| Description | Date | Identifier | |
| Alternative policy for carburettors and induction pipes. | 21th Jun 1928 | Box 56 \ 2 Scan151 | |
| On mixture distribution issues in SS and G4 induction pipes, proposing steam heating and hydraulic testing. | 12th Nov 1928 | Box 56 \ 2 Scan152 | |
| Standardisation proposal to replace the cast iron induction pipe with an aluminium version to improve reliability. | 5th Apr 1927 | Box 56 \ 2 Scan153 | |
| Standardisation document for chassis parts for the 'L' series, detailing the test date, cost of tools, and nil cost for scrapped material. | 8th Oct 1927 | Box 56 \ 2 Scan154 | |
| Design change for the cylinder block water pipe connection on the India 3 project. | 13th Jul 1928 | Box 56 \ 2 Scan155 | |
| Drawing Lec.2571 for an induction pipe for the 'India 3' project, and its adaptation for various carburettors. | 4th Jul 1928 | Box 56 \ 2 Scan156 | |
| Sending drawing LeC. 2622, detailing alternative induction pipes to fix distribution troubles. | 13th Dec 1928 | Box 56 \ 2 Scan157 | |
| Abandoning exhaust heating for an induction system and the implications for engine performance. | 1st Feb 1929 | Box 56 \ 2 Scan158 | |
| Design and testing of a new induction pipe to trial a single carburetter system for the 'Japan' project. | 29th Nov 1929 | Box 56 \ 2 Scan159 | |
| Tests comparing a single carburetter with a twin ramming pipe against a twin carburetter setup on a 'Japan' engine. | 23th Dec 1929 | Box 56 \ 2 Scan160 | |
| Report comparing the performance of single versus twin carburettor systems on the Phantom model. | 24th Dec 1929 | Box 56 \ 2 Scan161 | |
| Graph comparing engine performance with different induction pipe and carburetor setups for a VG-8 engine. | 24th Dec 1929 | Box 56 \ 2 Scan162 | |
| Blueprint showing three different induction pipe designs and dimensions for carburettor tests on a 'Japan' engine. | 28th Dec 1929 | Box 56 \ 2 Scan163 | |
| Twin carburetter tests and camshaft comparisons performed on the 'Japan' engine. | 23th May 1930 | Box 56 \ 2 Scan164 | |
| Tests on engine induction systems, including riser pipes, bore sizes, and chokes. | 23th May 1930 | Box 56 \ 2 Scan165 | |
| Report comparing engine performance with different camshaft durations and carburetter configurations. | 23th May 1930 | Box 56 \ 2 Scan166 | |
| Summary of experiments on the 'Japan' engine concerning carburetter and camshaft performance. | 23th May 1930 | Box 56 \ 2 Scan167 | |
| Blueprint showing actual valve timing data from twin carburetor tests on a 'Japan' engine with .020 tappet clearance. | 21th May 1930 | Box 56 \ 2 Scan168 | |
| Performance graph comparing large and small bore induction manifolds on a 'Japan' engine with twin Zenith carburettors. | 21th May 1930 | Box 56 \ 2 Scan169 | |
| Performance graph comparing different camshafts on a 'Japan' engine model, plotting Brake Horse Power and Brake Mean Effective Pressure against RPM. | 21th May 1930 | Box 56 \ 2 Scan170 | |
| Performance graph comparing a Twin Zenith carburetter against a standard chassis carburetter on the 'Japan' engine configuration. | 22th May 1930 | Box 56 \ 2 Scan171 | |
| Arrangement of a Twin Zenith carburettor and induction pipe on a Japan engine. | 22th May 1930 | Box 56 \ 2 Scan172 | |
| Proposed modification to the 25HP induction stand pipe (E.51083) to improve starting by cutting off the pilot pipe. | 6th Jan 1931 | Box 56 \ 2 Scan173 | |
| Preliminary arrangement for the Japan 3 induction system. | 5th Mar 1931 | Box 56 \ 2 Scan174 | |
| Request to manufacture a 25 HP induction pipe for a Zenith 35 D.U.P. carburetter. | 16th May 1931 | Box 56 \ 2 Scan175 | |
| Modifications to a carburetter and induction pipe for a 16.G.IV model, and checking availability for an 18.G.IV. | 22th Jun 1931 | Box 56 \ 2 Scan176 | |
| Requesting the manufacture of a modified induction pipe fishtail and packing piece for a specific engine. | 23th Jun 1931 | Box 56 \ 2 Scan177 | |
| Drawings for an induction system intended for testing 25HP single carburetters. | 12th Sep 1931 | Box 56 \ 2 Scan178 | |
| Requesting an alteration to the Japan induction pipe. | 27th Oct 1931 | Box 56 \ 2 Scan179 | |
| Record of a telephone conversation regarding modifications to the oil flow, sump connections, and induction system. | 28th Oct 1931 | Box 56 \ 2 Scan180 | |
| Single carburetter scheme and the required exhaust connection modifications. | 28th Oct 1931 | Box 56 \ 2 Scan181 | |
| Design of J.3 induction pipes and carburetter systems. | 30th Nov 1931 | Box 56 \ 2 Scan182 | |
| Requesting a drawing for a new induction pipe for the J.1 project, detailing requirements for carburetter silencers and air intake. | 10th Oct 1932 | Box 56 \ 2 Scan183 | |
| Requesting the issue of details for Induction Pipe LeC.3098 to enable patterns to be put in hand. | 7th Nov 1932 | Box 56 \ 2 Scan184 | |
| Preliminary arrangement of a J.l. Induction Pipe. | 12th Nov 1932 | Box 56 \ 2 Scan185 | |
| Dispatch of an Induction Pipe for a J.1. Engine. | 24th Nov 1932 | Box 56 \ 2 Scan186 | |
| Instructing a 4-port induction pipe for testing on a 20-HP head for the Spectre model. | 19th Sep 1933 | Box 56 \ 2 Scan187 | |
| Request to manufacture parts for experiments on a 20/25 HP induction pipe. | 5th Jan 1934 | Box 56 \ 2 Scan188 | |
| Request to produce two new cylinder blocks for the 20/25 induction system with an increased oval gas passage. | 7th Jun 1934 | Box 56 \ 2 Scan189 | |
| The desirable proportions for sports type road springs on the 20 HP car. | 27th Jan 1931 | Box 56 \ 3 Scan001 | |
| Order for three 20/25 HP Continental Touring Saloon chassis and the testing of springs. | 26th Jan 1931 | Box 56 \ 3 Scan002 | |
| Chassis modifications and features for the proposed Continental Touring 20/25 model. | 27th Jan 1931 | Box 56 \ 3 Scan003 | |
| Bodywork modifications including spare wheels and bonnet alterations for the 'Japan 3' project. | 28th Jan 1931 | Box 56 \ 3 Scan004 | |
| Chassis, springs, and shock absorbers for a 20/25 HP Continental Touring Saloon. | 28th Jan 1931 | Box 56 \ 3 Scan005 | |
| Proposed rear road springs to lower the Continental Touring 20/25 HP chassis. | 28th Jan 1931 | Box 56 \ 3 Scan006 | |
| Proposal for road spring settings for a Continental Touring 25 HP vehicle. | 30th Jan 1931 | Box 56 \ 3 Scan007 | |
| Naming and potential fitting of a cut-out for the 20/25 HP Special Touring Saloon. | 29th Jan 1931 | Box 56 \ 3 Scan008 | |
| Naming of the 20/25 HP Special Touring Saloon and its exhaust cutout feature. | 2nd Feb 1931 | Box 56 \ 3 Scan009 | |
| Proposal for road spring specifications for a Special Touring 25 HP car. | 2nd Feb 1931 | Box 56 \ 3 Scan010 | |
| Design, weight specifications, and aesthetic details for a special touring saloon body. | 4th Feb 1931 | Box 56 \ 3 Scan011 | |
| Design prints for a Special Touring Saloon body on the 20/25 chassis. | 10th Feb 1931 | Box 56 \ 3 Scan012 | |
| Objections to building a 20/25 Special Touring Saloon demonstration car with a dropped radiator. | 1st Jul 1931 | Box 56 \ 3 Scan013 | |
| Developing an improved performance 'China' unit for a 25 HP car by increasing the valve lift. | 6th Jul 1931 | Box 56 \ 3 Scan014 | |
| Designs for a Special Touring Saloon body on a 25 HP chassis. | 22th Aug 1931 | Box 56 \ 3 Scan015 | |
| Special features and modifications for a 'U' Series chassis for a Special Touring Saloon. | 22th Aug 1931 | Box 56 \ 3 Scan016 | |
| Request for a blueprint of a 25HP louvered bonnet to modify the scuttle louvres on a Special Touring Saloon. | 22th Aug 1931 | Box 56 \ 3 Scan017 | |
| Chassis modification for the cross member dimension on a 'U' Series Continental Touring Saloon. | 26th Aug 1931 | Box 56 \ 3 Scan018 | |
| Design of a new 'U' series petrol tank to improve appearance and reduce cost. | 29th Aug 1931 | Box 56 \ 3 Scan019 | |
| Fitting of exhaust cutouts and a suitable gearbox design for the 25 HP 'U' Series Special Touring Saloon. | 1st Sep 1931 | Box 56 \ 3 Scan020 | |
| Fitting a louvred bonnet and scuttle to the 25HP 'U' Series Special Touring Saloon. | 2nd Sep 1931 | Box 56 \ 3 Scan021 | |
| Confirming the specification for a louvred bonnet on the 20/25 HP 'U' Series Special Touring Saloon. | 7th Sep 1931 | Box 56 \ 3 Scan022 | |
| Experimental instructions and specifications for a new 20/25 Chassis 'U' Series car, model 20-G-IV. | 14th Sep 1931 | Box 56 \ 3 Scan023 | |
| List of specifications for a vehicle's bonnet, gearbox, frame, and other fittings. | 28th Jan 1931 | Box 56 \ 3 Scan024 | |
| List of notes and instructions regarding specific vehicle component modifications and designs. | 15th Sep 1931 | Box 56 \ 3 Scan025 | |
| Confirming chassis modifications and exhaust system for a Special Touring Saloon 'U' Series. | 15th Sep 1931 | Box 56 \ 3 Scan026 | |
| The production of a 25HP special touring saloon body, requesting blueprints and tracings for coachbuilders. | 19th Nov 1931 | Box 56 \ 3 Scan027 | |
| Arrangements for a Special Touring Saloon 20.G.4. to be photographed. | 12th Dec 1931 | Box 56 \ 3 Scan028 | |
| Test drive of the Special Touring Saloon (20-G-4), comparing its performance and gearbox noise to other models. | 17th Dec 1931 | Box 56 \ 3 Scan029 | |
| Issues identified during a test ride of a car, including a roaring sunshine roof, incorrect lever positions, and a dangerous mirror. | 18th Dec 1931 | Box 56 \ 3 Scan030 | |
| Discussion comparing the cost of a proprietary design versus a Dunlop alternative, mentioning a spigot, dummy hub, and gate. | 18th Dec 1931 | Box 56 \ 3 Scan031 | |
| The gear and brake lever positions on the 20.G.IV model. | 18th Dec 1931 | Box 56 \ 3 Scan032 | |
| Potential improvements to the 25 HP engine's power output for the 20-G-4 model. | 22th Dec 1931 | Box 56 \ 3 Scan033 | |
| Performance analysis detailing brake horsepower increases at various speeds and comparing results to Brooklands lap data. | 22th Dec 1931 | Box 56 \ 3 Scan034 | |
| Graph comparing engine performance with standard, 50% larger, and 100% larger chokes. | 22th Dec 1931 | Box 56 \ 3 Scan035 | |
| Review of the 25 HP model's position, with proposals for future developments and performance improvements for a 'Continental' version. | 28th Dec 1931 | Box 56 \ 3 Scan036 | |
| Special brake lever, spare wheel carrier, Dunlop dummy hub, and rear number plate brackets for the 20/25 HP chassis. | 28th Dec 1931 | Box 56 \ 3 Scan037 | |
| Internal memorandum discussing the potential introduction of a Sports 25 HP model and its market positioning. | 18th Jan 1932 | Box 56 \ 3 Scan038 | |
| Road test results for the Continental 25 HP car, comparing performance with different engine heads, carburetors, and chokes. | 22th Jan 1932 | Box 56 \ 3 Scan039 | |
| Continuation memo on adapting a J.1 cylinder head for a Continental 25 HP car engine. | 22th Jan 1932 | Box 56 \ 3 Scan040 | |
| Comparison of power curves for a proposed Continental 25 HP engine with an open exhaust. | 29th Feb 1932 | Box 56 \ 3 Scan041 | |
| Potential engine performance trials for the Continental Phantom and 25HP models. | 29th Feb 1932 | Box 56 \ 3 Scan042 | |
| Advance information memo regarding the 20 HP wheelcase gearing diagram LeC.1080. | 5th May 1919 | Box 56 \ 3 Scan043 | |
| Design instructions for the 20 HP wheelcase and gears, focusing on the magneto drive and fabric couplings. | 19th May 1919 | Box 56 \ 3 Scan044 | |
| Instruction to proceed with detail work, noting that certain components like water pump connections and fan drive will be sent later. | 19th May 1919 | Box 56 \ 3 Scan045 | |
| Request to extend the 20 HP chassis wheelbase from 118 to 120 inches. | 16th Jun 1919 | Box 56 \ 3 Scan046 | |
| Revised, simpler design for the 20 HP engine's oil pump drive. | 27th Aug 1919 | Box 56 \ 3 Scan047 | |
| Revisions to the 20 HP wheelcase, including changes to the camshaft drive and bearings. | 26th Sep 1919 | Box 56 \ 3 Scan048 | |
| Print of a Wheelcase for the 20 HP Chassis. | 1st Oct 1919 | Box 56 \ 3 Scan049 | |
| Confirming the dispatch of duplicate blueprints for the 'Goshawk' Wheelcase & Fittings section. | 3rd Aug 1920 | Box 56 \ 3 Scan050 | |
| Parts fitted to a 'Goshawk' engine for testing. | 20th Sep 1920 | Box 56 \ 3 Scan051 | |
| Extract regarding gear hum from the Goshawk engine and a method to cure it using a fine cutting powder. | 28th Sep 1920 | Box 56 \ 3 Scan052 | |
| Accompanying a blueprint for the revised 20 HP wheelcase and gears, noting that some design elements are still undecided. | 27th Nov 1920 | Box 56 \ 3 Scan053 | |
| The revised Goshawk wheelcase and gears, and the dispatch of related drawings. | 8th Dec 1920 | Box 56 \ 3 Scan054 | |
| Sending two blueprints for a 'Kits' chassis, covering the Spring Drive and Wheelcase. | 15th Dec 1920 | Box 56 \ 3 Scan055 | |
| Temporarily using 14½° obliquity gears instead of the specified 20° for an experimental chassis. | 24th Dec 1920 | Box 56 \ 3 Scan056 | |
| Extract discussing a revised lubrication method for future engine wheelcase gears to prevent noise. | 8th Oct 1921 | Box 56 \ 3 Scan057 | |
| Engine undershield and half-time wheelcase for the Goshawk 11. | 12th Oct 1921 | Box 56 \ 3 Scan058 | |
| Modifications to the Goshawk 11 wheelcase, gear, and fan. | 13th Oct 1921 | Box 56 \ 3 Scan059 | |
| Alterations for a larger fan, radiator, cowling and fan pulley as per Mr. Royce's instructions. | 13th Oct 1921 | Box 56 \ 3 Scan060 | |
| Design changes, positioning, and lubrication for an adjustable carrier wheel. | 31th Mar 1928 | Box 56 \ 3 Scan061 | |
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