| Description | Date | Identifier | |
| Need to advise on the importance of 40-lbs front tyre pressure and the suspension's influence on steering. | 30th May 1928 | Box 39 \ 2 Scan197 | |
| Recommended tyre pressures for 40/50 HP and 20 HP models. | 3rd Nov 1928 | Box 39 \ 2 Scan198 | |
| Depot sheet detailing recommended tyre pressures for the 20 HP model. | 1st Nov 1928 | Box 39 \ 2 Scan199 | |
| Request to test the effect of different back axle gear ratios on petrol consumption. | 28th Mar 1919 | Box 39 \ 2 Scan200 | |
| Petrol consumption in relation to various back axle gear ratios. | 3rd Apr 1919 | Box 39 \ 2 Scan201 | |
| Outlining a road resistance test procedure for cars. | 3rd Apr 1919 | Box 39 \ 2 Scan202 | |
| Requesting performance tests on cars, focusing on engine power, speed on hills, and the impact of various physical factors. | 24th Apr 1919 | Box 39 \ 2 Scan203 | |
| Performance variations between car 31-RB and 58-NA, and potential modifications. | 24th Apr 1919 | Box 39 \ 2 Scan204 | |
| Recommending weight reduction and discussing the manufacturing of bevel gearing in America. | 24th Apr 1919 | Box 39 \ 2 Scan205 | |
| Outlining the fundamental points for judging car performance. | 12th Oct 1925 | Box 39 \ 2 Scan206 | |
| Car acceleration in relation to weight and engine power, with graphs. | 12th Oct 1925 | Box 39 \ 2 Scan207 | |
| Factors affecting vehicle acceleration, including axle ratios, tractive resistance, carburation, and flywheel inertia. | 12th Jun 1925 | Box 39 \ 2 Scan208 | |
| Page discussing engine torque curves and acceleration performance. | 12th Oct 1925 | Box 39 \ 2 Scan209 | |
| The methodology for comparing car efficiency and performance. | 12th Oct 1925 | Box 39 \ 2 Scan210 | |
| The effects of wind resistance and hill climbing on car performance. | 12th Jun 1925 | Box 39 \ 2 Scan211 | |
| Vehicle acceleration and performance on gradients, referencing the Brooklands test hill. | 18th Oct 1925 | Box 39 \ 2 Scan212 | |
| Showing a graph and discussion on the relationship between vehicle acceleration and hill climbing gradients. | 12th Jun 1925 | Box 39 \ 2 Scan213 | |
| High-speed performance, analyzing windage, exhaust, and streamlining with a corresponding performance graph. | 12th Oct 1925 | Box 39 \ 2 Scan214 | |
| The impact of streamlining, gear ratios, and braking on vehicle performance. | 12th Oct 1925 | Box 39 \ 2 Scan215 | |
| The factors affecting a car's braking performance, such as friction, weight, and gradients. | 12th Oct 1925 | Box 39 \ 2 Scan216 | |
| Vehicle stopping distances and times, including the effect of gradients. | 12th Oct 1925 | Box 39 \ 2 Scan217 | |
| Vehicle braking performance, including a graph and analysis of wheel locking and retardation. | 12th Oct 1925 | Box 39 \ 2 Scan218 | |
| High-speed performance and acceleration of the Phantom compared to competitor vehicles. | 1st Oct 1926 | Box 39 \ 2 Scan219 | |
| Vehicle performance, comparing a 20 HP model against competitors and discussing braking tests on a Phantom. | 1st Oct 1926 | Box 39 \ 2 Scan220 | |
| Observations on the performance of a Lincoln car's suspension and a 6-cylinder A.C. engine. | 1st Oct 1926 | Box 39 \ 2 Scan221 | |
| Performance data comparison table for various motor cars over standing and flying mile distances. | 1st Oct 1926 | Box 39 \ 2 Scan222 | |
| Bar chart comparing the 'Displacement / Ton Mile' for various closed and open cars. | 8th Oct 1926 | Box 39 \ 2 Scan223 | |
| Blank page marked with a Print Room stamp. | 8th Oct 1926 | Box 39 \ 2 Scan224 | |
| Power curve graph for a 6-cylinder, 2-litre A.C. engine showing BHP against RPM. | 10th May 1928 | Box 39 \ 2 Scan225 | |
| The testing of a Chrysler Red Head 72, detailing its weight, gear ratio, and engine performance. | 10th May 1928 | Box 39 \ 2 Scan226 | |
| Car performance, including acceleration tests up Ticknall Hill and comparisons with other vehicles. | 10th May 1928 | Box 39 \ 2 Scan227 | |
| Performance review and comparison of a Chrysler car against other American contemporaries. | 10th May 1928 | Box 39 \ 2 Scan228 | |
| Report page analyzing a car's weight, safety, engine appendages, and body construction. | 22th Jun 1926 | Box 39 \ 2 Scan229 | |
| Letter to the Royal Automobile Club requesting a suitable road near Cambridge for a high-speed steering test. | 22th Jun 1926 | Box 39 \ 2 Scan230 | |
| Performance comparison report of an improved 20 HP car against the standard model and a Chrysler car. | 4th Apr 1929 | Box 39 \ 2 Scan231 | |
| Performance comparison of the 20 HP car against the 40/50 model, discussing modifications and weight impacts. | 8th Apr 1929 | Box 39 \ 2 Scan232 | |
| Test report on a 6.5 Litre Bentley, focusing on high-speed wobble and steering issues on poor surfaces. | 28th Jun 1928 | Box 39 \ 2 Scan233 | |
| Steering issues, focusing on column movement, wobbles, and a comparison with a Bentley vehicle's steering system. | 28th Jun 1928 | Box 39 \ 2 Scan234 | |
| Vehicle performance evaluation report on its brakes, engine, clutch, gearbox, and suspension. | 28th Jun 1928 | Box 39 \ 2 Scan235 | |
| Performance and production quality analysis of a Bentley, comparing it to a Phantom and a Chrysler. | 28th May 1919 | Box 39 \ 2 Scan236 | |
| Letter to Mr. B. Bonniksen inquiring about trialing an Isochronous Speedometer on an experimental car. | 28th May 1919 | Box 39 \ 2 Scan237 | |
| Letter from B. Bonniksen regarding the supply of a speedometer and suggesting an alternative manufacturer. | 29th May 1919 | Box 39 \ 2 Scan238 | |
| Letter from B. Bonniksen concerning overwhelming demand for the Isochronous Speedometer and a new manufacturing arrangement. | 30th May 1919 | Box 39 \ 2 Scan239 | |
| From EFC to EH requesting particulars for ordering a Bonniksen Isochronous Speedometer for an experimental car. | 30th May 1919 | Box 39 \ 2 Scan240 | |
| Bonnniksen Isochronous Speedometer, including details on flex length and catalogue supply. | 3rd Sep 1919 | Box 39 \ 2 Scan241 | |
| Information required for ordering a Bonniksen Dead Beat Speedometer. | 3rd Sep 1919 | Box 39 \ 2 Scan242 | |
| Requesting an experimental order of a Bonniksen Isochronous Speedometer for an Experimental car. | 4th Sep 1919 | Box 39 \ 2 Scan243 | |
| Notification of receipt for an Isochronous Speedometer and springs for experimentation. | 18th Oct 1919 | Box 39 \ 2 Scan244 | |
| Instruction sheet detailing the testing and incorrect readings of a Deschnevaux Speedometer. | 13th Dec 1917 | Box 39 \ 2 Scan245 | |
| Note on the repair findings for a Donnikson's Isochronous Speedometer. | 9th Mar 1920 | Box 39 \ 2 Scan246 | |
| Proposal for a new carburetter for chassis X.2766 and X.3511, detailing issues with the current design and suggesting improvements. | 24th Jan 1919 | Box 39 \ 2 Scan247 | |
| Proposed carburetter design, comparing it to other models and listing its five key advantages. | 24th Jan 1919 | Box 39 \ 2 Scan248 | |
| Continued report discussing lubrication with petrol and dust protection for a component under a 'No.2 scheme'. | 24th Jan 1919 | Box 39 \ 2 Scan249 | |
| Responding to a proposed carburettor design for chassis X.3511. | 17th Mar 1919 | Box 39 \ 2 Scan250 | |
| Seeking feedback on a previously sent suggestion for a carburetter with a floating emulsion tube. | 4th Feb 1919 | Box 39 \ 2 Scan251 | |
| Novel carburettor design and the possibility of patenting it. | 26th Feb 1919 | Box 39 \ 2 Scan252 | |
| Letter from R. to EH. discussing a proposed carburetter design, a patent application, and the merits of the existing design. | 11th Mar 1919 | Box 39 \ 2 Scan253 | |
| Letter discussing a carburetter sketch, its lack of patentable novelty, and its potential application and disadvantages for car and aircraft engines. | 11th Mar 1919 | Box 39 \ 2 Scan254 | |
| Carburetter design improvements, focusing on constant vacuum, diffuser jets, and various existing models. | 11th Mar 1909 | Box 39 \ 2 Scan255 | |
| Carburettor testing on different engine types and a conclusion on design principles. | 11th Mar 1919 | Box 39 \ 2 Scan256 | |
| The design considerations for a moving diffuser jet versus a larger suction chamber, focusing on control and air damping. | 28th Jul 1932 | Box 39 \ 2 Scan257 | |
| Visit to the Delco factory regarding adapting experimental battery ignition for the Eagle engine. | 17th Apr 1918 | Box 39 \ 3 Scan001 | |
| Report comparing Delco, Remy, and Dixie magneto ignition systems, and the reasoning for specific design choices. | 17th Apr 1918 | Box 39 \ 3 Scan002 | |
| Technical note comparing the design and performance of a distributor with the Liberty and Dixie distributors. | 17th Apr 1918 | Box 39 \ 3 Scan003 | |
| Distributor materials, comparing Bakelite and hard rubber, and issues with charring and surface sparks. | 17th Apr 1918 | Box 39 \ 3 Scan004 | |
| Technical discussion on the design and performance of the Remy ignition system's contact breaker. | 17th Apr 1918 | Box 39 \ 3 Scan005 | |
| The design and function of a contact breaker, focusing on rockers, wear, and an auxiliary rocker for preventing back-firing. | 17th Apr 1918 | Box 39 \ 3 Scan006 | |
| The features of Delco contact breakers, generator components, and voltage regulators used in engines. | 17th Apr 1918 | Box 39 \ 3 Scan007 | |
| Delco's separate dynamos and starting motors, detailing design makeshifts and issues with early models. | 17th Apr 1918 | Box 39 \ 3 Scan008 | |
| Description of pressing a hardened and ground band into a soft wheel to form an abutment for the rollers of the free wheel. | 17th Apr 1918 | Box 39 \ 3 Scan009 | |
| Suggestion to experiment with Bakerised linen for the rubbing blocks of contact breakers. | 6th Feb 1919 | Box 39 \ 3 Scan010 | |
| Letter from Diamond Fibre Coy. Ltd. detailing the properties and uses of Condensite Celeron. | 31th May 1919 | Box 39 \ 3 Scan011 | |
| Letter concerning an import license for goods from the Swiss Insulating Works Ltd. | 31th Jul 1919 | Box 39 \ 3 Scan012 | |
| Use of Bakelised Linen for electrical fittings and gears in automobiles and aero engines. | 25th Sep 1919 | Box 39 \ 3 Scan013 | |
| Using a material for driving a speedometer and correspondence with the Continental Fibre Co. | 24th Sep 1919 | Box 39 \ 3 Scan014 | |
| Letter from The Continental Fibre Company discussing the properties of Bakelite-Delecto and Continental-Bakelite. | 22th Sep 1919 | Box 39 \ 3 Scan015 | |
| Letter from The Continental Fibre Co. detailing the properties and applications of Bakelite gear material. | 19th May 1919 | Box 39 \ 3 Scan016 | |
| Letter requesting samples of various insulating materials for testing. | 14th Nov 1919 | Box 39 \ 3 Scan017 | |
| Letter regarding the supply of Swiss Works No.340 commutator micanite sheets and micanite parts for sparking plugs. | 1st Jul 1946 | Box 39 \ 3 Scan018 | |
| Quality of various magnetos, noting potential electrical issues with American Bosch machines due to cheaper materials. | 7th Feb 1920 | Box 39 \ 3 Scan019 | |
| Uses and properties of Bakelite-Micarta in American electrical and engineering work. | 21th Dec 1920 | Box 39 \ 3 Scan020 | |
| The use of Bakelite for impregnating coils, armatures, and condensers. | 21th Dec 1920 | Box 39 \ 3 Scan021 | |
| The materials and construction methods for ignition condensers, commutators, and electrical connections, comparing Mica and Bakelite. | 21th Dec 1920 | Box 39 \ 3 Scan022 | |
| Westinghouse's electrical work, sales figures, and the various applications of Bakelite-Micarta. | 21th Dec 1920 | Box 39 \ 3 Scan023 | |
| The uses of Bakelite in various automotive components, seeking Mr. Royce's comments. | 21th Dec 1920 | Box 39 \ 3 Scan024 | |
| On the 'Goshawk II' battery ignition, comparing various distributor designs and materials. | 24th Feb 1921 | Box 39 \ 3 Scan025 | |
| Series of questions regarding the properties and uses of different insulating materials. | 3rd Mar 1921 | Box 39 \ 3 Scan026 | |
| Visit to the Watford Magneto Company regarding the insulation material 'Beldalite' and its moulding process. | 15th Mar 1921 | Box 39 \ 3 Scan027 | |
| Moulding processes and materials such as Beldalite, ebonite, and Bakelite. | 15th Mar 1921 | Box 39 \ 3 Scan028 | |
| Manufacturing capabilities, testing magnetos, and sourcing moulding materials like Bakelite. | 1st Nov 1920 | Box 39 \ 3 Scan029 | |
| Letter concerning the development of an instrument board control switch using American-made components. | 3rd Mar 1921 | Box 39 \ 3 Scan030 | |
| Internal memorandum discussing anti-tampering measures and a new 4-position control switch for cars. | 10th Dec 1930 | Box 39 \ 3 Scan031 | |
| The American Bosch battery ignition coil, its properties, cost, and materials. | 15th May 1921 | Box 39 \ 3 Scan032 | |
| The American Bosch battery ignition distributor, comparing their manufacturing and pricing. | 1st Mar 1921 | Box 39 \ 3 Scan033 | |
| The use of insulating materials like bakelite and ebonite for electrical production. | 15th Mar 1921 | Box 39 \ 3 Scan034 | |
| Material choices and manufacturing processes for a new electrical department, including bakelite, porcelain, and metalwork. | 15th Mar 1921 | Box 39 \ 3 Scan035 | |
| Manufacturing procedures, comparing UK and US methods, and considering the in-house production of specific electrical components. | 10th Dec 1920 | Box 39 \ 3 Scan036 | |
| Adoption of Bakelite as an insulating material for various parts. | 18th Mar 1921 | Box 39 \ 3 Scan037 | |
| Use of Bakelite and stabalite instead of ebonite for electrical components to reduce costs. | 18th Mar 1921 | Box 39 \ 3 Scan038 | |
| Various insulating materials and the supply of a moulded ignition switch rotor. | 15th May 1921 | Box 39 \ 3 Scan039 | |
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