| Description | Date | Identifier | |
| Telegram received by telephone concerning travel plans to Detroit. | 24th Feb 1934 | Box 173 \ 2 img108 | |
| Cablegram from Indianapolis reporting the results of three bearing tests. | 24th Feb 1934 | Box 173 \ 2 img109 | |
| Query regarding customs duty and valuation for importing a second-hand car into Britain. | 16th Feb 1934 | Box 173 \ 2 img110 | |
| Memo discussing car model strategy, customs, and technical improvements. | 16th Feb 1934 | Box 173 \ 2 img111 | |
| Memo discussing competitor vehicles and the potential acquisition of a new model. | 16th Feb 1934 | Box 173 \ 2 img112 | |
| Memo discussing competitor cars (La Salle, Buick), their pricing, and engine technology for a Bentley. | 16th Feb 1934 | Box 173 \ 2 img113 | |
| Letter discussing engine gear options, clutch wear, and travel plans to various US aviation companies and airfields. | 26th Feb 1934 | Box 173 \ 2 img114 | |
| Report from the USA discussing the import of a Cadillac and Terraplane, customs valuation, and comparison with a Bentley. | 26th Feb 1934 | Box 173 \ 2 img115 | |
| Competitor vehicles and suggestions for product improvement, including engine and supercharger considerations. | 26th Feb 1934 | Box 173 \ 2 img116 | |
| US trip itinerary, vehicle issues with a clutch and a Bentley, and arrangements for company and customer visits. | 26th Feb 1934 | Box 173 \ 2 img117 | |
| Lead bronze bearing test no. 3, detailing various test procedures, conditions, and results. | 9th Feb 1934 | Box 173 \ 2 img118 | |
| Bearing reliability tests, including dimension measurements before and after testing. | 9th Feb 1934 | Box 173 \ 2 img119 | |
| Data log sheet for an Allison Bearings test, specifically Test No. 3. | 9th Feb 1934 | Box 173 \ 2 img120 | |
| Data log sheet for an Allison Bearings test, specifically Test No. 3, page 4. | 9th Feb 1934 | Box 173 \ 2 img121 | |
| Bearing test results log sheet for Allison Bearings, Test No. 3. | 24th Feb 1934 | Box 173 \ 2 img122 | |
| Analysing the differences between American and English vehicle operating conditions, focusing on clutches, springing, and gearboxes. | 24th Feb 1934 | Box 173 \ 2 img123 | |
| Night letter cable regarding the purchase of Dubonnet independent suspension units. | 27th Feb 1934 | Box 173 \ 2 img124 | |
| Continuation of a memo comparing Bentley, Studebaker, and General Motors. | 27th Feb 1934 | Box 173 \ 2 img125 | |
| Cablegram received from AHC regarding a fault on Kestrel engines. | 1st Jan 1934 | Box 173 \ 2 img126 | |
| Internal memorandum documenting a received cable and its distribution. | 1st Mar 1934 | Box 173 \ 2 img127 | |
| Telegram received by telephone concerning production arrangements for Detroit. | 1st Mar 1934 | Box 173 \ 2 img128 | |
| Cablegram regarding the arrangement for the installation of electrical bearing equipment. | 1st Mar 1934 | Box 173 \ 2 img129 | |
| Cable received from the U.S.A. about glycol maximum temperature. | 1st Mar 1934 | Box 173 \ 2 img130 | |
| Western Union Cablegram regarding Glycol maximum temperatures. | 1st Mar 1934 | Box 173 \ 2 img131 | |
| Telegram received by telephone regarding an urgent request for standard Glycol and temperature information for flights. | 1st Mar 1934 | Box 173 \ 2 img132 | |
| Telegram received by telephone regarding engine cylinder temperatures. | 1st Feb 1936 | Box 173 \ 2 img133 | |
| Night letter telegram requesting the composition of solder for aircraft radiators using high temperature glycol cooling. | 14th Feb 1934 | Box 173 \ 2 img134 | |
| Proposing improvements to the heating and quenching process for manufacturing lead bronze bearings. | 14th Feb 1934 | Box 173 \ 2 img135 | |
| Quenching problems with marine type bearings, alternative materials, and a visit to Cleveland Graphite. | 14th Feb 1934 | Box 173 \ 2 img136 | |
| Rough hand-drawn diagram illustrating a heating and cooling arrangement for components. | 1st Mar 1934 | Box 173 \ 2 img137 | |
| Report proposing an improved design for heating and quenching tackle for lead bronze bearings. | 1st Mar 1934 | Box 173 \ 2 img138 | |
| Challenges, testing, and production of lead bronze bearings. | 1st Mar 1934 | Box 173 \ 2 img139 | |
| Technical drawing showing the arrangement of a smoke eliminator for a jet propulsion unit. | 19th Jul 1940 | Box 173 \ 2 img140 | |
| Potential acquisition and modification of LaSalle and Cadillac cars for evaluation. | 17th Feb 1934 | Box 173 \ 2 img141 | |
| Analysis of a cheaper car model, comparing it to a Buick and the Rolls-Royce 20/25. | 17th Feb 1934 | Box 173 \ 2 img142 | |
| Modifying a 40/50 frame with American car parts and specifications for a special radiator solder. | 17th Feb 1934 | Box 173 \ 2 img143 | |
| Soldering procedures and an analysis of front end drive systems. | 17th Feb 1934 | Box 173 \ 2 img144 | |
| Gear cutting, chain drives, and engine noise in contemporary cars from competitors like Nash, Ford, Buick, and Bentley. | 17th Feb 1934 | Box 173 \ 2 img145 | |
| Comparing Morse roller chains with competitors like Reynolds and those used in Cadillac and Lincoln vehicles. | 17th Feb 1934 | Box 173 \ 2 img146 | |
| Page discussing engine design choices, comparing silent chains to gears and mentioning American car parts. | 17th Feb 1934 | Box 173 \ 2 img147 | |
| Memo regarding the dispatch of Morse Chain layouts, a Cadillac instruction book, M.E.P. curves, and axle ratio data. | 17th Feb 1934 | Box 173 \ 2 img148 | |
| Graph of valve lift in inches versus crankshaft degrees for a hydraulic tappet to be used on a Cadillac. | 1st Mar 1934 | Box 173 \ 2 img149 | |
| Telephone conversation about overcoming difficulties with lead bronze bearings, including manufacturing processes in the USA. | 1st Mar 1934 | Box 173 \ 2 img150 | |
| Note on the despatch schedule for bearings ordered from Allison. | 1st Mar 1934 | Box 173 \ 2 img151 | |
| Report from the USA about acquiring American cars, specifically Cadillac and La Salle, for evaluation. | 3rd Mar 1934 | Box 173 \ 2 img152 | |
| Car testing, parts interchangeability from a La Salle, radiator solder specifications, and front-end drives. | 3rd Mar 1934 | Box 173 \ 2 img153 | |
| Technical analysis of front-end gear and chain drives in contemporary American cars. | 3rd Mar 1934 | Box 173 \ 2 img154 | |
| Engine components like silent chains and camshafts, comparing them to American automotive designs. | 3rd Mar 1934 | Box 173 \ 2 img155 | |
| Graph of valve lift in inches versus crankshaft degrees, for use on a Cadillac with a hydraulic tappet. | 20th Feb 1934 | Box 173 \ 2 img156 | |
| Correspondence on Hotel Van Cleve letterhead reporting the failure of two new valve springs after high-speed driving. | 20th Feb 1934 | Box 173 \ 2 img157 | |
| Leaking radiator, detailing its failure, previous repairs, and difficulties during removal. | 20th Feb 1934 | Box 173 \ 2 img158 | |
| On Hotel Van Cleve letterhead regarding oil cooler figures and shock absorber development. | 5th Mar 1934 | Box 173 \ 2 img159 | |
| Night letter cable to Rolls-Royce America regarding a choice of cars. | 5th Mar 1934 | Box 173 \ 2 img160 | |
| Telegram received by telephone regarding travel to Detroit and arranging equipment installation to commence production. | 1st Mar 1934 | Box 173 \ 2 img161 | |
| Telegram from New York discussing a comparison between pancake and cylinder head engine designs. | 9th Mar 1934 | Box 173 \ 2 img162 | |
| Telegram message received by telephone regarding valve, crack, and plug testing. | 10th Mar 1933 | Box 173 \ 2 img163 | |
| Authority to spend £2,000 on equipment for manufacturing lead bronze bearings. | 5th Mar 1934 | Box 173 \ 2 img164 | |
| Bentley radiator leak complaint from the U.S.A., detailing issues with stud design and modifications. | 6th Mar 1934 | Box 173 \ 2 img165 | |
| Letter from Cadillac Motor Car Company regarding pictures and prints of a Bentley engine. | 26th Feb 1934 | Box 173 \ 2 img166 | |
| The 8-point construction of a Meuson engine cylinder. | 21th Feb 1934 | Box 173 \ 2 img167 | |
| Engine cooling with Glycol, operating temperatures, detonation, and supercharger issues. | 21th Feb 1934 | Box 173 \ 2 img168 | |
| Diagram illustrating the construction of an Allison engine cylinder, showing the shrunk-in liner. | 5th Mar 1934 | Box 173 \ 2 img169 | |
| The cylinder construction of the Allison engine following an inspection at Wright Field. | 5th Mar 1934 | Box 173 \ 2 img170 | |
| Glycol cooling specifications and operating temperature considerations. | 5th Mar 1934 | Box 173 \ 2 img171 | |
| Blueprint showing the construction of an Allison cylinder. | 5th Mar 1934 | Box 173 \ 2 img172 | |
| Visit to the Duesenberg plant with observations on their supercharger and engine design. | 23th Feb 1934 | Box 173 \ 2 img173 | |
| Visit to the Duesenburg plant, commenting on their production, supercharger, and engine design. | 7th Mar 1934 | Box 173 \ 2 img174 | |
| Letter from Harrison Radiator Corporation detailing oil cooler performance data with and without a cooler. | 13th Feb 1934 | Box 173 \ 2 img175 | |
| Cablegram concerning the import duty arrangements for a car brought over from America. | 5th Mar 1934 | Box 173 \ 2 img176 | |
| Customs arrangements for importing a Chrysler car from the U.S.A. | 7th Mar 1934 | Box 173 \ 2 img177 | |
| Report from the USA detailing vehicle component failures, including valve springs and a radiator, with notes on competitor parts. | 20th Feb 1934 | Box 173 \ 2 img178 | |
| Telegram message received by telephone from New York. | 8th Mar 1934 | Box 173 \ 2 img179 | |
| Telegram from Robotham requesting Derby's views on automobiles before cabling New York. | 8th Mar 1934 | Box 173 \ 2 img180 | |
| Night letter cable concerning competitor analysis of Cadillac, Terraplane, and LaSalle models. | 8th Mar 1934 | Box 173 \ 2 img181 | |
| Night letter cable discussing the importation of cars and related customs. | 8th Mar 1934 | Box 173 \ 2 img182 | |
| Procedure for dynamometer testing of a Terraplane engine, detailing the break-in process and performance evaluation. | 9th Feb 1934 | Box 173 \ 2 img183 | |
| Follow-up letter discussing the Allison engine's cooling system, with additional information from Wright Field on radiators and corrosion. | 22th Feb 1934 | Box 173 \ 2 img184 | |
| Notes on engine operating temperatures, battery ignition systems, and observations on new aircraft designs. | 22th Feb 1934 | Box 173 \ 2 img185 | |
| Diesel engines, fuel types, and Delco Remy starter motor performance. | 22th Feb 1934 | Box 173 \ 2 img186 | |
| Engine starting, flywheel gear reduction, and competitor analysis from Chevrolet, Buick, and Cadillac. | 22th Feb 1934 | Box 173 \ 2 img187 | |
| Starter mechanisms and dynamos, referencing Chevrolet and Bentley models. | 22th Feb 1934 | Box 173 \ 2 img188 | |
| High-speed dynamo performance, cooling methods, and potential mounting improvements. | 22th Feb 1934 | Box 173 \ 2 img189 | |
| Delco Remy's ignition coil studies and a proposed reciprocal exchange of parts with their chief engineer. | 22th Feb 1934 | Box 173 \ 2 img190 | |
| Memo detailing observations and features of a Warner Gear Co. overdrive gearbox. | 7th Mar 1934 | Box 173 \ 2 img191 | |
| Information received from the U.S.A. regarding the Allison engine and associated cooling technologies. | 7th Mar 1934 | Box 173 \ 2 img192 | |
| Battery ignition, aircraft designs, diesel engines, and engine starting procedures. | 7th Mar 1934 | Box 173 \ 2 img193 | |
| Technical report on competitor flywheel, starter motor, and dynamo designs from American car manufacturers. | 7th Mar 1934 | Box 173 \ 2 img194 | |
| Engine vibration, air cooling methods, and ignition system components. | 7th Mar 1934 | Box 173 \ 2 img195 | |
| The features of an over-speed gear from Warner Gear Co. | 7th Mar 1934 | Box 173 \ 2 img196 | |
| Letter on hotel stationery detailing car performance issues after a long drive in icy conditions. | 26th Feb 1934 | Box 173 \ 2 img197 | |
| Letter detailing a valve spring failure and subsequent breakdown during a journey from Buffalo. | 9th Mar 1934 | Box 173 \ 2 img198 | |
| Copy of a letter from the U.S.A. detailing driving issues in ice and snow, including broken valve springs. | 9th Mar 1934 | Box 173 \ 2 img199 | |
| Night letter cable requesting particulars of oil coolers used on the Conqueror engine. | 12th Mar 1934 | Box 173 \ 2 img200 | |
| Cablegram discussing the performance of a pancake cylinder head compared to other types. | 3rd Mar 1954 | Box 173 \ 2 img201 | |
| Summary of findings from Langley Field on single-cylinder engine tests regarding combustion chamber design and detonation. | 3rd Mar 1954 | Box 173 \ 2 img202 | |
| Petrol injection, diesel engine work, and comparative drag tests on cooling systems. | 3rd Mar 1954 | Box 173 \ 2 img203 | |
| Technical note comparing different aircraft engine nacelle setups, with additional details on hydraulic tappets, clutches, and engine dimensions. | 14th Feb 1934 | Box 173 \ 2 img204 | |
| Specification sheet for a Single Plate 12-CB Clutch as supplied to Lincoln. | 14th Feb 1934 | Box 173 \ 2 img205 | |
| Letter from Wilcox-Rich Corporation discussing issues with hydraulic lifters. | 20th Feb 1934 | Box 173 \ 2 img206 | |
| Single-cylinder engine work at Langley Field, discussing detonation and spark plugs on the Allison engine. | 12th Mar 1934 | Box 173 \ 2 img207 | |
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