| Description | Date | Identifier | |
| Statement from the New York Athletic Club for W.A. Robotham's guest expenses. | 28th May 1934 | Box 173 \ 3 img210 | |
| Letter to Rolls-Royce of America regarding an involved account statement and sales. | 21th Jun 1934 | Box 173 \ 3 img211 | |
| Graph comparing the Brake Mean Effective Pressure curves for various Cadillac and Rolls Royce products. | 31th Jan 1934 | Box 173 \ 3 img212 | |
| Comparison of engine valve timings and durations for various vehicle models including Cadillac, La Salle, Standard, and Bentley. | 31th Jan 1934 | Box 173 \ 3 img213 | |
| Letter from Wright Aeronautical Corporation regarding Conqueror engine performance with Prestone coolant and Stellite exhaust valve issues. | 26th Jul 1934 | Box 173 \ 3 img214 | |
| Graph detailing heat rejection to Prestone during performance characteristics tests for a GV-1570-D Conqueror engine. | 23th Feb 1932 | Box 173 \ 3 img215 | |
| Performance characteristics chart for a Wright Aeronautical Corporation GV-1570-D Conqueror engine at full throttle. | 23th Feb 1932 | Box 173 \ 3 img216 | |
| Letter from Arthur Nutt of Wright Aeronautical Corporation to W.A. Robotham regarding a planned visit to England. | 27th Jul 1934 | Box 173 \ 3 img217 | |
| Letter from Harrison Radiator Corporation regarding a potential visit by Mr. Ellor. | 15th Jan 1935 | Box 173 \ 3 img218 | |
| Letter of introduction for Mr. William Finlay from Wright Aeronautical Corporation. | 11th Feb 1935 | Box 173 \ 3 img219 | |
| Letter to G.W. Vaughan of the Wright Aeronautical Corporation regarding a visit from Mr. Finlay. | 14th May 1935 | Box 173 \ 3 img220 | |
| Letter from G. W. Vaughan of Wright Aeronautical Corporation to W. A. Robotham concerning a visit from Mr. Finley. | 28th May 1955 | Box 173 \ 3 img221 | |
| Thank you letter from Wright Aeronautical Corporation following a visit to Derby. | 13th Jun 1935 | Box 173 \ 3 img222 | |
| Letter from M. B. Gordon to Mr. W. A. Robotham thanking him for his courtesy during a visit to Derby. | 22th Oct 1935 | Box 173 \ 3 img223 | |
| Forwarding of correspondence on Superflexit oil pipes. | 31th Oct 1941 | Box 173 \ 4 img001 | |
| Status update memo listing various jobs in hand, including work on clutches, gear levers, and wheels. | 1st Nov 1935 | Box 173 \ 4 img002 | |
| Letter to Cadillac regarding engineer visits, standardization of parts, and brake systems. | 4th Nov 1935 | Box 173 \ 4 img003 | |
| Letter discussing chassis brakes, a motor show, and business in the States. | 4th Nov 1935 | Box 173 \ 4 img004 | |
| Letter to Ford Motor Company requesting an introduction for a colleague and discussing radiator shutters. | 4th Nov 1935 | Box 173 \ 4 img005 | |
| Letter of introduction for two engineers, Messrs. Day and Grylls, visiting various automotive companies in the USA. | 4th Nov 1935 | Box 173 \ 4 img006 | |
| List of information required for an experimental visit to the United States in 1935. | 4th Nov 1935 | Box 173 \ 4 img007 | |
| List of engineering topics for discussion or investigation, covering engine efficiency, supercharging, and chassis components. | 4th Nov 1935 | Box 173 \ 4 img008 | |
| Competitor vehicle features, engine trends, and performance analysis of American cars. | 4th Nov 1935 | Box 173 \ 4 img009 | |
| Visits to various US automotive and parts manufacturers for information gathering and to address component issues. | 4th Nov 1935 | Box 173 \ 4 img010 | |
| Letter of introduction for Mr. Grylls to visit The Gemmer Manufacturing Co. regarding their interest in Marles steering. | 5th Nov 1935 | Box 173 \ 4 img011 | |
| Letter from Ford's General Manager to Mr. Robotham regarding arrangements for a Mr. Grylls to visit Ford's Engineering Department. | 6th Nov 1935 | Box 173 \ 4 img012 | |
| Letter to Ford Motor Co. Ltd. arranging an introduction for Mr. Grylls to Mr. Sorensen. | 8th Nov 1935 | Box 173 \ 4 img013 | |
| Failure of metal bearings during testing and an interest in an alternative. | 11th Nov 1935 | Box 173 \ 4 img014 | |
| Letter to S.H. Grylls discussing front axle control, 12-cylinder engine costs, and crankshaft dampers. | 13th Nov 1935 | Box 173 \ 4 img015 | |
| Alternative methods for finishing connecting rods and requesting a cost analysis for parts. | 13th Nov 1935 | Box 173 \ 4 img016 | |
| Request for information, price, and delivery date for a Lincoln Zephyr V-12 car. | 14th Nov 1935 | Box 173 \ 4 img017 | |
| Letter from Packard Motor Car Company to Rolls-Royce Ltd. regarding an upcoming visit. | 18th Nov 1935 | Box 173 \ 4 img018 | |
| Cablegram from Detroit about using rubber shackles to fix tire noise, suspension silence, and steering wander. | 19th Nov 1935 | Box 173 \ 4 img019 | |
| Circulating a telegram from America discussing various automotive design features. | 21th Nov 1935 | Box 173 \ 4 img020 | |
| Night letter cablegram regarding Olley's objections to front suspension systems on various American and European cars. | 19th Nov 1935 | Box 173 \ 4 img021 | |
| Series of questions about Buick's quietness, rubber shackles, and volumetric efficiency of different valve types. | 19th Nov 1935 | Box 173 \ 4 img022 | |
| List of discussion points or topics, possibly from a meeting. | 21th Nov 1935 | Box 173 \ 4 img023 | |
| List of queries regarding American automotive manufacturing methods and components. | 21th Nov 1935 | Box 173 \ 4 img024 | |
| Outlining travel arrangements for Mr. Ward of Park Wards for his trip to the United States. | 21th Nov 1935 | Box 173 \ 4 img025 | |
| Night letter cablegram to Grylls in Detroit regarding torsion rods, wishbones, and cadmium bearings. | 22th Nov 1935 | Box 173 \ 4 img026 | |
| Travel and work arrangements for studying rust prevention on steel coachwork. | 21th Nov 1935 | Box 173 \ 4 img027 | |
| Telegram from America discussing automotive technologies and competitor analysis. | 21th Nov 1935 | Box 173 \ 4 img028 | |
| Letter concerning a trip to America to research rust prevention on bodies and a query about cadmium versus lead bronze bearings. | 22th Nov 1935 | Box 173 \ 4 img029 | |
| Telegram received by telephone from Detroit, Michigan, detailing gear design specifications. | 23th Nov 1935 | Box 173 \ 4 img030 | |
| Telegram received by telephone from Detroit regarding GM research and cadmium. | 23th Nov 1935 | Box 173 \ 4 img031 | |
| Transcribing a cablegram received from Grylls in the U.S.A. | 23th Nov 1935 | Box 173 \ 4 img032 | |
| Night letter cablegram sent to Grylls at the Book Cadillac Hotel in Detroit, USA. | 25th Nov 1935 | Box 173 \ 4 img033 | |
| Cablegram from Detroit comparing competitor vehicle components and technologies. | 21th May 1935 | Box 173 \ 4 img034 | |
| Relaying the content of a telegram regarding a steering box issue on a LaSalle vehicle. | 22th Nov 1936 | Box 173 \ 4 img035 | |
| Request for information on G.M. side valve combustion chamber designs, parts, and performance figures. | 26th Nov 1935 | Box 173 \ 4 img036 | |
| Cablegram from Detroit regarding copper-lead strip bearings and steering geometry for a Bentley. | 24th Jun 1935 | Box 173 \ 4 img037 | |
| Cablegram received from Mr. Grylls in the U.S.A. regarding copper lead strip bearings and steering geometry. | 26th Nov 1935 | Box 173 \ 4 img038 | |
| Cablegram from Detroit regarding cadmium bearing shells, production, and engine smoothness comparisons with competitors. | 27th Nov 1935 | Box 173 \ 4 img039 | |
| Cablegram received from Mr. Grylls in the U.S.A. regarding cadmium bearing shells and engine performance. | 27th Nov 1935 | Box 173 \ 4 img040 | |
| Manufacturing process for bearings and comparing opinions from other auto manufacturers. | 27th Nov 1935 | Box 173 \ 4 img041 | |
| Night letter cablegram about Stromberg carburetors flooding on gradients and requesting a solution. | 27th Nov 1935 | Box 173 \ 4 img042 | |
| Comparison of the smoothness of Cadillac V8 and V12 engines. | 27th Nov 1935 | Box 173 \ 4 img043 | |
| Forwarding a telegram regarding torsion bars, steering worms, and unequal links. | 27th Nov 1935 | Box 173 \ 4 img044 | |
| Issues with the Dubonnet suspension system compared to a wishbone type, based on experiences with Chevrolet. | 17th Nov 1938 | Box 173 \ 4 img045 | |
| Car handling, wandering issues, and suspension comparisons. | 17th Nov 1938 | Box 173 \ 4 img046 | |
| Notes on car design trends observed at the Detroit Motor Show. | 17th Nov 1938 | Box 173 \ 4 img047 | |
| Diagrams comparing two suspension geometries and their effect on oversteer and understeer. | 17th Nov 1938 | Box 173 \ 4 img048 | |
| Analysis table of factors affecting car handling during turns and braking. | 28th Nov 1935 | Box 173 \ 4 img049 | |
| Findings from a visit to Cadillac and Chevrolet in America regarding engine and chassis components. | 28th Nov 1935 | Box 173 \ 4 img050 | |
| Diagram illustrating the geometry and effective centres of a linkage or frame system. | 28th Nov 1935 | Box 173 \ 4 img051 | |
| Report comparing competitor suspension and cooling systems, with notes on internal designs. | 28th Nov 1935 | Box 173 \ 4 img052 | |
| Comparing a Cadillac to a Bentley Mark V, detailing performance, fuel consumption, and temperature readings from a test run. | 8th Nov 1935 | Box 173 \ 4 img053 | |
| And diagrams concerning rubber shackles, chassis clearance, and air ram mounting. | 8th Nov 1935 | Box 173 \ 4 img054 | |
| The performance and suspension of a Torsionless coupe and V12 model. | 8th Nov 1935 | Box 173 \ 4 img055 | |
| Notes on issues concerning road shocks affecting roll centre and brake performance related to oil temperature. | 18th Nov 1935 | Box 173 \ 4 img056 | |
| From a visit to Cadillac and Chevrolet, discussing engine crankcase ventilation, acid fumes, and oil performance. | 18th Nov 1935 | Box 173 \ 4 img057 | |
| And diagrams concerning rubber shackles, tyre noise, and suspension geometry. | 4th Dec 1935 | Box 173 \ 4 img058 | |
| Oversteer and understeer at the GM Proving Ground, spring softness, and a formula for roll stability. | 4th Dec 1935 | Box 173 \ 4 img059 | |
| Visit to Cadillac, discussing engine comparisons, design choices, and material experiments. | 4th Dec 1935 | Box 173 \ 4 img060 | |
| Analysis of flywheel designs and a comparative study of various American car engines. | 4th Dec 1935 | Box 173 \ 4 img061 | |
| Brief note on the connecting rods of a Cadillac V-8 engine. | 4th Dec 1935 | Box 173 \ 4 img062 | |
| Blueprint detailing a flywheel design with torsional and lateral ratings, compared to a Cadillac. | 20th Nov 1935 | Box 173 \ 4 img063 | |
| Car performance and stability, including comparisons between models and a formula. | 20th Nov 1935 | Box 173 \ 4 img064 | |
| Report comparing Cadillacs and other cars, noting engine noise, chassis mounting issues, and bearing experiments. | 20th Nov 1935 | Box 173 \ 4 img065 | |
| Engine failures, corrosion, and vibrations, comparing Pontiac, Cadillac V12, and V8 engines. | 20th Nov 1935 | Box 173 \ 4 img066 | |
| Comparing engine specifications and discussing design considerations for a V8 engine. | 20th Nov 1935 | Box 173 \ 4 img067 | |
| Design drawing and analysis of a flywheel, possibly comparing it to a Cadillac component. | 20th Nov 1935 | Box 173 \ 4 img068 | |
| On Book-Cadillac Hotel letterhead discussing and comparing various engine features, including tappets and oil cooling systems. | 28th Nov 1935 | Box 173 \ 4 img069 | |
| Findings from a visit to the U.S.A. regarding tyre noise, suspension experiments, and torsion bars. | 28th Nov 1935 | Box 173 \ 4 img070 | |
| From Detroit discussing competitor frame construction and a comparison of Dubonnet and wish-bone suspension systems. | 17th Nov 1935 | Box 173 \ 4 img071 | |
| Report page discussing vehicle handling issues, including low-speed wobbles, steering, and tyre noise. | 18th Nov 1935 | Box 173 \ 4 img072 | |
| From Detroit discussing Chevrolet's suspension systems, associated costs and technical issues. | 18th Nov 1935 | Box 173 \ 4 img073 | |
| Solutions for vehicle joggle, tyre noise, and rear-axle steering issues. | 18th Nov 1935 | Box 173 \ 4 img074 | |
| Description of Chevrolet's method for fitting brake linings without rivets, with a postscript on shock damper mounting. | 28th Nov 1935 | Box 173 \ 4 img075 | |
| Faults of the Skinner Slide Valve Engine and requesting information on Packard's experience with it. | 28th Nov 1935 | Box 173 \ 4 img076 | |
| Tyre noise effects and experiments with rubber body mountings. | 29th Nov 1935 | Box 173 \ 4 img077 | |
| Cablegram from Detroit reporting on the rough performance of a Zephyr and plans to test a V8 Cadillac. | 30th Jan 1935 | Box 173 \ 4 img078 | |
| Night letter cablegram requesting technical information and opinions on competitor vehicles like Packard and Zephyr. | 30th Nov 1935 | Box 173 \ 4 img079 | |
| Competitor vehicle analysis, focusing on steering, engine performance, and reliability. | 30th Nov 1935 | Box 173 \ 4 img080 | |
| Tyre noise, the effectiveness of rubber shackles, and referencing American cars. | 30th Nov 1935 | Box 173 \ 4 img081 | |
| Cover note attaching a memo dated 19.11.35 which was received from America. | 3rd Dec 1935 | Box 173 \ 4 img082 | |
| Steering gear difficulties, particularly with the bronze box, and observations on oversteering and understeering. | 19th Nov 1935 | Box 173 \ 4 img083 | |
| Competitor steering and suspension designs, including Chevrolet and Citroen, and modifications to worm gear shapes. | 20th Nov 1935 | Box 173 \ 4 img084 | |
| Competitor vehicle suspension designs (Buick, Cadillac), tyre noise (Firestone), and a test drive of a Hudson. | 20th Nov 1935 | Box 173 \ 4 img085 | |
| Page discussing a formula for the angle of roll and commenting on Hudson suspension systems. | 4th Dec 1935 | Box 173 \ 4 img086 | |
| | | | |
