| Description | Date | Identifier | |
| Strategy for competing with the 8 litre Bentley, considering a new 12-cylinder car. | 25th Feb 1931 | Box 65a \ 3 scan0275 | |
| Confidential memo discussing future product strategy concerning engine size, gearing, and performance. | 1st Mar 1931 | Box 65a \ 3 scan0276 | |
| Confidential memo from A.F. Sidgreaves regarding the urgency of developing new schemes to compete with Bentley. | 25th Mar 1931 | Box 65a \ 3 scan0277 | |
| Listing the five 'Worst Features' of the 40/50 Phantom II model for revision following discussions. | 6th Feb 1931 | Box 65a \ 3 scan0278 | |
| Proposal for experiments to increase the power output of the Phantom II engine. | 7th Apr 1931 | Box 65a \ 3 scan0279 | |
| Page 2 of a memo outlining design considerations for engine valve, carburetter, and exhaust systems. | 7th Apr 1931 | Box 65a \ 3 scan0280 | |
| Technical memorandum detailing proposed engine modifications for increased power output, specifically regarding exhausts, pistons, and camshafts. | 7th Apr 1931 | Box 65a \ 3 scan0281 | |
| Future car engine design, comparing 6-cylinder engines with 8 and 12-cylinder Vee engines. | 18th Apr 1931 | Box 65a \ 3 scan0282 | |
| Technical memorandum discussing engine and chassis design, comparing different cylinder configurations and competitor practices. | 18th Apr 1931 | Box 65a \ 3 scan0283 | |
| Engine vibration, knocking, and potential damper solutions for 6-cylinder engines. | 8th May 1931 | Box 65a \ 3 scan0284 | |
| Chassis work specifications for the 6-cylinder P.2 and J.1 models, covering present and future development. | 8th May 1931 | Box 65a \ 3 scan0285 | |
| Gear ratios, maximum speeds, and vehicle performance in comparison to Bentley. | 8th May 1931 | Box 65a \ 3 scan0286 | |
| Outlining arrangements for sending 25 HP and Phantom cars to France for testing. | 14th May 1931 | Box 65a \ 3 scan0287 | |
| Car specifications and parts required for tests in France. | 19th May 1931 | Box 65a \ 3 scan0288 | |
| Engine and body modifications for a 100 M.P.H. demonstration vehicle. | 20th May 1931 | Box 65a \ 3 scan0289 | |
| Conversion of Phantom IIs to Diamond engine mountings and testing a car in France. | 28th May 1931 | Box 65a \ 3 scan0290 | |
| Modifications for a 10,000-mile trial, covering engine balance weights, gear ratios, and suspension. | 30th May 1931 | Box 65a \ 3 scan0291 | |
| Experiments for a torque reaction damper and improved brakes with stiffer ribbed drums. | 30th May 1931 | Box 65a \ 3 scan0292 | |
| Engine power outputs and required improvements for the P.II, 25 HP, and Phantom engines. | 30th May 1931 | Box 65a \ 3 scan0293 | |
| Testing and performance of three different camshafts for Japan I power output. | 29th May 1931 | Box 65a \ 3 scan0294 | |
| Engine performance, valve timing, and silencer design modifications. | 6th Jun 1931 | Box 65a \ 3 scan0295 | |
| Progress and issues of a Phantom II W.W. conversion scheme. | 6th Jun 1931 | Box 65a \ 3 scan0296 | |
| Vehicle vibration, bonnet knocking, and steering issues, with proposed solutions involving torque reaction dampers. | 8th Jun 1931 | Box 65a \ 3 scan0297 | |
| Phantom II conversion scheme, including engine mounting designs and plans for extended testing in France. | 9th Jun 1931 | Box 65a \ 3 scan0298 | |
| Feasibility and design considerations for fitting a Phantom II with a 6:1 compression ratio cylinder head. | 1st Jun 1931 | Box 65a \ 3 scan0299 | |
| Outlining the design and development strategy for future car engines and transmissions. | 6th Jul 1931 | Box 65a \ 3 scan0300 | |
| Summary of minor troubles from a 10,000-mile test in France, detailing issues with exhaust valves and shock absorbers. | 5th Aug 1931 | Box 65a \ 3 scan0301 | |
| Issues and experiments related to steering, petrol pump vapour lock, suspension, and the battery box. | 5th Sep 1931 | Box 65a \ 3 scan0302 | |
| The testing and modification of the 25-EX experimental car. | 1st Aug 1931 | Box 65a \ 3 scan0303 | |
| Adjusting engine timing to reduce torque reaction vibrations. | 3rd Sep 1931 | Box 65a \ 3 scan0304 | |
| Required improvements and considerations for 25HP and 45HP car components. | 3rd Sep 1931 | Box 65a \ 3 scan0305 | |
| Engine performance, weighing top speed against other features. | 7th Sep 1931 | Box 65a \ 3 scan0306 | |
| Engine performance modifications for the Phantom II model, focusing on power output, valve timing, and components. | 7th Sep 1931 | Box 65a \ 3 scan0307 | |
| The specifications and performance of the 27-EX experimental car, sent for evaluation. | 27th Oct 1931 | Box 65a \ 3 scan0308 | |
| Production of twin carburetters and completion of the R.R. petrol pump for a 10,000-mile test. | 1st Nov 1931 | Box 65a \ 3 scan0309 | |
| Mechanical failures observed during high-speed test bed running of the Phantom II engine. | 1st Nov 1931 | Box 65a \ 3 scan0310 | |
| Drawing illustrating a crack in a cylinder head near the valve seats. | 2nd Nov 1936 | Box 65a \ 3 scan0311 | |
| Performance improvements for the Continental Phantom II by modifying the air silencer to increase top speed. | 13th Nov 1931 | Box 65a \ 3 scan0312 | |
| Urging the completion of drawings for new features on the 89th Chassis 'N2' Series due to extreme urgency. | 10th Mar 1932 | Box 65a \ 3 scan0313 | |
| Prioritisation of experimental work on 19-EX over P.II's due to reduced sales. | 17th Mar 1932 | Box 65a \ 3 scan0314 | |
| Ongoing experimental work on pedals, wheel carriers, synchro-mesh gearboxes, and slipper wheels for various car models. | 18th Mar 1932 | Box 65a \ 3 scan0315 | |
| Progress report on the development of steering, brake drums, petrol pumps, and frame construction. | 18th Mar 1932 | Box 65a \ 3 scan0316 | |
| Sending drawings for the Phantom II, specifically for an 'Anti' Shimmy shackle and dampers. | 2nd Apr 1932 | Box 65a \ 3 scan0317 | |
| Test report and specification for the 19-EX car following trials at Brooklands. | 22th Apr 1932 | Box 65a \ 3 scan0318 | |
| List of specifications and modifications for various chassis, engine, and electrical components. | 22th Apr 1932 | Box 65a \ 3 scan0319 | |
| Testing of permanent D.W.S. jacks on car 19-EX for potential standardisation. | 22th Apr 1932 | Box 65a \ 3 scan0320 | |
| Modifications and improvements made to the 19-EX test car following an incomplete 10,000-mile test. | 22th Jun 1932 | Box 65a \ 3 scan0321 | |
| Continued report on modifications to exhaust valves, sparking plugs, and a silencer for a test vehicle. | 22th Jun 1932 | Box 65a \ 3 scan0322 | |
| Tabulated list comparing valve specifications for various engines, including Rolls-Royce and Bentley models. | 24th Jun 1932 | Box 65a \ 3 scan0323 | |
| Providing feedback on two cars, 19-EX and J.3, concerning clutch, intake roar, shock dampers, and suspension. | 24th Jun 1932 | Box 65a \ 3 scan0324 | |
| Typed letter detailing travel and road test plans for car 19-EX in France. | 22th Jul 1932 | Box 65a \ 3 scan0325 | |
| Production of synchro-mesh gearboxes and shimmy shackles for the Phantom II model. | 28th Jul 1932 | Box 65a \ 3 scan0326 | |
| Carburetter, camshaft and silencer specifications for Phantom II production models. | 1st Sep 1932 | Box 65a \ 3 scan0327 | |
| Secret memo discussing the future design of the 40/50 HP car. | 2nd Sep 1932 | Box 65a \ 3 scan0328 | |
| Standardisation of components for the Continental model, including the Phantom II carburetter, camshaft, and exhaust system. | 14th Sep 1932 | Box 65a \ 3 scan0329 | |
| Increased proportion of front braking and a steering anti-friction device. | 14th Sep 1932 | Box 65a \ 3 scan0330 | |
| Discussion document outlining proposed improvements for the Phantom model. | 6th Oct 1932 | Box 65a \ 3 scan0331 | |
| List of proposed improvements for the Phantom car, focusing on the engine and brakes. | 6th Oct 1932 | Box 65a \ 3 scan0332 | |
| List of proposed improvements and new features for various vehicle systems and components. | 6th Oct 1932 | Box 65a \ 3 scan0333 | |
| List of suggested improvements for vehicle jacking, cooling, gearbox, and electrical systems. | 6th Oct 1932 | Box 65a \ 3 scan0334 | |
| Possible improvements for the Phantom II vehicle, focusing on performance and engine characteristics. | 6th Oct 1932 | Box 65a \ 3 scan0335 | |
| Standardisation of the Wilson epicyclic gearbox and its potential suitability for production and use. | 6th Oct 1932 | Box 65a \ 3 scan0336 | |
| Questionnaire and responses concerning potential engine and gearbox improvements. | 6th Oct 1932 | Box 65a \ 3 scan0337 | |
| Question and answer document discussing design choices for the rear axle, propeller shaft, exhaust, and petrol systems. | 6th Oct 1932 | Box 65a \ 3 scan0338 | |
| Question and answer document discussing improvements to vehicle systems such as fuel supply, steering, and brakes. | 6th Oct 1932 | Box 65a \ 3 scan0339 | |
| Question and answer document discussing potential improvements to braking and suspension systems. | 6th Oct 1932 | Box 65a \ 3 scan0340 | |
| List of four firms that have recently adopted a specific form of springing. | 6th Oct 1932 | Box 65a \ 3 scan0341 | |
| Questionnaire and list of suggested improvements for car models, focusing on performance, noise, and design. | 6th Oct 1932 | Box 65a \ 3 scan0342 | |
| Questionnaire on potential vehicle improvements, including passenger comfort, electrical systems, and jacking mechanisms. | 21th Oct 1932 | Box 65a \ 3 scan0343 | |
| From Sg. to Hs. regarding the completion and review of questionnaires A and C. | 21th Oct 1932 | Box 65a \ 3 scan0344 | |
| Questionnaire regarding possible improvements for the Phantom II car, focusing on performance and engine characteristics. | 12th Sep 1927 | Box 65a \ 3 scan0345 | |
| Questionnaire page seeking feedback on the throttle governor, clutch, and potential improvements to the gearbox and synchromesh system. | 12th Sep 1927 | Box 65a \ 3 scan0346 | |
| Questionnaire page about gear ratios and rear axle design, including torque tube vs. Hotchkiss drive. | 12th Sep 1927 | Box 65a \ 3 scan0347 | |
| List of discussion points and questions regarding vehicle exhaust and petrol systems. | 12th Sep 1927 | Box 65a \ 3 scan0348 | |
| Checklist page for vehicle systems, covering petrol tank components, steering characteristics, and brake noise. | 12th Sep 1927 | Box 65a \ 3 scan0349 | |
| List of points for evaluating vehicle braking and suspension systems, numbered as page 7. | 12th Sep 1927 | Box 65a \ 3 scan0350 | |
| Questionnaire concerning the performance of shock dampers, suspension systems, and engine cooling components. | 12th Sep 1927 | Box 65a \ 3 scan0351 | |
| Checklist for evaluating sources of car discomfort and issues with chassis lubrication. | 12th Sep 1927 | Box 65a \ 3 scan0352 | |
| List of discussion points regarding the electrical system. | 12th Sep 1927 | Box 65a \ 3 scan0353 | |
| Questionnaire seeking feedback on car features, noise, and comfort improvements. | 16th Nov 1932 | Box 65a \ 3 scan0354 | |
| Modifications for the 'O' Series 40/50 HP Chassis and outlining standard differences for the Continental car. | 16th Nov 1932 | Box 65a \ 3 scan0355 | |
| Improvements and test results for the Phantom II car, leading to an updated production model. | 23th Nov 1932 | Box 65a \ 3 scan0356 | |
| Potential improvements for car models, focusing on power, gearbox, and suspension. | 23th Nov 1932 | Box 65a \ 3 scan0357 | |
| Ongoing tests and proposed improvements for brakes, steering, silencers, and radiators for the Phantom II car. | 23th Nov 1932 | Box 65a \ 3 scan0358 | |
| Modification for the E.A.C. 2 engine involving floating piston pins with aluminium plugs. | 18th Jul 1924 | Box 66 \ 1 scan0001 | |
| Floating piston pins with spherical ends for E.A.C.11 and Goshawk 11 pistons. | 18th Jul 1924 | Box 66 \ 1 scan0002 | |
| Secret memo discussing modifications to pistons, connecting rods, induction pipes and magnetos. | 17th Jul 1924 | Box 66 \ 1 scan0003 | |
| Secret memorandum regarding modifications to pistons and connecting rods for the 46-PK engine. | 12th Jul 1924 | Box 66 \ 1 scan0004 | |
| Engine modifications using longer connecting rods and shorter pistons. | 3rd Jun 1924 | Box 66 \ 1 scan0005 | |
| The modification of car 93-NK with new EAC.11 components at the request of the sales department. | 27th Oct 1924 | Box 66 \ 1 scan0006 | |
| The expected performance and final approval process for production car EAC.11. | 1st Mar 1925 | Box 66 \ 1 scan0007 | |
| Design and effectiveness of different types of piston rings for oil scraping. | 1st Mar 1925 | Box 66 \ 1 scan0008 | |
| Secret memorandum regarding revised floating piston pins with spherical ends for E.A.C. & 20 HP engines. | 3rd Mar 1925 | Box 66 \ 1 scan0009 | |
| Piston failure during 'V' Series tests in France. | 25th Sep 1924 | Box 66 \ 1 scan0010 | |
| Piston failure in car 98-NK during 'V' series tests in France. | 7th Mar 1925 | Box 66 \ 1 scan0011 | |
| Secret memo regarding modifications to E.A.C. pistons, concerning gudgeon pin fit and design to prevent breakage. | 9th Mar 1925 | Box 66 \ 1 scan0012 | |
| The analysis of a fractured 'EAC' piston. | 9th Mar 1925 | Box 66 \ 1 scan0013 | |
| Diagram showing the cross-section of a fractured piston with area calculations. | 9th Mar 1925 | Box 66 \ 1 scan0014 | |
| Blueprint showing a cross-section of a fractured E.A.C. piston. | 13th Mar 1925 | Box 66 \ 1 scan0015 | |
| Graph of oil consumption curves for an E.A.C. engine, comparing different piston ring configurations. | 13th Mar 1925 | Box 66 \ 1 scan0016 | |
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