| Description | Date | Identifier | |
| Measurements of the parallelism and 'skew' errors of timing gear axes on a Bentley Unit (B-4). | 18th May 1935 | Box 136 \ 1 scan0154 | |
| Letter to The British Thompen-Houston Co. Ltd. regarding a failure of Fabroil Gears. | 30th May 1935 | Box 136 \ 1 scan0155 | |
| Follow-up letter from The Morse Chain Company regarding tests on their Timing Chain Drives. | 12th Aug 1935 | Box 136 \ 1 scan0156 | |
| Letter to The Morse Chain Co. Ltd. concerning a delay in testing their timing chain drive. | 13th Aug 1935 | Box 136 \ 1 scan0157 | |
| Requesting payment for an invoice from The British Thomson-Houston Company Ltd. for two Fabroil Gears. | 3rd Oct 1935 | Box 136 \ 1 scan0158 | |
| Official order for two Fabroil Gears from the British Thomson-Houston Co. Ltd. | 5th Oct 1935 | Box 136 \ 1 scan0159 | |
| List of tests and results to overcome drive to overrun transmission chunking. | 18th Oct 1935 | Box 136 \ 1 scan0160 | |
| Test results table comparing gearbox performance and settings on various cars. | 18th Oct 1935 | Box 136 \ 1 scan0161 | |
| Test report on clutch splines, axle backlash, and gearbox chunking issues on a 30-EX model. | 18th Oct 1935 | Box 136 \ 1 scan0162 | |
| Fitting of 45° timing gears to B-15, B-9, and B-19 units, and specifications for dynamo gears for 20/25 and Bentley models. | 14th Nov 1935 | Box 136 \ 1 scan0163 | |
| Letter from British Thomson-Houston Company Ltd regarding the failure of a Fabroil Timing Gear. | 23th Nov 1935 | Box 136 \ 1 scan0164 | |
| Letter to The British Thomson-Houston Co. Ltd. regarding a serious failure of Fabroil timing gears on a 12-cylinder engine. | 22th Nov 1935 | Box 136 \ 1 scan0165 | |
| Letter from The British Thomson-Houston Company Ltd discussing the material failure of a gear due to low fabric content. | 27th Nov 1935 | Box 136 \ 1 scan0166 | |
| Despatch of ten sets of Bentley Fabroil timing gears and a hold on further orders pending compatibility checks with the 'big bore' design. | 13th Dec 1935 | Box 136 \ 1 scan0167 | |
| Inability to fit Fabroil timing gears to the Bentley 'big bore' engine without revised designs. | 18th Dec 1935 | Box 136 \ 1 scan0168 | |
| Standardisation of parts report for Textolite/Fabroil timing gears. | 15th Nov 1935 | Box 136 \ 1 scan0169 | |
| Cost estimation and comparison for introducing a new part, including tooling costs for the 'G' series chassis. | 12th Aug 1935 | Box 136 \ 1 scan0170 | |
| The development of backlash in Fabroil timing gears for a Bentley. | 17th Dec 1935 | Box 136 \ 1 scan0171 | |
| Diagram of the Bentley 7 Unit wheel case gears, detailing backlash measurements and material specifications. | 7th Dec 1935 | Box 136 \ 1 scan0172 | |
| The successful testing of Bentley Fabroil Timing Gears and a note on the cost reduction. | 6th Jan 1936 | Box 136 \ 1 scan0173 | |
| Summary of an investigation into gear noise on Bentley & 20/25 engines, focusing on the wheelcase, crankcase, and engine gears. | 15th Jan 1936 | Box 136 \ 1 scan0174 | |
| Issues with gearcutting and lapping processes, with conclusions for camwheel and crankcase production. | 15th Jan 1936 | Box 136 \ 1 scan0175 | |
| Investigation summary regarding the wheelcase and gears for the Bentley and 20/25 models. | 31th Jan 1936 | Box 136 \ 1 scan0176 | |
| Conclusions on gear train noise, identifying the dynamo pinion as the source and discussing potential design solutions. | 31th Jan 1936 | Box 136 \ 1 scan0177 | |
| Responding to an investigation into failures of Bentley & 20/25-HP engine gears. | 3rd Feb 1936 | Box 136 \ 1 scan0178 | |
| Technical report on camwheel machining, gear tolerances, and an investigation into gear distortion on a Bentley engine. | 3rd Feb 1936 | Box 136 \ 1 scan0179 | |
| Machine maintenance, gear lapping, and checking the alignment of crankcase bores. | 3rd Feb 1936 | Box 136 \ 1 scan0180 | |
| The balancing cam fitted to the Bentley & 25 HP timing gears. | 27th Mar 1936 | Box 136 \ 1 scan0181 | |
| The balancing cam used on Bentley & 25 HP timing gears, noting production numbers and reliability. | 27th Mar 1936 | Box 136 \ 1 scan0182 | |
| Use of Textolite timing gears for Bentley and 20/25 engines. | 28th Mar 1936 | Box 136 \ 1 scan0183 | |
| Blueprint comparing balancing cams for Bentley I, Bentley II, 20/25, 25/29, and 'Big Bore' models. | 30th Mar 1936 | Box 136 \ 1 scan0184 | |
| Testing and potential adoption of Fabroil timing gears on 3½ Litre Bentley Chassis. | 28th Oct 1936 | Box 136 \ 1 scan0185 | |
| Proposal to redesign the Phantom III engine front end to simplify dismantling of the timing gears. | 29th Oct 1936 | Box 136 \ 1 scan0186 | |
| Trial fitting of Fabroil timing gears to 3 1/2 Litre Bentley chassis and the effectiveness of the cam balancing device. | 30th Oct 1936 | Box 136 \ 1 scan0187 | |
| The testing and wear of an Idler Gear Wheel E 87346 made of Fabroil 'A'. | 9th Nov 1936 | Box 136 \ 1 scan0188 | |
| Bentley Fabroil Timing Gears and a review of standardisation sheets. | 11th Nov 1936 | Box 136 \ 1 scan0189 | |
| Letter to British Thomson-Houston Co. regarding excessive wear on a Phantom III engine's Fabroil timing gear. | 14th Nov 1936 | Box 136 \ 1 scan0190 | |
| Letter from The British Thomson-Houston Company Ltd confirming a meeting with the Experimental Department. | 16th Nov 1936 | Box 136 \ 1 scan0191 | |
| Distortion issues with Idler Gears for 25/30 & Bentley engines, recommending a softer SZNX material as a solution. | 10th Dec 1936 | Box 136 \ 1 scan0192 | |
| Letter about a special fine mesh fabric 'Fabroil' gear blank being sent for testing due to excessive wear on a previous part. | 22th Dec 1936 | Box 136 \ 1 scan0193 | |
| Letter to The British Thomson-Houston Co. Ltd. requesting another fine mesh fabric gear blank for testing and a cost estimate for standardization. | 22th Dec 1936 | Box 136 \ 1 scan0194 | |
| Instruction to machine and fit a new Fabroil timing gear blank to Phantom III Unit No.14. | 22th Dec 1936 | Box 136 \ 1 scan0195 | |
| Extract from a letter from the Rover Co. concerning noisy timing gears. | 23th Dec 1936 | Box 136 \ 1 scan0196 | |
| Letter from The British Thomson-Houston Company Ltd confirming an order for a second special blank for Fabroil Gears. | 29th Dec 1936 | Box 136 \ 1 scan0197 | |
| The composition, properties, and manufacturing procedure for Clyde Alloy Steel used in gears. | 19th Jan 1937 | Box 136 \ 1 scan0198 | |
| Quotation from The British Thomson-Houston Company Ltd for Fabroil-A gear blanks. | 19th Jan 1937 | Box 136 \ 1 scan0199 | |
| Page two of a letter from The British Thomson-Houston Company, Limited requesting test results. | 19th Jan 1937 | Box 136 \ 1 scan0200 | |
| Suggestion regarding the material for timing gears on the New Wraith engine unit. | 3rd Feb 1937 | Box 136 \ 1 scan0201 | |
| Request to place an official order for two special Fabroil timing gear blanks for use on the Ph.III. | 29th Apr 1937 | Box 136 \ 1 scan0202 | |
| Letter to The British Thomson-Houston Co. Ltd. requesting two special Fabroil timing gear blanks for test cars. | 28th Apr 1937 | Box 136 \ 1 scan0203 | |
| Letter from British Thomson-Houston Co. Ltd regarding the dispatch of an order for Fabroil 'A' Timing Gear Blanks. | 29th Apr 1937 | Box 136 \ 1 scan0204 | |
| Letter from The British Thomson-Houston Company Ltd confirming an order for special Fabroil timing gear blanks. | 30th Apr 1937 | Box 136 \ 1 scan0205 | |
| Letter to The British Thomson-Houston Co., Ltd. clarifying a misunderstanding over order numbers. | 30th Apr 1937 | Box 136 \ 1 scan0206 | |
| Letter from The British Thomson-Houston Company correcting an error regarding an order and confirming the completion date for Fabroil Blanks. | 3rd May 1937 | Box 136 \ 1 scan0207 | |
| On the satisfactory performance and new hardness standardisation for engine timing gears after a 16,000-mile test. | 27th May 1937 | Box 136 \ 1 scan0208 | |
| The testing of Fabroil gears and the potential use of unhardened steel gears on the Phantom III and Wraith models. | 31th May 1937 | Box 136 \ 1 scan0209 | |
| Noisy timing gears on the Wraith engine, discussing potential causes and measurement issues. | 14th Jun 1937 | Box 136 \ 1 scan0210 | |
| Examination of Wraith III Unit No.1 timing gears to investigate the cause of a whine. | 14th Jun 1937 | Box 136 \ 1 scan0211 | |
| Development of equipment for measuring Wraith timing gears and a response to production criticism. | 17th Jun 1937 | Box 136 \ 1 scan0212 | |
| Request to send a section of a Phantom III idler timing gear to The Continental-Diamond Fibre Co. in the USA. | 19th Jun 1937 | Box 136 \ 1 scan0213 | |
| Letter regarding wear on a Phantom III timing gear and a request for Celeron material blanks for testing. | 19th Jun 1937 | Box 136 \ 1 scan0214 | |
| Cover note for a section of a Ph.III Fabroil Timing Gear sent to The Continental Diamond Fibre Co. for investigation. | 21th Jun 1937 | Box 136 \ 1 scan0215 | |
| Proposal for rig tests on Ph.III timing gears due to wear on the Fabroil idler gear, detailing the required rig modifications. | 21th Jun 1937 | Box 136 \ 1 scan0216 | |
| Requesting the detailing of three sets of new timing gears for the Wraith with an increased helix angle. | 22th Jun 1937 | Box 136 \ 1 scan0217 | |
| Letter to Bakelite Limited enquiring about moulded gear blanks made from laminated Phenolic material for use in Phantom III engine timing gears. | 24th Jun 1937 | Box 136 \ 1 scan0218 | |
| Inquiry to a supplier regarding moulded gear blanks made from laminated phenolic material for car engine timing gears. | 24th Jun 1937 | Box 136 \ 1 scan0219 | |
| Inquiry about manufacturing moulded gear blanks from laminated Phenolic material for the Phantom III engine. | 24th Jun 1937 | Box 136 \ 1 scan0220 | |
| Letter from Witton Moulded Insulation Works suggesting communication with Messrs Bakelite Limited regarding a specific material. | 25th Jun 1937 | Box 136 \ 1 scan0221 | |
| Letter from Bakelite Limited acknowledging receipt of a letter and advising that they will communicate further shortly. | 25th Jun 1937 | Box 136 \ 1 scan0222 | |
| Clarifying the material condition and manufacturing process for Wraith timing gears. | 29th Jun 1937 | Box 136 \ 1 scan0223 | |
| Letter from George Angus & Co. regarding the inability to supply moulded gear blanks and offering an alternative. | 30th Jun 1937 | Box 136 \ 1 scan0224 | |
| Letter from Bakelite Limited regarding sample materials for timing gears. | 5th Jul 1937 | Box 136 \ 1 scan0225 | |
| Requesting compression tests on specimens cut from Coleron and Fabroil timing gears. | 6th Jul 1937 | Box 136 \ 1 scan0226 | |
| The re-specification of an engine required for Phantom III timing gear tests. | 12th Jul 1937 | Box 136 \ 1 scan0227 | |
| The re-specification of an engine required for Phantom III timing gear tests. | 12th Jul 1937 | Box 136 \ 1 scan0228 | |
| Letter from George Angus & Co. regarding a proposed Durangus spiral wheel construction and enclosing a sketch. | 13th Jul 1937 | Box 136 \ 1 scan0229 | |
| Steering and timing gear specifications for the Wraith III chassis. | 15th Jul 1937 | Box 136 \ 1 scan0230 | |
| Letter to George Angus & Co. Ltd. regarding the testing of 'Durangus' material for Phantom III timing gears. | 10th Jul 1937 | Box 136 \ 1 scan0231 | |
| Letter from George Angus & Co. Ltd. confirming the preparation of Durangus Blanks for testing. | 19th Jul 1937 | Box 136 \ 1 scan0232 | |
| Standardisation of a Dynamo Pinion and Idler Gear due to difficulty in production. | 29th May 1937 | Box 136 \ 1 scan0233 | |
| Estimated cost for new tools relating to the S2 Series chassis. | 28th May 1937 | Box 136 \ 1 scan0234 | |
| Standardisation of a Dynamo Pinion & Idler Gear due to difficulty in production after hardening. | 28th May 1937 | Box 136 \ 1 scan0235 | |
| Estimated cost of new tools for a 25/30HP Chassis Standardisation Sheet X. | 26th Aug 1937 | Box 136 \ 1 scan0236 | |
| Examination report on the timing gears of Wraith Unit No. 5 after a period of running time. | 26th Aug 1937 | Box 136 \ 1 scan0237 | |
| Production issues, helix errors, and required tolerances for Wraith timing gears. | 30th Aug 1937 | Box 136 \ 1 scan0238 | |
| Request to build a trestle for a Wraith III engine for timing gear tests. | 1st Sep 1937 | Box 136 \ 1 scan0239 | |
| Letter from the Continental Diamond Fibre Company regarding gear blank wear, design problems, and manufacturing locations. | 17th Jul 1937 | Box 136 \ 1 scan0240 | |
| Letter from George Angus & Company concerning the supply of two Durangus Gear Blanks for a Phantom III engine. | 13th Sep 1937 | Box 136 \ 1 scan0241 | |
| Letter discussing the endurance test results for special fine mesh Fabroil timing gears and a query about a price increase. | 16th Oct 1937 | Box 136 \ 1 scan0242 | |
| Letter regarding the wear resistance of Fabroil timing gears and arranging a follow-up meeting. | 18th Oct 1937 | Box 136 \ 1 scan0243 | |
| Letter to The British Thomson-Houston Co. Ltd. requesting a sample of Fabroil Sheet for mechanical testing. | 25th Oct 1937 | Box 136 \ 1 scan0244 | |
| Letter to George Angus & Co. Ltd. requesting the price for 'Durangus' gear blanks pending trial results. | 25th Oct 1937 | Box 136 \ 1 scan0245 | |
| Letter to Bakelite Ltd. requesting a price for gear blanks following trials. | 25th Oct 1937 | Box 136 \ 1 scan0246 | |
| Letter from George Angus & Co. Ltd. seeking clarification on the price required for Durangus Gear Blanks based on drawing E.86982. | 26th Oct 1937 | Box 136 \ 1 scan0247 | |
| Quotation from Bakelite Limited for blanks of laminated sheet. | 26th Oct 1937 | Box 136 \ 1 scan0248 | |
| Quotation for the supply of Fabroil-A timing gear blanks. | 27th Oct 1937 | Box 136 \ 1 scan0249 | |
| Letter from The British Thomson-Houston Company regarding the despatch of material blanks and a sample of Grade 1047 Fabroil Compound. | 27th Oct 1937 | Box 136 \ 1 scan0250 | |
| Request to send two samples of Fabroil timing gear material to the Ford Motor Co. Ltd. | 8th Nov 1937 | Box 136 \ 1 scan0251 | |
| Letter to Ford requesting the testing of Fabroil gear material samples for the Phantom III engine. | 8th Nov 1937 | Box 136 \ 1 scan0252 | |
| Quotation letter from gear makers George Angus and Co. for rough sawn and moulded blanks. | 9th Nov 1937 | Box 136 \ 1 scan0253 | |
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