| Description | Date | Identifier | |
| Question and answer session on engine design, followed by a discussion on petrol injection and diesel work. | 12th Mar 1934 | Box 173 \ 2 img208 | |
| Diesel engine performance, hydrogenated fuel, and a comparative analysis of engine cooling system drag. | 12th Mar 1934 | Box 173 \ 2 img209 | |
| Hydraulic tappets, clutches, and specifications for LaSalle and Allison engines. | 12th Mar 1934 | Box 173 \ 2 img210 | |
| Specifications for a Single Plate 12-CB Clutch as supplied to Lincoln. | 14th Feb 1934 | Box 173 \ 2 img211 | |
| Letter from Wilcox-Rich Corporation regarding difficulties with hydraulic lifters and suggesting a design change. | 20th Feb 1934 | Box 173 \ 2 img212 | |
| Valve spring failures and preventative design measures for the Bentley. | 12th Mar 1934 | Box 173 \ 2 img213 | |
| Brief internal memo regarding cars from America and a previous conversation. | 12th Mar 1934 | Box 173 \ 2 img214 | |
| Cars arriving from America on the ship Berengaria. | 13th Mar 1934 | Box 173 \ 2 img215 | |
| Vehicle breakdown involving a valve spring failure on hotel letterhead. | 27th Feb 1934 | Box 173 \ 2 img216 | |
| Travel issues in the US and a suggestion regarding Bentley valve spring failures. | 27th Feb 1934 | Box 173 \ 2 img217 | |
| Experimenting with different oil grades (S.A.E. 30 and 10) for cold starting and resulting engine noise. | 27th Feb 1934 | Box 173 \ 2 img218 | |
| Letter discussing travel plans, the shipping of competitor cars, and a theory on valve spring failures. | 27th Feb 1934 | Box 173 \ 2 img219 | |
| On hotel letterhead regarding a Bentley's inadequate ground clearance in heavy snow and future travel plans. | 9th Mar 1934 | Box 173 \ 2 img220 | |
| Report from the USA detailing a twelfth valve spring failure, a worsening axle, and cold starting experiments. | 9th Mar 1934 | Box 173 \ 2 img221 | |
| Vehicle comparisons, valve spring failures, Bentley ground clearance issues, and travel plans. | 9th Mar 1934 | Box 173 \ 2 img222 | |
| Cablegram from Detroit about a failed hydraulic adjuster ball valve test, proposing a poppet valve with increased damping. | 13th Mar 1934 | Box 173 \ 2 img223 | |
| Conversation about competitor vehicles including Cadillac, Packard, and Essex Terraplane, and arrangements for testing and parts. | 14th Mar 1934 | Box 173 \ 2 img224 | |
| Buick's adoption of the Dubonnet scheme, oil cooling for aero engines, and travel plans. | 14th Mar 1934 | Box 173 \ 2 img225 | |
| Final tests conducted on Lead Bronze bearings. | 27th Feb 1934 | Box 173 \ 2 img226 | |
| Page 2 of a letter detailing a visit to General Motors Patent Section and arrangements for license negotiations with Allisons. | 21th Feb 1934 | Box 173 \ 2 img227 | |
| Engine bearing test #5, detailing the procedure, conditions, and results including dimensional changes. | 21th Feb 1934 | Box 173 \ 2 img228 | |
| Engine bearing test log number 5 for Allison Bearings, detailing performance metrics over time. | 21th Feb 1934 | Box 173 \ 2 img229 | |
| Engine bearing test results log for Allison Bearings, detailing oil temperatures, pressures, and torque loads at various RPMs. | 21th Feb 1934 | Box 173 \ 2 img230 | |
| Engine bearing test log for Test #5 on Allison Bearings, recording various parameters over time. | 22th Feb 1934 | Box 173 \ 2 img231 | |
| Engine bearing test #6, detailing the performance of a new Allison center main bearing specification S3-30. | 22th Feb 1934 | Box 173 \ 2 img232 | |
| Procedure for an overspeed test on a bearing. | 22th Feb 1934 | Box 173 \ 2 img233 | |
| Engine bearing test results for Allison Bearings, Test #6. | 22th Feb 1934 | Box 173 \ 2 img234 | |
| Engine bearing test log data sheet for Test #6, focusing on Allison Bearings. | 22th Feb 1934 | Box 173 \ 2 img235 | |
| Engine bearing test results for Allison Bearings, Test #6. | 22th Feb 1934 | Box 173 \ 2 img236 | |
| Engine bearing overspeed test, detailing temperature and torque load changes at various RPMs. | 23th Feb 1934 | Box 173 \ 2 img237 | |
| Test report on engine bearing performance, detailing issues with lead sweat, distortion, and wear. | 23th Feb 1934 | Box 173 \ 2 img238 | |
| The wear analysis of intermediate, end, and center main bearings after a series of engine tests. | 23th Feb 1934 | Box 173 \ 2 img239 | |
| Engine bearing test results log for Test #7 on Allison Bearings. | 23th Feb 1934 | Box 173 \ 2 img240 | |
| Engine bearing test results for Allison bearings, including dynamometer data. | 23th Feb 1934 | Box 173 \ 2 img241 | |
| Engine bearing test results for Test #7, detailing crankshaft and Allison main bearing wear measurements. | 27th Feb 1934 | Box 173 \ 2 img242 | |
| Summary of results from bearing tests on an engine test rig for center main bearings. | 27th Feb 1934 | Box 173 \ 2 img243 | |
| Engine on a test bed connected to a large Heenan & Froude dynamometer. | 27th Feb 1934 | Box 173 \ 2 img244 | |
| Photograph of an engine on a test bed, connected to a Heenan & Froude dynamometer. | 27th Feb 1934 | Box 173 \ 2 img245 | |
| Large V-12 engine undergoing testing on a dynamometer in a workshop. | 27th Feb 1934 | Box 173 \ 2 img246 | |
| Photograph of a V-12 engine on a dynamometer test rig inside a workshop. | 27th Feb 1934 | Box 173 \ 2 img247 | |
| Photograph of an industrial workshop with testing equipment and machinery. | 27th Feb 1934 | Box 173 \ 2 img248 | |
| Photograph of a workshop showing a large Avery scale and control panel, likely for engine or component testing. | 15th Mar 1934 | Box 173 \ 2 img249 | |
| Relaying a cable message from the U.S.A. regarding a hydraulic adjuster ball valve. | 15th Mar 1934 | Box 173 \ 2 img250 | |
| Telegram received by telephone from Detroit regarding issues with a hydraulic adjuster for a ball valve. | 13th Mar 1934 | Box 173 \ 2 img251 | |
| Telegram message arranging a telephone call at the Detroit Athletic Club. | 4th Nov 1942 | Box 173 \ 2 img252 | |
| Night cable letter regarding customs duty arrangements for a car imported on an 'Acquit Caution'. | 5th Mar 1934 | Box 173 \ 2 img253 | |
| Letter from Mr. Robotham to Mr. Hives regarding Bentley front brakes and ethylene glycol cooling information. | 5th Mar 1934 | Box 173 \ 2 img254 | |
| Letter from W. A. Robotham to H. S. West concerning a LaSalle dynamo and a Chevrolet starter motor. | 5th Mar 1934 | Box 173 \ 2 img255 | |
| Letter from Delco-Remy Corporation regarding an enclosed outline for a Chevrolet starting motor and details on a LaSalle generator's fan ventilation. | 23th Feb 1934 | Box 173 \ 2 img256 | |
| Report concerning the air cooling of a LaSalle dynamo and a Chevrolet starter motor. | 5th Mar 1934 | Box 173 \ 2 img257 | |
| Letter from Delco-Remy Corporation discussing the fan ventilation of a La Salle generator and requesting information on direction indicators. | 3rd Feb 1934 | Box 173 \ 2 img258 | |
| Letter discussing high-temperature effects on lead bronze bearings and oil coolers, proposing hydrogen brazing as a solution. | 3rd Mar 1934 | Box 173 \ 2 img259 | |
| Letter discussing a mishap, progress in lead bronze bearing production, and a meeting to arrange a license. | 3rd Mar 1934 | Box 173 \ 2 img260 | |
| Letter detailing a visit to Allison's and a Plymouth plant to observe manufacturing processes and bearing development. | 3rd Mar 1934 | Box 173 \ 2 img261 | |
| Letter discussing production improvements, business opportunities in bearing production, and a material change to lead bronze. | 16th Mar 1934 | Box 173 \ 2 img262 | |
| Letter regarding delayed correspondence and the development of high-temperature lead bronze bearings in the U.S.A. | 16th Mar 1934 | Box 173 \ 2 img263 | |
| With a sketch of an Allison cylinder head, discussing petrol injection and compression ignition for flying boats. | 4th Mar 1934 | Box 173 \ 2 img264 | |
| Engine performance tests, valve overlap, and safety fuel characteristics. | 4th Mar 1934 | Box 173 \ 2 img265 | |
| Travel plans back to England and the potential to gather information on independent suspension in Detroit. | 16th Mar 1934 | Box 173 \ 2 img266 | |
| Report from the USA with a blueprint of an Allison-style engine head, discussing petrol injection and performance data. | 16th Mar 1934 | Box 173 \ 2 img267 | |
| Engine running difficulties, safety fuel properties, and a planned trip to Detroit to research independent suspension. | 16th Mar 1934 | Box 173 \ 2 img268 | |
| Procurement and evaluation of competing American cars for research purposes, including Cadillac, Packard and Hudson. | 16th Mar 1934 | Box 173 \ 2 img269 | |
| Telegram received by telephone regarding credit for chassis parts and a defective supercharger. | 19th Mar 1934 | Box 173 \ 2 img270 | |
| Telegram received by telephone regarding a potential purchase for Bentley. | 19th Mar 1934 | Box 173 \ 2 img271 | |
| Telephoned telegram message from Rowbotham regarding a preferential fitting for an order sailing to New York. | 20th Mar 1934 | Box 173 \ 2 img272 | |
| Relaying a cable from the USA about a credit for LaSalle parts and a recommendation to purchase a Graham car for Bentley. | 20th Mar 1934 | Box 173 \ 2 img273 | |
| Cablegram from Detroit recommending the purchase of a Graham Eight supercharger for a Bentley. | 19th Mar 1934 | Box 173 \ 2 img274 | |
| From New York discussing pivoted brake shoes, valve tests, and Condor type cylinder heads. | 8th Mar 1934 | Box 173 \ 2 img275 | |
| Page two of a report discussing engine development, glycol leaks, oil consumption, and interactions with Wright and Eclipse Aviation. | 8th Mar 1934 | Box 173 \ 2 img276 | |
| Competing technologies including Rotax starters, variable pitch propellers, and Packard crankcase designs. | 5th Mar 1934 | Box 173 \ 2 img277 | |
| Letter discussing exhaust-valve operation with leaded fuels and combustion chamber forms. | 5th Mar 1934 | Box 173 \ 2 img278 | |
| Findings on pivoted brake shoes, an engine type test at Wrights, and Condor type cylinder heads. | 20th Mar 1934 | Box 173 \ 2 img279 | |
| Engine development discussions, including glycol leaks, cylinder heads, and valve sizes. | 20th Mar 1934 | Box 173 \ 2 img280 | |
| Wright's oil consumption control methods and a visit to Eclipse Aviation Corporation regarding their various projects. | 20th Mar 1934 | Box 173 \ 2 img281 | |
| General Motors pamphlet on knee action and a water-cooled Packard crankcase design. | 20th Mar 1934 | Box 173 \ 2 img282 | |
| Letter from the National Advisory Committee for Aeronautics discussing a report on exhaust-valve operation with leaded fuels and combustion chamber design. | 5th Mar 1934 | Box 173 \ 2 img283 | |
| Visit to General Motors concerning the development and production of lead bronze bearings. | 22th Mar 1934 | Box 173 \ 2 img284 | |
| Lead bronze bearings, testing procedures, and production rights. | 22th Mar 1934 | Box 173 \ 2 img285 | |
| Visit to General Motors to investigate the production processes for lead bronze bearings, including challenges, materials, and patent considerations. | 6th Mar 1934 | Box 173 \ 2 img286 | |
| G.M. Truck Co.'s bearing tests using lead bronze and leaded oil, noting the resulting surface deposit. | 22th Mar 1934 | Box 173 \ 2 img287 | |
| Lasalle Chassis parts, specifically superchargers, and seeking clarification on how to purchase them. | 22th Mar 1934 | Box 173 \ 2 img288 | |
| Authorizing a credit of $300 to the American Company for Lasalle chassis parts. | 22th Mar 1934 | Box 173 \ 2 img289 | |
| Telegram from New York to Derby advising of a delayed arrival. | 22th Mar 1934 | Box 173 \ 2 img290 | |
| Telegram received by telephone regarding a delayed arrival from New York. | 22th Mar 1934 | Box 173 \ 2 img291 | |
| Night letter cable to Allison Engineering Co. querying the dispatch of the remainder of bearings. | 22th Mar 1934 | Box 173 \ 2 img292 | |
| Letter from Mr. Robotham in New York to Mr. Hives discussing piston performance, engine comparisons with American cars, and potential Bentley improvements. | 5th Mar 1934 | Box 173 \ 2 img293 | |
| Report received from the U.S.A. detailing issues and observations regarding hydraulic silent tappets. | 23th Mar 1934 | Box 173 \ 2 img294 | |
| Poppet valve seats, valve lift curves, and the use of Cadillac tappets by other manufacturers. | 23th Mar 1934 | Box 173 \ 2 img295 | |
| Memorandum about a discussion with General Motors regarding issues with hydraulic silent tappets. | 12th Mar 1934 | Box 173 \ 2 img296 | |
| Valve mechanism design, performance, and testing methods. | 12th Mar 1934 | Box 173 \ 2 img297 | |
| Notes on the standardisation and use of Cadillac tappets by Packard and The White bus company. | 12th Mar 1934 | Box 173 \ 2 img298 | |
| The Bendix Aviation Corporation's two-speed supercharger, including a diagrammatic sketch of the drive employed. | 22th Mar 1934 | Box 173 \ 3 img001 | |
| The benefits of a two-speed supercharger and the operation of an automatic variable pitch propellor. | 22th Mar 1934 | Box 173 \ 3 img002 | |
| Description of the operation and performance of a semi-automatic transmission developed by the Eclipse Company. | 22th Mar 1934 | Box 173 \ 3 img003 | |
| Design, advantages, and disadvantages of a constant mesh helical gearbox. | 22th Mar 1934 | Box 173 \ 3 img004 | |
| With a diagram explaining the operation and advantages of a two-speed supercharger. | 10th Mar 1934 | Box 173 \ 3 img005 | |
| Description and performance review of an automatic variable-pitch propeller. | 10th Mar 1934 | Box 173 \ 3 img006 | |
| Semi-automatic transmission developed by the Eclipse Company, detailing its performance and design. | 10th Mar 1934 | Box 173 \ 3 img007 | |
| Page 4 of a gearbox analysis, listing disadvantages and a summary comparison. | 10th Mar 1934 | Box 173 \ 3 img008 | |
| Urgency of a £300 payment to Mr. Inskip. | 23th Mar 1934 | Box 173 \ 3 img009 | |
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