| Description | Date | Identifier | |
| Report recommending a design modification to new shock absorbers to prevent mud collection. | 25th Jul 1919 | Box 180 \ M3 \ M3.6 img036 | |
| The fitting of new rear shock absorbers on car 49-GB. | 5th Jun 1919 | Box 180 \ M3 \ M3.6 img037 | |
| Completion date of a new car and proposing to fit large ventilators to cure hot floorboards. | 5th Jun 1919 | Box 180 \ M3 \ M3.6 img038 | |
| Effectiveness and design of radiator shutters and bonnets for the 40/50 chassis. | 5th Jun 1919 | Box 180 \ M3 \ M3.6 img039 | |
| Recommendation for an alteration regarding the engagement of spring clips, continued on page 2. | 1st Jun 1919 | Box 180 \ M3 \ M3.6 img040 | |
| Recommending an aluminium radiator blanking-off piece over a 3-ply wood version for the 40/50 chassis. | 5th Jun 1919 | Box 180 \ M3 \ M3.6 img041 | |
| The mileage of short connecting rods fitted to chassis 49-CB and I.E.X. | 7th Jun 1919 | Box 180 \ M3 \ M3.6 img042 | |
| Hard spots on aluminium pistons for the 40/50 ATW chassis, recommending they be cleared around the gudgeon pin hole. | 21th Jun 1919 | Box 180 \ M3 \ M3.6 img043 | |
| Testing a new water bye-pass pipe for the 40/50 chassis cooling system, including temperature results and a proposed valve design. | 10th Jun 1919 | Box 180 \ M3 \ M3.6 img044 | |
| Radiator temperature control, blanking, and the complexity of a driver-operated valve. | 10th Jun 1919 | Box 180 \ M3 \ M3.6 img045 | |
| The testing of 'Rapid' Jacks from Mr. Lionel Rapson and the subsequent negative recommendation for their use. | 27th Jun 1919 | Box 180 \ M3 \ M3.6 img046 | |
| Report criticising permanently fixed car jacks for their excessive weight, poor locking device, and overall low quality. | 27th Jun 1919 | Box 180 \ M3 \ M3.6 img047 | |
| Continued discussion on car jack designs, comparing operating times and proposing the addition of axle pads. | 27th Jun 1919 | Box 180 \ M3 \ M3.6 img048 | |
| Letter proposing the integration of Rapson Jacks into the chassis for enhanced safety. | 14th Jun 1919 | Box 180 \ M3 \ M3.6 img049 | |
| Page 2 of a letter from F. Lionel Rapson concerning the 'Rapid' Jack Co. and advertising. | 16th Apr 1919 | Box 180 \ M3 \ M3.6 img050 | |
| Specification document detailing the price, weight, and materials for 'Rapson' Jacks. | 16th Apr 1919 | Box 180 \ M3 \ M3.6 img051 | |
| The effects of moving rear springs from below to above the axle to improve road holding. | 27th Jun 1919 | Box 180 \ M3 \ M3.7 img001 | |
| Road testing suspension performance, measuring rear wheel revolutions at various speeds and tyre pressures. | 27th Jun 1919 | Box 180 \ M3 \ M3.7 img002 | |
| The intention to compare rear springs positioned above and below the axle. | 27th Jun 1919 | Box 180 \ M3 \ M3.7 img003 | |
| The trial of a new type of shock absorber and its comparison to the Trauffault model. | 27th Jun 1919 | Box 180 \ M3 \ M3.7 img004 | |
| Hand-drawn sketch of a component's cross-section with dimensional annotations. | 27th Jun 1919 | Box 180 \ M3 \ M3.7 img005 | |
| The expansion and necessary clearances for aluminium and cast iron pistons, including a diagram with measurements. | 27th Jun 1919 | Box 180 \ M3 \ M3.7 img006 | |
| Heat expansion test results for various cast iron and aluminium pistons. | 27th Jun 1919 | Box 180 \ M3 \ M3.7 img007 | |
| Controlling engine water temperature, suggesting a radiator bye-pass scheme to prevent piston knock during city driving. | 22th Jul 1919 | Box 180 \ M3 \ M3.7 img008 | |
| Suggestion to fit primers to pre-electric starting cars to assist with hand-starting on the 40/50 Chassis. | 22th Jul 1919 | Box 180 \ M3 \ M3.7 img009 | |
| Dynamo drive belt slippage and noise produced by different dynamo models. | 1st Aug 1919 | Box 180 \ M3 \ M3.7 img010 | |
| Modifications to Lucas dynamos to reduce noise and address ball bearing failures. | 1st Aug 1919 | Box 180 \ M3 \ M3.7 img011 | |
| Diagnosing and fixing engine knocking and pre-ignition issues in car 7-CA. | 12th Aug 1919 | Box 180 \ M3 \ M3.7 img012 | |
| Engine knocking caused by tight pistons and pre-ignition from incorrect sparking plugs. | 12th Aug 1919 | Box 180 \ M3 \ M3.7 img013 | |
| The 40/50 chassis bumping test, detailing the rig setup, modifications, and comparison to pre-war tests. | 18th Aug 1919 | Box 180 \ M3 \ M3.7 img014 | |
| Engine knocking issues with aluminium pistons on standard cars. | 18th Aug 1919 | Box 180 \ M3 \ M3.7 img015 | |
| Piston knock standards, clearances, and the risk of seizure for different piston materials. | 22th Aug 1919 | Box 180 \ M3 \ M3.7 img016 | |
| Piston knock issues with aluminium pistons, design alterations, and the proposed customer communication strategy. | 19th Nov 1924 | Box 180 \ M3 \ M3.7 img017 | |
| Curing piston knocks and the consequences of fitting certain pistons to meet the limits set by the Sales Department. | 11th Apr 1925 | Box 180 \ M3 \ M3.7 img018 | |
| The method to reduce piston knocks in a cold engine using late ignition. | 25th Aug 1919 | Box 180 \ M3 \ M3.7 img019 | |
| Report recommending modifications to the improved clutch brake design for the 40/50 chassis. | 26th Aug 1919 | Box 180 \ M3 \ M3.7 img020 | |
| The design of standard oil pumps, noting the 20° obliquity gears and absence of noise complaints. | 29th Aug 1919 | Box 180 \ M3 \ M3.7 img021 | |
| Test note regarding the performance of standard brakes holding a car on a gradient. | 3rd Nov 1911 | Box 180 \ M4 \ M4.1 img001 | |
| For the Technical Committee regarding shortening rear brake liners to prevent them from catching. | 6th Dec 1911 | Box 180 \ M4 \ M4.1 img002 | |
| Note querying if extra rivets could be fitted to a metal component. | 26th Jan 1921 | Box 180 \ M4 \ M4.1 img003 | |
| Comparing the steering system of a 'Marmon' car with the company's own system. | 26th Jan 1921 | Box 180 \ M4 \ M4.1 img004 | |
| Steering perfection through the use of vertical pins, tyre balance, and vehicle stability. | 24th Jan 1921 | Box 180 \ M4 \ M4.1 img005 | |
| Report comparing the engine performance, gear ratios, and fuel consumption of a Marmon car to the standard 40/50 chassis. | 2nd Feb 1921 | Box 180 \ M4 \ M4.1 img006 | |
| Performance and specification data for a Marion Car. | 16th Dec 1920 | Box 180 \ M4 \ M4.1 img007 | |
| Test report detailing vehicle performance characteristics including braking, engine timing, and suspension. | 16th Dec 1920 | Box 180 \ M4 \ M4.1 img008 | |
| Specifications for turning circle, transmission, inlet valve, springs, and chassis details. | 4th Apr 1922 | Box 180 \ M4 \ M4.1 img009 | |
| Recommendation to perform a dynamometer curve test on an Essex car before it is disposed of. | 4th Apr 1922 | Box 180 \ M4 \ M4.1 img010 | |
| Performance and specification report for an Essex Car. | 19th Jan 1921 | Box 180 \ M4 \ M4.1 img011 | |
| Technical specifications and test results for an Essex Car. | 19th Jul 1917 | Box 180 \ M4 \ M4.1 img012 | |
| List of specifications for the Essex Car, with a sketch of the brake lever and quadrant. | 4th Jan 1921 | Box 180 \ M4 \ M4.1 img013 | |
| Comparison of American cars with the Napier regarding driving experience, comfort, and gear lever design. | 10th Feb 1921 | Box 180 \ M4 \ M4.1 img014 | |
| Specification and performance data sheet for a Humber Car 15.9 Horse Power. | 12th Mar 1921 | Box 180 \ M4 \ M4.1 img015 | |
| Performance test report detailing vehicle clutch, brakes, engine, and suspension specifications. | 10th Dec 1907 | Box 180 \ M4 \ M4.1 img016 | |
| Continued analysis and critique of a Humber Car's components and design. | 16th Dec 1920 | Box 180 \ M4 \ M4.1 img017 | |
| Humber Car valve contours, detailing lift measurements at various degrees for inlet and exhaust cams. | 10th Dec 1930 | Box 180 \ M4 \ M4.1 img018 | |
| Hill climb performance data for a Humber Car loaded with the equivalent of four passengers. | 17th Mar 1921 | Box 180 \ M4 \ M4.1 img019 | |
| Starter gear failure in a Marmon car, comparing its torsional spring drive with other Bendix pinion systems. | 17th Mar 1921 | Box 180 \ M4 \ M4.1 img020 | |
| Sending a blueprint for the Goshawk 11 Dumb Iron, which has been made 30% longer. | 11th Apr 1922 | Box 180 \ M4 \ M4.1 img021 | |
| Advising of four American cars for sale and requesting their cost price. | 14th Jan 1921 | Box 180 \ M4 \ M4.1 img022 | |
| Sale and valuation of several American cars, highlighting depreciation due to their left-hand drive configuration. | 24th May 1921 | Box 180 \ M4 \ M4.1 img023 | |
| Prices and condition of second-hand American cars for sale. | 26th Jan 1921 | Box 180 \ M4 \ M4.1 img024 | |
| Letter from International Distributors Ltd. regarding a scale drawing of a 7-passenger limousine. | 30th Oct 1935 | Box 180 \ M4 \ M4.1 img025 | |
| Letter discussing the Hupmobile car and declining a request to exchange rides with a Phantom III due to high demand. | 11th Nov 1935 | Box 180 \ M4 \ M4.1 img026 | |
| The particulars of a 'Buick' car. | 5th May 1919 | Box 180 \ M4 \ M4.1 img027 | |
| Engine horsepower, valve timing, and valve contour data tables. | 1st May 1919 | Box 180 \ M4 \ M4.1 img028 | |
| Short test runs of competitor cars from the Olympia Show, including Hispano-Suiza, Napier, Lanchester, and Packard. | 11th Nov 1920 | Box 180 \ M4 \ M4.1 img029 | |
| Continued road test report comparing a Lanchester car to other vehicles. | 11th Nov 1920 | Box 180 \ M4 \ M4.1 img030 | |
| Performance and handling comparison of a Packard vehicle, noting issues with brakes, gears, steering, and starting. | 11th Nov 1920 | Box 180 \ M4 \ M4.1 img031 | |
| The performance data of a Hispano servo. | 1st Mar 1924 | Box 180 \ M4 \ M4.1 img032 | |
| The performance and efficiency of a servo mechanism. | 1st Mar 1924 | Box 180 \ M4 \ M4.1 img033 | |
| Hispano car, detailing clutch performance, engine issues with seized pistons, and a correction on a steering measurement. | 16th Jan 1924 | Box 180 \ M4 \ M4.1 img034 | |
| Steering specifications for a Hispano model. | 1st Feb 1924 | Box 180 \ M4 \ M4.1 img035 | |
| The particulars and rating of Hispano front springs. | 1st Mar 1924 | Box 180 \ M4 \ M4.1 img036 | |
| Obtaining data from a Hispano engine. | 11th Mar 1924 | Box 180 \ M4 \ M4.1 img037 | |
| Comparing the specifications and power output of Hispano and E.A.C. engines. | 11th Mar 1924 | Box 180 \ M4 \ M4.1 img038 | |
| Distribution, valve temperature, and the effects of dual ignition on a Hispano engine. | 11th Mar 1924 | Box 180 \ M4 \ M4.1 img039 | |
| Indicator work and performance tests carried out on a Hispano engine. | 12th Jul 1923 | Box 180 \ M4 \ M4.1 img040 | |
| Report page discussing the performance of an indicator valve regarding detonation and efficiency. | 12th Jul 1923 | Box 180 \ M4 \ M4.1 img041 | |
| Hispano indicator diagrams taken at 1500 and 2500 RPM. | 12th Jul 1923 | Box 180 \ M4 \ M4.1 img042 | |
| Diagram of the Hispano clutch operating mechanism and associated force calculations. | 7th Feb 1924 | Box 180 \ M4 \ M4.2 img001 | |
| Calculations and diagrams for the Goshawk clutch mechanism with M1 plug. | 7th Feb 1924 | Box 180 \ M4 \ M4.2 img002 | |
| Technical drawing showing different views and dimensions of an axle pivot. | 7th Feb 1924 | Box 180 \ M4 \ M4.2 img003 | |
| Drawing showing three views of a cylinder block. | 7th Feb 1924 | Box 180 \ M4 \ M4.2 img004 | |
| Technical drawing of the arrangement of a clutch, including a top-half sectional view. | 7th Feb 1924 | Box 180 \ M4 \ M4.2 img005 | |
| Diagram showing the distance between the centre of the tyre and the centre of the pivot pin when in contact with the road. | 7th Feb 1924 | Box 180 \ M4 \ M4.2 img006 | |
| Schematic diagram of Hispano Suiza steering details and components. | 7th Feb 1924 | Box 180 \ M4 \ M4.2 img007 | |
| Performance graph of a Hispano engine, plotting pressure against crank angles. | 25th Feb 1923 | Box 180 \ M4 \ M4.2 img008 | |
| Graph of piston displacement for crank angles with performance data from a Hispano engine test. | 25th Feb 1923 | Box 180 \ M4 \ M4.2 img009 | |
| Performance curves for a Hispano engine, showing cooling water flow versus induction pipe depression. | 25th Feb 1923 | Box 180 \ M4 \ M4.2 img010 | |
| Graph comparing the specific output (BHP/Litre) versus RPM for E.A.C. and Hispano engine configurations. | 25th Feb 1923 | Box 180 \ M4 \ M4.2 img011 | |
| Graph comparing B.M.E.P. against conventional gas velocity for Hispano and E.A.C. past valves. | 25th Feb 1923 | Box 180 \ M4 \ M4.2 img012 | |
| Graph comparing ignition advance against engine RPM for E.A.C. and Hispano engines, detailing detonation and the effect of dual ignition. | 25th Feb 1923 | Box 180 \ M4 \ M4.2 img013 | |
| Graph plotting inlet valve displacement against piston displacement, comparing 'Hispano' and 'E.A.C.' curves. | 25th Feb 1923 | Box 180 \ M4 \ M4.2 img014 | |
| Graph comparing E.A.C. & Hispano inlet valve lift diagrams. | 25th Feb 1923 | Box 180 \ M4 \ M4.2 img015 | |
| Performance graph comparing Horsepower (HP) and Mean Effective Pressure (M.E.P.) curves for Hispano and E.A.C. engines. | 25th Feb 1923 | Box 180 \ M4 \ M4.2 img016 | |
| Performance graph showing B.HP, B.M.E.P., thermal efficiency, and consumption against R.P.M., including a valve timing diagram. | 25th Feb 1923 | Box 180 \ M4 \ M4.2 img017 | |
| Wiring diagram for the connections of a Lucas dynamo and vehicle lamps. | 25th Feb 1923 | Box 180 \ M4 \ M4.2 img018 | |
| Wiring diagram for a Lucas Dynamo Lighting Set. | 25th Feb 1923 | Box 180 \ M4 \ M4.2 img019 | |
| Blueprint showing the design and dimensions of a connecting rod. | 25th Feb 1923 | Box 180 \ M4 \ M4.2 img020 | |
| Blueprint of a clutch assembly with multiple views and dimensions. | 25th Feb 1923 | Box 180 \ M4 \ M4.2 img021 | |
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