| Description | Date | Identifier | |
| Proposing modifications to the 25 HP chassis to make its performance comparable with 1931 American cars. | 19th Feb 1931 | Box 5a \ 1 01-page092 | |
| Potential improvements for the 1932 production model, focusing on engine power, weight, and performance. | 19th Feb 1931 | Box 5a \ 1 01-page093 | |
| Graph plotting piston displacement against finished car weight for various competitor car models. | 15th Mar 1931 | Box 5a \ 1 01-page094 | |
| 20/25 HP car with improved performance, specifically regarding the trial of vehicle GLH-60. | 15th Mar 1931 | Box 5a \ 1 01-page095 | |
| Driving seat and control positions for the 'Japan 3' specification. | 21th Mar 1931 | Box 5a \ 1 01-page096 | |
| Secret memo discussing the general arrangement of the J.3 engine in the chassis and potential modifications. | 21th Mar 1931 | Box 5a \ 1 01-page097 | |
| Engine selection, chassis stiffness, and frame design for a new car model. | 4th Apr 1931 | Box 5a \ 1 01-page098 | |
| Meeting notes on revised specifications for the 'Japan S.' engine, focusing on the integral block/crankcase and cylinder head. | 13th Apr 1931 | Box 5a \ 1 01-page099 | |
| Recommendations for improvements to engine components including water circulation and the crankcase. | 13th Apr 1931 | Box 5a \ 1 01-page100 | |
| Report page detailing modifications to unit drives, oil fittings, and special ball bearings. | 13th Apr 1931 | Box 5a \ 1 01-page101 | |
| Engine development priorities, chassis troubles, and competitor comparisons. | 14th Apr 1931 | Box 5a \ 1 01-page102 | |
| Request to investigate trying a modified cast iron head for the 'JAPAN' engine. | 14th Apr 1931 | Box 5a \ 1 01-page103 | |
| Introduction of new features for the 20/25 chassis model. | 16th Apr 1931 | Box 5a \ 1 01-page104 | |
| Design of radiators and arranging a meeting to finalize the matter. | 16th Apr 1931 | Box 5a \ 1 01-page105 | |
| List of new features for the 18-G-4 model. | 20th Nov 1930 | Box 5a \ 1 01-page106 | |
| Proposals for economy and efficiency in the design of car components for 'Japan III', including wheel carriers, aprons, wings, and lamps. | 17th Apr 1931 | Box 5a \ 1 01-page107 | |
| Design change proposals for various vehicle components. | 10th Apr 1931 | Box 5a \ 1 01-page108 | |
| Future car engine design, focusing on smoothness and comparing 6-cylinder and Vee engine configurations. | 10th Apr 1931 | Box 5a \ 1 01-page109 | |
| Engine and chassis design considerations, comparing various configurations and competitor models. | 10th Apr 1931 | Box 5a \ 1 01-page110 | |
| Engine vibration, bonnet issues, and damper and flywheel design for 6-cylinder engines. | 20th Apr 1933 | Box 5a \ 1 01-page111 | |
| Test report on engine smoothness, noise, and performance at various speeds and with different fittings. | 20th Apr 1933 | Box 5a \ 1 01-page112 | |
| Test report detailing observations on car vibrations, rattles, and performance under various configurations. | 20th Apr 1933 | Box 5a \ 1 01-page113 | |
| Test report detailing engine vibration, booming, and performance with and without balance weights. | 20th Apr 1931 | Box 5a \ 1 01-page114 | |
| Introduction of new features for the 'T' Series and the associated production and supply chain considerations. | 20th Apr 1931 | Box 5a \ 1 01-page115 | |
| List of new sections required to introduce the 'Japan' engine for the 20/25 HP chassis. | 20th Apr 1931 | Box 5a \ 1 01-page116 | |
| Page mentioning an untested exhaust heated induction bend. | 22th Apr 1931 | Box 5a \ 1 01-page117 | |
| Potential improvements to the 20/25' model, including radiator, dashboard, and body modifications. | 22th Apr 1931 | Box 5a \ 1 01-page118 | |
| Secret memorandum discussing the status of drawings for the 'JAPAN 3' project. | 23th Apr 1931 | Box 5a \ 1 01-page119 | |
| Minutes of a conference at Conduit St. to discuss modifications to the 20/25 HP chassis. | 24th Apr 1931 | Box 5a \ 1 01-page120 | |
| Meeting notes discussing sales resistance, performance, and design modifications for the 20/25 HP model. | 24th Apr 1931 | Box 5a \ 1 01-page121 | |
| Meeting notes on agreed points and proposed future modifications for the 20/25 HP model. | 24th Apr 1931 | Box 5a \ 1 01-page122 | |
| Proposed modifications for the 'Japan 1' type 20/25 HP chassis. | 18th Mar 1934 | Box 5a \ 1 01-page123 | |
| Specifications and proposals for engine and vehicle components. | 18th Mar 1934 | Box 5a \ 1 01-page124 | |
| Proposed specifications and modifications for various chassis components. | 29th Apr 1931 | Box 5a \ 1 01-page125 | |
| Letter regarding the despatch of a 20/25 open car model for modification to a 'Japan III' appearance. | 29th Apr 1931 | Box 5a \ 1 01-page126 | |
| List of proposed material changes for the 20/25 HP Chassis, second half of 'T' Series. | 30th Apr 1931 | Box 5a \ 1 01-page127 | |
| Cost-cutting schemes without affecting reliability or quality. | 1st May 1931 | Box 5a \ 1 01-page128 | |
| Bonnet and side wheel carrier changes for the second half of the 20/25 'T' series. | 1st May 1931 | Box 5a \ 1 01-page129 | |
| List of proposed design modifications for the 20/25 HP Chassis 'T' Series. | 7th May 1931 | Box 5a \ 1 01-page130 | |
| Page 2 of a list detailing modifications and specifications for various components. | 17th Jun 1931 | Box 5a \ 1 01-page131 | |
| Necessary improvements for the second half of the 'T' series, focusing on appearance and performance. | 17th Jun 1931 | Box 5a \ 1 01-page132 | |
| Chassis work specifications for 6 cylinder P.2 and J.1 models, detailing present and future plans. | 8th May 1931 | Box 5a \ 1 01-page133 | |
| Gearing adjustments and performance comparisons with Bentley vehicles. | 1st May 1931 | Box 5a \ 1 01-page134 | |
| Component specifications for the 25 HP, second half 'T' series cars, designated 'Japan'. | 8th May 1931 | Box 5a \ 1 01-page135 | |
| Technical report discussing component updates and standards, primarily for a 25 HP model. | 1st May 1931 | Box 5a \ 1 01-page136 | |
| Recommending the production of new experimental 25 HP 'T' Series cars for testing. | 8th May 1931 | Box 5a \ 1 01-page137 | |
| The lengthening of a bonnet, a universal dashboard, and wheel carriers for the 'T' Series. | 11th May 1931 | Box 5a \ 1 01-page138 | |
| Component modifications for the 25 HP - JAPAN 1 model. | 2nd May 1931 | Box 5a \ 1 01-page139 | |
| Technical memorandum discussing issues and proposed changes for the crankchamber, brakes, rear axle, and petrol pump. | 12th May 1931 | Box 5a \ 1 01-page140 | |
| Arranging tests in France for a 25 HP car and a Phantom, and the building of new experimental chassis. | 14th May 1931 | Box 5a \ 1 01-page141 | |
| On the urgent need to finalize specifications for the 'V' Series chassis and conduct testing. | 15th May 1931 | Box 5a \ 1 01-page142 | |
| Specification of alterations for the 25 HP. Series after 'T' car. | 15th May 1931 | Box 5a \ 1 01-page143 | |
| List of special features agreed in a conference for the 20/25 HP chassis, second half of 'T' series. | 15th May 1931 | Box 5a \ 1 01-page144 | |
| List of proposed modifications and outstanding decisions for a chassis series, possibly the 20/25 HP. | 15th May 1931 | Box 5a \ 1 01-page145 | |
| Arrangement of cars and parts for testing in France, including the 'T' Series and a Phantom. | 18th May 1931 | Box 5a \ 1 01-page146 | |
| Specification alterations and a list of desired modifications for a car undergoing tests in France. | 19th May 1931 | Box 5a \ 1 01-page147 | |
| Modifying a wooden model of a 20/25 open car to the 'Japan III' appearance. | 9th May 1931 | Box 5a \ 1 01-page148 | |
| Specification for J.1. model covering the engine, flywheel, gearbox, mounting, and camshaft. | 21th May 1931 | Box 5a \ 1 01-page149 | |
| Notes and timing diagrams for a 'No 1' camshaft trial, including performance expectations and component details. | 21th May 1931 | Box 5a \ 1 01-page150 | |
| Design changes to the petrol pump, radiator, and carburettors. | 1st May 1931 | Box 5a \ 1 01-page151 | |
| Improvements and outstanding issues with the 16-G-4, 25HP engine, including flywheel vibration, balance, and exhaust. | 1st May 1931 | Box 5a \ 1 01-page152 | |
| Design considerations for the 25HP 'Future Japan 1s' model, focusing on carburettor types and engine head machining. | 1st May 1931 | Box 5a \ 1 01-page153 | |
| List of special features to be introduced on the 20/25 HP Chassis for the second half of the 'T' series. | 28th May 1931 | Box 5a \ 1 01-page154 | |
| List of vehicle modifications and specifications, including instructions on ordering parts. | 28th May 1931 | Box 5a \ 1 01-page155 | |
| Completion and issuance status of standardisation sheets for various items. | 28th May 1931 | Box 5a \ 1 01-page156 | |
| 'J.1.' specification, production plans and parts for the 'T' series cars. | 29th May 1931 | Box 5a \ 1 01-page157 | |
| Engine power outputs and the required modifications for P.II, 25 HP, and Phantom engines. | 30th May 1931 | Box 5a \ 1 01-page158 | |
| Results of camshaft testing for the Japan I engine power output. | 29th May 1931 | Box 5a \ 1 01-page159 | |
| Engine performance related to camshaft timing, tappet clearances, silencers, and exhaust drumming issues. | 3rd Jun 1931 | Box 5a \ 1 01-page160 | |
| Timeline and development requirements for the 'Japan 1' specification, a new engine and gearbox. | 3rd Jun 1931 | Box 5a \ 1 01-page161 | |
| The Phantom II Conversion Scheme, discussing car modifications like engine mountings and radiators for testing in France. | 11th Jun 1931 | Box 5a \ 1 01-page162 | |
| Engine design modifications for the Japan Cars, concerning the carburetter, flywheel, and crankchamber. | 1st Mar 1931 | Box 5a \ 1 01-page163 | |
| J.3 engine design, engine size, and the balance between performance and comfort. | 13th Jun 1931 | Box 5a \ 1 01-page164 | |
| Construction of a single-cylinder unit. | 13th Jun 1931 | Box 5a \ 1 01-page165 | |
| Telephone conversation regarding engine design choices, comparing 'Japan 3' and 'Japan 1' models, and considering changes to engine and car sizes. | 13th Jun 1931 | Box 5a \ 1 01-page166 | |
| Engine design specifications for 'JAPAN III' with a 3.4' bore and 5' stroke. | 15th Jun 1931 | Box 5a \ 1 01-page167 | |
| Engine design proposals for Japan I, II, and III chassis, specifically regarding stroke and bore increases. | 17th Jun 1931 | Box 5a \ 1 01-page168 | |
| Secret memo discussing modifications to improve the power output of the 'China' engine. | 23th Jun 1931 | Box 5a \ 1 01-page169 | |
| Vehicle tests conducted at Brooklands, comparing a Buick with company cars. | 24th Jun 1931 | Box 5a \ 1 01-page170 | |
| Objections to building an experimental 20/25 Special Touring Saloon with a dropped radiator. | 1st Jul 1931 | Box 5a \ 1 01-page171 | |
| Design plans for future 6-cylinder engines and synchro mesh transmissions. | 6th Jul 1931 | Box 5a \ 1 01-page172 | |
| Correspondence sending J.3. drawings for alternative dashboard, brake equaliser, and clutch shaft designs. | 6th Jul 1931 | Box 5a \ 1 01-page173 | |
| List of instructed parts for the 25 HP programme, categorized for China and Japan. | 6th Jul 1931 | Box 5a \ 1 01-page174 | |
| Accompanying blueprint Lec.2926 for the revised J.3 engine, detailing its general scheme and construction materials. | 7th Jul 1931 | Box 5a \ 1 01-page175 | |
| Confidential memorandum detailing design proposals for the J.2 25 HP car and Private Venture aero engine. | 1st Jul 1931 | Box 5a \ 1 01-page176 | |
| Specification changes for front springs, carburettors, ignition, petrol supply, and gearing. | 1st Jul 1931 | Box 5a \ 1 01-page177 | |
| Expressing concerns about the design direction and performance of a new 25 HP car. | 1st Jul 1931 | Box 5a \ 1 01-page178 | |
| Engine bore and stroke for the 20/25 model, advocating for a larger bore to increase performance. | 14th Jul 1931 | Box 5a \ 1 01-page179 | |
| List of parts to be fitted to vehicle 19-G4 for testing in France. | 18th Jul 1931 | Box 5a \ 1 01-page180 | |
| Modifications to the radiator and the engine horsepower rating for the 20/50 'T' series. | 17th Jul 1931 | Box 5a \ 1 01-page181 | |
| Radiator alterations and bonnet shutters for the 25 HP car ahead of testing in France. | 18th Jul 1931 | Box 5a \ 1 01-page182 | |
| Preliminary specification document for an 18 HP model. | 1st Jul 1931 | Box 5a \ 1 01-page183 | |
| The trade-offs between using use-less bushes for springs versus retaining the central oiling system. | 23th Jul 1931 | Box 5a \ 1 01-page184 | |
| Specifications for an 18HP model, including track width and gear change position. | 23th Jul 1931 | Box 5a \ 1 01-page185 | |
| Private letter from Sg. to Hives regarding the building of a J.3 experimental car. | 29th Jul 1931 | Box 5a \ 1 01-page186 | |
| Secret memo discussing the construction of a new 20/25 car with a saloon body for testing and as a sample for the 'U' Series. | 29th Jul 1931 | Box 5a \ 1 01-page187 | |
| Component specifications for various vehicle series including gearboxes, axles, and batteries. | 29th Jul 1931 | Box 5a \ 1 01-page188 | |
| Clarifying car specifications for the bonnet, steering column, and springs. | 9th Jul 1931 | Box 5a \ 1 01-page189 | |
| List of engine components, service items, and other parts. | 1st Jul 1931 | Box 5a \ 1 01-page190 | |
| Project status of a new 20/25 design, codenamed 'Japan 3', and the plan to build an experimental chassis. | 1st Jul 1931 | Box 5a \ 1 01-page191 | |
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