| Description | Date | Identifier | |
| Investigation of independent front wheel suspension, particularly in America, and the patent position of the Mercedes Benz design. | 19th Jan 1934 | Box 173 \ 2 img007 | |
| Research of independent front wheel springing, referencing developments in the USA. | 23th Jan 1934 | Box 173 \ 2 img008 | |
| Letter from Pratt & Whitney Aircraft Co. to Mr. Robotham enclosing two blueprints for a test house unit. | 24th Jan 1934 | Box 173 \ 2 img009 | |
| Heavily obscured document page with text visible only in the top-right corner. | 16th May 1934 | Box 173 \ 2 img010 | |
| Suggestions for independent wheel springing and customer feedback on the brakes of the first 3 1/4 litre Bentley. | 30th Jan 1934 | Box 173 \ 2 img012 | |
| Independent springing systems, comparing existing designs and proposing a new, improved scheme. | 29th Jan 1934 | Box 173 \ 2 img013 | |
| Schematic drawing of a mechanical linkage assembly in multiple views. | 31th Jan 1934 | Box 173 \ 2 img014 | |
| Blueprint of an improved form of wheel control with independent springing. | 27th Jan 1934 | Box 173 \ 2 img015 | |
| Feedback letter concerning the performance of a 3 1/2 Litre Bentley. | 29th Jan 1934 | Box 173 \ 2 img016 | |
| Letter detailing initial user feedback and complaints about a new car, including a postscript from an insurance broker. | 29th Jan 1934 | Box 173 \ 2 img017 | |
| Formulas and variable definitions for centrifugal blowers. | 22th Mar 1933 | Box 173 \ 2 img018 | |
| Performance graph for a Goshawk Blower 144X, plotting coefficients K and η against V/L for various rotor speeds. | 22th Mar 1933 | Box 173 \ 2 img019 | |
| Performance graph showing delivery pressure, efficiency, and horse power against air flow for a gearbox and blower. | 25th Jan 1933 | Box 173 \ 2 img020 | |
| Hand-drawn sketch of a manifold or pipe assembly with handwritten notes. | 15th Dec 1933 | Box 173 \ 2 img021 | |
| Hs. to Em. forwarding a note from Da. | 1st Feb 1934 | Box 173 \ 2 img022 | |
| Pros and cons of different independent wheel springing designs, focusing on tyre scrubbing and steering geometry. | 31th Jan 1934 | Box 173 \ 2 img023 | |
| Note regarding asymmetrical triangles in plan view to avoid interference with a radiator. | 31th Jan 1934 | Box 173 \ 2 img024 | |
| Correspondence from Wilcox-Rich Corporation regarding a hydraulic tappet blueprint, a potential defect, and design improvements. | 27th Jan 1934 | Box 173 \ 2 img025 | |
| Blueprint for a Hydraulic Lifter for a Dodge Truck. | 9th Jan 1934 | Box 173 \ 2 img026 | |
| Hand-drawn sketch of various items hanging from a line. | 21th Jan 1924 | Box 173 \ 2 img027 | |
| Quote from Harrison Division of General Motors for equipment to manufacture core stock. | 7th Feb 1934 | Box 173 \ 2 img028 | |
| Letter from General Motors Corporation regarding unsettled questions of manufacturing rights and licenses. | 7th Feb 1934 | Box 173 \ 2 img029 | |
| Rear spring friction, with comparisons to Cadillac vehicles and a table of theoretical formulae. | 9th Feb 1934 | Box 173 \ 2 img030 | |
| Continued analysis of spring friction, including formulas and comparisons of different spring types and their performance. | 9th Feb 1934 | Box 173 \ 2 img031 | |
| Technical memorandum page discussing spring friction, comparing cantilever and flat spring designs and performance. | 14th Feb 1934 | Box 173 \ 2 img032 | |
| 'Spectre' model, engine development, and ongoing issues with braking systems. | 14th Feb 1934 | Box 173 \ 2 img033 | |
| Conclusion on the ineffectiveness of evaporative cooling and the start of testing Ethylene Glycol on the 600 HP Kestrel engine. | 14th Feb 1934 | Box 173 \ 2 img034 | |
| Proposed rig tests for a modified lubrication system on Kestrel main bearings following recommendations from Allison. | 6th Feb 1934 | Box 173 \ 2 img035 | |
| Improving main engine bearings, discussing lubrication, clearances, and new metal alloys. | 6th Jul 1931 | Box 173 \ 2 img036 | |
| Hand-drawn comparison of crankshaft oil system drilling methods for Allison and Kestrel engines. | 6th Jul 1931 | Box 173 \ 2 img037 | |
| Proposed rig tests for a modified lubrication system on Kestrel main bearings, following recommendations from Allison. | 20th Feb 1934 | Box 173 \ 2 img038 | |
| Bearing clearances, crankshaft drilling, and bearing metal alloy tests. | 1st Feb 1934 | Box 173 \ 2 img039 | |
| Blueprint comparing designs for a continuous oil system in Allison and Kestrel crankshafts. | 6th Feb 1934 | Box 173 \ 2 img040 | |
| Letter from Harrison Radiator Corporation regarding the composition and application of solder for Prestone radiators. | 16th Feb 1934 | Box 173 \ 2 img041 | |
| Unreadable document that appears to be a heavily degraded or overexposed photocopy. | 22th Aug 1934 | Box 173 \ 2 img042 | |
| Telegram received by telephone from Indianapolis regarding flywheel ratio and dynamo performance. | 22th Aug 1934 | Box 173 \ 2 img043 | |
| Telegram received by telephone from Indianapolis regarding clutch, flywheel, and dynamo performance. | 22th May 1934 | Box 173 \ 2 img044 | |
| Cablegram concerning the procurement of electrical furnace equipment for bearing production. | 21th May 1932 | Box 173 \ 2 img045 | |
| Letter from Wright Aeronautical to W. A. Robotham regarding a report on exhaust valves and the Conqueror engine. | 13th Mar 1934 | Box 173 \ 2 img046 | |
| Outstanding purchases made in the U.S.A., including a Cadillac car, pistons, oil coolers, and a clutch. | 20th Mar 1934 | Box 173 \ 2 img047 | |
| The shipping arrangements for a Graham Paige 8-cylinder Supercharged car. | 13th Mar 1934 | Box 173 \ 2 img048 | |
| Special body order form for a Style 6275 Fleetwood Limousine. | 13th Mar 1934 | Box 173 \ 2 img049 | |
| Vehicle specification sheet detailing appointments, chassis, and extra equipment. | 12th Mar 1934 | Box 173 \ 2 img050 | |
| Order form for a V-16 Cadillac Seven Passenger Limousine. | 12th Mar 1934 | Box 173 \ 2 img051 | |
| Letter to Graham Paige Motor Car Co. confirming the order of a supercharged sedan for evaluation. | 20th Mar 1934 | Box 173 \ 2 img052 | |
| Letter to the Chief Engineer of Graham Paige Motor Car Co. proposing the purchase of an eight-cylinder supercharged car. | 20th Mar 1934 | Box 173 \ 2 img053 | |
| Bill of sale for a Cadillac V-16 seven-passenger limousine to J.S. Inskip. | 21th Mar 1934 | Box 173 \ 2 img054 | |
| Notarized Bill of Sale for a vehicle, executed in New York. | 21th Mar 1934 | Box 173 \ 2 img055 | |
| Telegram about sourcing electrical equipment for bearing production from Dayton, Ohio. | 21th Feb 1934 | Box 173 \ 2 img056 | |
| Telegram received by telephone regarding a furnace order. | 22th Feb 1934 | Box 173 \ 2 img057 | |
| Two cable messages received from the USA regarding equipment and engine components. | 22th Feb 1934 | Box 173 \ 2 img058 | |
| Letter containing crankshaft inertia and critical frequency calculations. | 20th Feb 1934 | Box 173 \ 2 img059 | |
| Bentley engine performance notes on crank inertia, piston efficiency, and bearing tests. | 20th Feb 1934 | Box 173 \ 2 img060 | |
| Purchase of a 16-cylinder Cadillac and a Terraplane for technical assessment. | 19th Feb 1934 | Box 173 \ 2 img061 | |
| The specifications of a single plate long clutch, with comparisons to those used in Lincoln & Packard vehicles. | 13th Feb 1934 | Box 173 \ 2 img062 | |
| Camshafts, supercharging, and gearboxes, with observations on competitor designs. | 13th Feb 1934 | Box 173 \ 2 img063 | |
| Memo discussing and comparing various automotive systems including brakes, shock dampers, and lubrication. | 13th Feb 1934 | Box 173 \ 2 img064 | |
| Automatic induction scheme, brake gear banjos, and front-end drive systems. | 13th Feb 1934 | Box 173 \ 2 img065 | |
| Timing gear design and coachwork rattles, suggesting comparative testing against American methods. | 13th Feb 1934 | Box 173 \ 2 img066 | |
| Instructing to gather more first-hand information. | 23th Feb 1934 | Box 173 \ 2 img067 | |
| Report from the USA discussing clutch, camshaft, and supercharging technology from various car manufacturers. | 23th Feb 1934 | Box 173 \ 2 img068 | |
| Gearbox durability, simplified brake systems, shock dampers, and lubrication methods. | 28th Feb 1934 | Box 173 \ 2 img069 | |
| Front end drive, silent chains, and chassis rattles, comparing with American car manufacturers. | 23th Feb 1934 | Box 173 \ 2 img070 | |
| Memo comparing the engine smoothness and specifications of a Hudson Terraplane with a Rolls-Royce 20/25. | 19th Feb 1934 | Box 173 \ 2 img071 | |
| Comparison of engine performance, smoothness, and features against a Terraplane unit. | 19th Feb 1934 | Box 173 \ 2 img072 | |
| Analysis of a competitor's engine, focusing on crankshaft and connecting rod dimensions. | 19th Feb 1934 | Box 173 \ 2 img073 | |
| Analysis of an engine's design, components, and performance characteristics. | 19th Feb 1934 | Box 173 \ 2 img074 | |
| Engine mounting systems and proposals for future engine designs. | 19th Feb 1934 | Box 173 \ 2 img075 | |
| Comparison of engine technology, smoothness, and power output, referencing a Hudson model against a 1934 25 HP Rolls-Royce. | 19th Feb 1934 | Box 173 \ 2 img076 | |
| On gearbox improvements, referencing a Terraplane gearbox design and the potential use of a Peregrine gearbox on a Bentley. | 19th Feb 1934 | Box 173 \ 2 img077 | |
| Technical note on crankshaft dampers and split axle independent suspension. | 19th Feb 1934 | Box 173 \ 2 img078 | |
| Independent suspension experiments and comparisons with other contemporary cars. | 19th Feb 1934 | Box 173 \ 2 img079 | |
| Technical note detailing observations on piston design, including Cadillac's experimental findings and issues with T-slot pistons and rings. | 19th Feb 1934 | Box 173 \ 2 img080 | |
| Observations on piston ring performance, oil consumption, and piston design. | 25th Jan 1934 | Box 173 \ 2 img081 | |
| Anodised piston surfaces, aluminum connecting rods and aero engine detonation. | 25th Jan 1934 | Box 173 \ 2 img082 | |
| Engine performance, detailing fuel detonation curves, M.E.P. limits for different cooling systems, and maximum jacket temperatures. | 25th Jan 1934 | Box 173 \ 2 img083 | |
| Aero engine component performance, particularly regarding oil coolers, freezing prevention, and carburetors. | 23th Feb 1934 | Box 173 \ 2 img084 | |
| Visit to the Hudson Essex Plant, comparing a Terraplane 6-cylinder engine with the R.R. 20/25 unit. | 23th Feb 1934 | Box 173 \ 2 img085 | |
| Analysis of an engine's smoothness, crankshaft, and connecting rod dimensions compared to competitors. | 23th Feb 1934 | Box 173 \ 2 img086 | |
| Analysis of American engine designs, focusing on mountings, combustion chambers, and a specific six-cylinder engine. | 23th Feb 1934 | Box 173 \ 2 img087 | |
| Engine comparisons, gearbox development, and crankshaft damper design, referencing American car technology. | 23th Feb 1934 | Box 173 \ 2 img088 | |
| Different types of suspension, frames and pistons from competing car manufacturers. | 23th Feb 1934 | Box 173 \ 2 img089 | |
| Technical report discussing findings on piston rings, oil consumption, and connecting rods. | 23th Feb 1934 | Box 173 \ 2 img090 | |
| Engine detonation, including a performance graph and a comparison of M.E.P. between water-cooled and air-cooled engines. | 23th Feb 1934 | Box 173 \ 2 img091 | |
| Engine operating temperatures, cooling systems, and anti-icing measures. | 23th Feb 1934 | Box 173 \ 2 img092 | |
| Visit to a strip bearing factory, Ford bearings, connecting rod to crank ratios, and engine hot spots. | 15th Feb 1934 | Box 173 \ 2 img093 | |
| From road tests comparing a Bentley against Cadillac, and Packard vehicles. | 15th Feb 1934 | Box 173 \ 2 img094 | |
| Engine design, including silent tappets and valve configurations, with comparisons to Cadillac. | 15th Feb 1934 | Box 173 \ 2 img095 | |
| Engine design choices and the emerging superiority of steel bodies over coachbuilt ones. | 15th Feb 1934 | Box 173 \ 2 img096 | |
| Combining chassis and coachwork, and a drawing sent to Cadillac. | 14th Feb 1934 | Box 173 \ 2 img097 | |
| Report from the U.S. covering a bearing factory visit, crank ratios, thermostats, and road tests. | 14th Feb 1934 | Box 173 \ 2 img098 | |
| Report comparing Cadillac engines, discussing engine design choices, and the challenges posed by steel bodies to traditional coachwork. | 24th Feb 1934 | Box 173 \ 2 img099 | |
| The licensing and production process of Lead Bronze Bearings with the Allison Engineering Company. | 9th Feb 1934 | Box 173 \ 2 img100 | |
| Allison's bearing production process and a visit to Gleason's concerning rear axle bevels. | 9th Feb 1934 | Box 173 \ 2 img101 | |
| Gear lapping, checking, and cutting operations, proposing modifications to improve bedding. | 9th Feb 1934 | Box 173 \ 2 img102 | |
| Hand-drawn diagram illustrating the process for normal casting of lead bronze bearings. | 20th Feb 1934 | Box 173 \ 2 img103 | |
| Letter from Long Manufacturing Company regarding clutch specifications for Packard and Lincoln. | 20th Feb 1934 | Box 173 \ 2 img104 | |
| Specification sheet for a Single Plate 12-CB Clutch as supplied to Lincoln. | 14th Feb 1934 | Box 173 \ 2 img105 | |
| Telegram from Indianapolis reporting the successful completion of tests on grooved bearings. | 24th Feb 1934 | Box 173 \ 2 img106 | |
| Telegram message received by telephone regarding grooved bearings and engine revolutions. | 24th Feb 1934 | Box 173 \ 2 img107 | |
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