| Description | Date | Identifier | |
| The performance of a double breaker ignition distributor and ongoing associated coil tests. | 28th Dec 1933 | Box 163 \ 7 img231 | |
| Graph showing the variation of make-ratio against speed for a double breaker ignition distributor. | 22th Feb 1935 | Box 163 \ 7 img232 | |
| Graph showing the variation of make-ratio with speed for a double breaker ignition distributor. | 14th Mar 1939 | Box 163 \ 7 img233 | |
| Use of metallic versus non-metallic bushes for contact breakers in Bentley and RR battery ignition systems. | 1st Jan 1934 | Box 163 \ 7 img234 | |
| Improvement in high-speed battery ignition for Spectre and Bentley models due to a new cam. | 2nd Jan 1934 | Box 163 \ 7 img235 | |
| Issue with a high-speed battery ignition cam for Spectre and Bentley models. | 4th Jan 1934 | Box 163 \ 7 img236 | |
| Testing and operation of the automatic charging and ignition system on a Phantom II Series chassis. | 5th Jan 1934 | Box 163 \ 7 img237 | |
| Letter to Delco-Remy & Hyatt Ltd. requesting a replacement for a cracked 12-cylinder ignition distributor head moulding. | 9th Jan 1934 | Box 163 \ 7 img238 | |
| Letter from Delco-Remy & Hyatt Ltd. regarding the sourcing of a Distributor Cap. | 10th Jan 1934 | Box 163 \ 7 img239 | |
| The performance of Delco-Remy, Lucas, and Spectre ignition coils and distributors. | 18th Jan 1934 | Box 163 \ 7 img240 | |
| Invoice from Delco-Remy & Hyatt Ltd. for a distributor cap. | 25th Jan 1934 | Box 163 \ 7 img241 | |
| Requesting settlement of an invoice from Messrs. Delco-Remy & Hyatt Ltd. | 26th Jan 1934 | Box 163 \ 7 img242 | |
| Return of two 12-volt ignition coils to be exchanged for two 6-volt coils. | 29th Jan 1934 | Box 163 \ 7 img243 | |
| Formidable challenges of the Spectre engine's battery ignition system. | 13th Feb 1934 | Box 163 \ 7 img244 | |
| Technical report discussing modifications and performance tests of ignition coils. | 13th Feb 1934 | Box 163 \ 7 img245 | |
| The satisfactory results of experiments with a new experimental coil and ballast, comparing its performance against a Delco-Remy system. | 13th Feb 1934 | Box 163 \ 7 img246 | |
| Graph comparing the volt-speed curves of various ignition coils under specific test conditions. | 10th Feb 1939 | Box 163 \ 7 img247 | |
| Graph showing the volt-speed curves of various ignition coils under specific test conditions. | 10th Dec 1934 | Box 163 \ 7 img248 | |
| Design and considerations for the Spectre engine's ignition system. | 15th Feb 1934 | Box 163 \ 7 img249 | |
| Letter from Delco-Remy Corporation concerning a 667-A distributor and a Cadillac starting motor test specification. | 22th Feb 1934 | Box 163 \ 7 img250 | |
| Design of the Spectre battery ignition system, including parts from Delco Remy. | 14th Mar 1934 | Box 163 \ 7 img251 | |
| Inquiry to Delco Remy & Hyatt Ltd. regarding the manufacturing location of their electrical equipment and a High Speed Ignition Coil. | 2nd May 1934 | Box 163 \ 7 img252 | |
| Letter from Delco-Remy & Hyatt Ltd. regarding their British-made ultra high-speed ignition equipment. | 7th May 1934 | Box 163 \ 7 img253 | |
| Letter to W.O. Kennington of Messrs. Delco-Remy & Hyatt Ltd. suggesting dates for a visit. | 17th May 1934 | Box 163 \ 7 img254 | |
| Letter from Delco-Remy & Hyatt Ltd. to H.E. West arranging a meeting in Derby. | 18th May 1934 | Box 163 \ 7 img255 | |
| Letter to Delco-Remy & Hyatt Ltd. requesting a specific double breaker distributor for a Bentley chassis and discussing plans for aero engine ignition systems. | 25th May 1934 | Box 163 \ 7 img256 | |
| Letter from Delco-Remy & Hyatt Ltd. requesting engineering specifications for distributor samples for the Bentley Chassis. | 28th May 1934 | Box 163 \ 7 img257 | |
| Request to discreetly obtain a Delco-Remy 8-cylinder ignition distributor from a Graham Paige Custom 8. | 27th Jun 1934 | Box 163 \ 7 img258 | |
| Letter confirming an order for a Distributor for a Graham-Paige from the U.S.A. | 30th Jun 1934 | Box 163 \ 7 img259 | |
| Letter from Delco-Remy & Hyatt Ltd. inquiring about a supercharged Graham-Paige motorcar and ignition equipment. | 11th Jul 1934 | Box 163 \ 7 img260 | |
| Letter to Delco Remy & Hyatt Ltd. concerning the disposal of a Graham-Paige car and the testing of an engine unit. | 13th Jul 1934 | Box 163 \ 7 img261 | |
| Letter from Delco-Remy & Hyatt Ltd. discussing the Graham-Paige and the performance of ignition systems. | 17th Jul 1934 | Box 163 \ 7 img262 | |
| Letter to Graham Paige regarding a delay in the arrival of an ignition distributor part ordered from Delco-Remy & Hyatt Ltd. | 2nd Aug 1934 | Box 163 \ 7 img263 | |
| Request to issue a covering order for two distributor caps supplied by the Delco-Remy Company for a 'Spectre' Chassis. | 9th Aug 1934 | Box 163 \ 7 img264 | |
| Confirming the sending of a requested Graham-Paige distributor. | 13th Aug 1934 | Box 163 \ 7 img265 | |
| Letter from Delco-Remy & Hyatt Ltd. to Mr. H. E. West regarding progress on various tests. | 3rd Sep 1934 | Box 163 \ 7 img266 | |
| Letter to W.O. Kennington of Delco-Remy & Hyatt Ltd. regarding test delays on a car unit and progress on aero battery ignition sets. | 5th Sep 1934 | Box 163 \ 7 img267 | |
| Letter from Delco-Remy & Hyatt Ltd. regarding an oil pumping issue in a car unit and a potential modification. | 7th Sep 1934 | Box 163 \ 7 img268 | |
| Agreement to use a modified 20/25HP dynamo in place of a specially designed small generator for an ignition scheme. | 21th Nov 1934 | Box 163 \ 7 img269 | |
| Proposal for a manual detonation control lever to supplement the fully automatic ignition system. | 29th Jan 1935 | Box 163 \ 7 img270 | |
| Difficulties in correctly setting fully automatic ignition timing. | 31th Jan 1935 | Box 163 \ 7 img271 | |
| Secret internal memo requesting an order for Delco ignition components for a Wraith engine. | 17th Jan 1935 | Box 163 \ 7 img272 | |
| Letter from Delco-Remy & Hyatt Ltd. regarding the performance of Delco Ignition Controller Coils. | 28th Jun 1935 | Box 163 \ 7 img273 | |
| Page two of a letter from Delco-Remy & Hyatt, Ltd., discussing Delco ignition tests on Bentley or Rolls-Royce engines. | 1st Jun 1935 | Box 163 \ 7 img274 | |
| Internal order for electrical components required for a new battery ignition test rig. | 1st Jun 1935 | Box 163 \ 7 img275 | |
| Query for further details about a 'B' side ignition failure on a 3.S.1 model. | 2nd Jul 1935 | Box 163 \ 7 img276 | |
| Letter from Imperial Chemical Industries providing information on the resistivity of Paraffin Wax and Seekay Wax. | 2nd Sep 1935 | Box 163 \ 7 img277 | |
| Request to manufacture a Spectre Ignition Timing Plate. | 17th Sep 1935 | Box 163 \ 7 img278 | |
| Request to prepare a standard Bentley ignition distributor, fitted with a cam lubricator, for testing purposes. | 4th Nov 1935 | Box 163 \ 7 img279 | |
| Visit from the Managing Director of Delco-Remy & Hyatt to discuss coil ignition and radio interference. | 29th Nov 1935 | Box 163 \ 7 img280 | |
| Interference caused by a voltage regulator and efforts to resolve the issue. | 29th Nov 1935 | Box 163 \ 7 img281 | |
| Required testing for a Delco Remy Battery Ignition Head, focusing on friction, hysteresis, and drive slack. | 26th Feb 1936 | Box 163 \ 7 img282 | |
| Detonation tests conducted on a Bentley B-23-AE car to determine the correct curve for automatic advance. | 7th Apr 1936 | Box 163 \ 7 img283 | |
| Graph comparing ignition advance curves against vehicle speed in miles per hour. | 7th Apr 1936 | Box 163 \ 7 img284 | |
| Ignition curve graph for a deturbulated head with a 6.5-1 compression ratio. | 7th Apr 1936 | Box 163 \ 7 img285 | |
| Graph showing modifications to the Delco-Remy automatic ignition governor for a Bentley non-turbulent head. | 14th Jul 1936 | Box 163 \ 7 img286 | |
| Print showing an indicator for synchronizing the contact breakers on the Phantom III ignition system. | 14th Jul 1936 | Box 163 \ 7 img287 | |
| Rotor failures in the battery ignition for the Bentley & 25/30 HP chassis and the proposed fix. | 25th Aug 1936 | Box 163 \ 7 img288 | |
| Fault with the ignition warning light on 25 & 30 HP cars causing the dynamo not to charge. | 14th Jul 1936 | Box 163 \ 7 img289 | |
| Requesting a new portable microammeter for an ignition plug testing unit. | 26th Aug 1936 | Box 163 \ 7 img290 | |
| The decision to cease experimentation on Bluemel Ignition Tubes due to the expense. | 17th Sep 1936 | Box 163 \ 7 img291 | |
| Letter from Mallory Electric Corporation detailing a new ignition system for oil-burning engines. | 1st Sep 1936 | Box 163 \ 7 img292 | |
| Lesson from the Mallory Ignition Course on ignition for oil-burning and low-grade fuel engines. | 24th Apr 1936 | Box 163 \ 7 img293 | |
| Page 2 of the Mallory Ignition Course, Lesson No. 27, explaining the principle of operation for a special oil-burning ignition system. | 24th Apr 1936 | Box 163 \ 7 img294 | |
| On cable specifications, amp capacity, and availability of correct colors. | 31th Aug 1936 | Box 163 \ 7 img295 | |
| Internal request to place an order for a portable microammeter for ignition testing. | 31th Aug 1936 | Box 163 \ 7 img296 | |
| Issuance of blueprints and details for an experimental ignition coil for use with increased plug gaps. | 30th Sep 1936 | Box 163 \ 7 img297 | |
| Visit to Delco-Remy Ltd. discussing modifications for Bentley distributors, governors, and vacuum control. | 13th Nov 1936 | Box 163 \ 7 img298 | |
| Chevrolet specifications and observations on Aero Battery Ignition systems. | 13th Nov 1936 | Box 163 \ 7 img299 | |
| The replacement of an obsolete H.T. ignition wire. | 16th Nov 1936 | Box 163 \ 7 img300 | |
| Requesting the replacement of obsolete H.T. ignition wires on a Phantom III No.3 unit. | 1st Dec 1936 | Box 163 \ 7 img301 | |
| Aero battery ignition changeover switch, with conclusions for Merlin, Vulture, and Exe engines. | 1st Dec 1936 | Box 163 \ 7 img302 | |
| Laboratory test results for a modified aero battery ignition changeover switch. | 1st Dec 1936 | Box 163 \ 7 img303 | |
| Modifications for a 4-coil loading switch for use on Exe, Vulture, and Merlin engines. | 1st Dec 1936 | Box 163 \ 7 img304 | |
| Wiring diagram for a generator and battery circuit featuring a changeover switch. | 5th Dec 1936 | Box 163 \ 7 img305 | |
| Requesting the replacement of H.T. ignition wires with 'Helsby' wire for the C.15 Unit Sg's Car. | 5th Dec 1936 | Box 163 \ 7 img306 | |
| Substituting the cable in the Phantom III ignition system to handle a heavier current. | 2nd Dec 1936 | Box 163 \ 7 img307 | |
| Recommendation to improve the Phantom III L.T. ignition wires by making them oil-proof. | 14th Oct 1936 | Box 163 \ 7 img308 | |
| Request to obtain a copy of U.S. Patent number 2059243 for a special ignition system. | 25th Jan 1937 | Box 163 \ 7 img309 | |
| Urgent request for the production of an ignition governor and distributor for a deturbulated Bentley engine. | 19th Apr 1937 | Box 163 \ 7 img310 | |
| Adapting the battery ignition tower for the Wraith III engine to suit a different drive. | 27th May 1937 | Box 163 \ 7 img311 | |
| Alterations to ignition timing for the 25/30 HP engine to improve slow speed running. | 10th Jun 1937 | Box 163 \ 7 img312 | |
| Page two of a document discussing the replacement of a vacuum unit control for a throttle. | 10th Jun 1937 | Box 163 \ 7 img313 | |
| Standardisation of parts for the ventilation of the ignition governor. | 17th Jun 1937 | Box 163 \ 7 img314 | |
| Variation proposal to prevent the scouring of governors, including the cost of new tools and test results. | 26th Sep 1938 | Box 163 \ 7 img315 | |
| Implementation of automatic ignition controls on R.R. and Bentley chassis. | 4th Jun 1937 | Box 163 \ 7 img316 | |
| Notes on the measurement of peak potential from an alternating source, referencing an article from a 1919 magazine. | 14th Nov 1940 | Box 163 \ 7 img317 | |
| Technical notes on the required capacity of condenser C relative to valve V for a specified accuracy. | 14th Nov 1940 | Box 163 \ 7 img318 | |
| Letter from The National Physical Laboratory discussing methods for measuring peak voltage on a condenser. | 13th Oct 1937 | Box 163 \ 7 img319 | |
| Report cover page regarding the investigation of gearbox noise and vibration spectra, with an attached cover letter. | 19th Oct 1934 | Box 163 \ 7 img320 | |
| Request to obtain a booklet from Delco-Remy Ltd. giving details and dimensions of their ignition equipment. | 5th Apr 1938 | Box 163 \ 7 img321 | |
| Specification for H.T. ignition cables for R.R. and Bentley chassis engines. | 20th Jun 1938 | Box 163 \ 7 img322 | |
| The deletion of the hand ignition controls for the Phantom III model. | 20th Jun 1938 | Box 163 \ 7 img323 | |
| Requesting a modification to a front ignition tube for testing purposes. | 16th Jul 1938 | Box 163 \ 7 img324 | |
| Requesting a further test on a Commutator Breaker Earthing Brush to see if an all-metal version can eliminate sparking. | 28th Apr 1939 | Box 163 \ 7 img325 | |
| Letter to Metropolitan-Vickers Electrical Co. Ltd. regarding collaborative ignition investigations and test rig requirements. | 16th Jun 1939 | Box 163 \ 7 img326 | |
| Letter from Metropolitan-Vickers Electrical Co. discussing a research programme for a special electric drive and ignition cables. | 19th Jun 1939 | Box 163 \ 7 img327 | |
| Letter to Metropolitan Vickers Electrical Co. Ltd. arranging an engineer's visit and discussing enclosing high tension leads in a metal tube. | 22th Jun 1939 | Box 163 \ 7 img328 | |
| Letter to Metropolitan Vickers Electrical Co. Ltd. confirming investigations into ignition problems. | 4th Jul 1939 | Box 163 \ 7 img329 | |
| Design request for a belt-driven rig for testing contact breakers. | 5th Jul 1939 | Box 163 \ 7 img330 | |
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