 1940 | Box 136 \ 1 scan0322 | |
| Correspondence from David Brown & Sons regarding the return of loaned Spiral Bevel Gears. | 18th Apr 1940 | Box 136 \ 1 scan0323 | |
| Confirming the return of a gear and pinion loaned to Messrs. David Brown for photographing. | 22th Apr 1940 | Box 136 \ 1 scan0324 | |
| Information on aluminium timing gears from the USA and considering their use. | 25th Apr 1940 | Box 136 \ 1 scan0325 | |
| Replacement of a fabroil timing gear with a cast aluminium helical gear. | 3rd May 1940 | Box 136 \ 1 scan0326 | |
| The examination of a sample aluminium timing gear from America before detailing part PL. 215. | 9th May 1940 | Box 136 \ 1 scan0327 | |
| The detailed design of an aluminium timing gear (P.L.215) and comparison to a fabroil gear. | 15th May 1940 | Box 136 \ 1 scan0328 | |
| Specification limits for the chemical analysis and hardness of Cast Aluminium Alloy Timing Gears used on the Lincoln Zephyr. | 9th Oct 1940 | Box 136 \ 1 scan0329 | |
| Letter from Ransome & Marles Bearing Co. regarding cup and cone bearings made by New Departure. | 12th Jan 1939 | Box 136 \ 2 scan0001 | |
| Specification sheet for front hub bearings, detailing dimensions, parts, and load capacities. | 9th Jan 1939 | Box 136 \ 2 scan0002 | |
| Letter to F.O. Hickling of Ransome & Marles Bearing Co. regarding angular contact hub bearings and Duplex bearings for gearbox design. | 13th Jan 1939 | Box 136 \ 2 scan0003 | |
| Inquiry to Overdrive Gears Ltd. regarding the operation of their overdrive system. | 16th Jan 1939 | Box 136 \ 2 scan0004 | |
| Telegram from Normanville to Roycar Derby rescheduling a meeting due to poor road conditions. | 25th Jan 1939 | Box 136 \ 2 scan0005 | |
| Proposed design change for a combined gearbox dipstick and oil filler plug. | 16th Jan 1939 | Box 136 \ 2 scan0006 | |
| Letter from Overdrive Gears Ltd. responding to an inquiry and explaining the functionality of their overdrive system. | 18th Jan 1939 | Box 136 \ 2 scan0007 | |
| Letter from Ransome & Marles Bearing Co. regarding the test results of a Duplex Double Purpose Bearing. | 19th Jan 1939 | Box 136 \ 2 scan0008 | |
| Letter to Overdrive Gears Ltd. regarding a meeting to see a car fitted with their gearbox. | 20th Jan 1939 | Box 136 \ 2 scan0009 | |
| Letter from Overdrive Gears Ltd. regarding a demonstration car meeting and a potential aeronautical apparatus demonstration for V.P. Propellers. | 23th Jan 1939 | Box 136 \ 2 scan0010 | |
| Letter to Ransome & Marles Bearing Co. Ltd. regarding the suitability of a Duplex bearing. | 23th Jan 1939 | Box 136 \ 2 scan0011 | |
| Secret internal memorandum discussing the development and issues of the gearbox for the rationalised programme. | 23th Jan 1938 | Box 136 \ 2 scan0012 | |
| Design, costs, and feasibility of a new gearbox, comparing it to the Wraith box. | 23th Jan 1939 | Box 136 \ 2 scan0013 | |
| Summary report discussing cost savings and production plans for new gearboxes, comparing the B.5 and B.V. boxes to the older Wraith box. | 23th Jan 1939 | Box 136 \ 2 scan0014 | |
| Comparison table of gearbox weights and costs for various car models, with related commentary. | 23th Jan 1939 | Box 136 \ 2 scan0015 | |
| Blueprint showing brake gear complications due to the Wraith gearbox and the BV brake mechanism. | 23th Jan 1939 | Box 136 \ 2 scan0016 | |
| Requesting the dispatch of bolts, nuts, and washers to Messrs Ferodo Limited for a fan test rig. | 23th Jan 1939 | Box 136 \ 2 scan0017 | |
| Design of a one-piece filler plug and dipstick for a gearbox. | 23th Jan 1939 | Box 136 \ 2 scan0018 | |
| Internal request to order two sets of Rollers and Roller Cages for experimental purposes from The Ribbesford Co. Ltd. | 24th Jan 1939 | Box 136 \ 2 scan0019 | |
| Letter to Overdrive Gears Ltd. about postponing a visit due to snow. | 25th Jan 1939 | Box 136 \ 2 scan0020 | |
| Telegram received by telephone rescheduling a meeting due to impossible road conditions. | 25th Jan 1939 | Box 136 \ 2 scan0021 | |
| Telegram received by telephone postponing an appointment due to impossible road conditions. | 25th Jan 1939 | Box 136 \ 2 scan0022 | |
| Letter to Super Oil Seals Mfg. Co. Ltd. requesting three 'Perfect' oil seals with specific dimensions. | 25th Jan 1939 | Box 136 \ 2 scan0023 | |
| Letter from Overdrive Gears Ltd. apologising for having to cancel a visit due to bad road conditions and arranging a new time. | 26th Jan 1939 | Box 136 \ 2 scan0024 | |
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