| Description | Date | Identifier | |
| Summary of received cable messages from Detroit and Indianapolis. | 30th Jan 1934 | Box 173 \ 1 img142 | |
| Forwarding suggestions on independent wheel springing and feedback on the first 3 1/4 Litre Bentley. | 30th Jan 1934 | Box 173 \ 1 img143 | |
| Telegram from Robotham in Buffalo regarding a Bentley axle theory and cast iron tappets. | 28th Jan 1934 | Box 173 \ 1 img144 | |
| Night letter cable to Allison Engineering Co. regarding test success and the dispatch of bearings. | 31th Jan 1934 | Box 173 \ 1 img145 | |
| Cablegram reporting the results of testing Allison bearings with standard oil grooves. | 31th Jan 1934 | Box 173 \ 1 img146 | |
| Cable from the USA about the successful testing of Allison bearings. | 31th Jan 1934 | Box 173 \ 1 img147 | |
| Telegram querying the composition of a material for Allison bearings related to differing oil pressures. | 31th Jan 1914 | Box 173 \ 1 img148 | |
| Telegram message received by telephone. | 31th Jan 1914 | Box 173 \ 1 img149 | |
| Message recorded on a telegram received by telephone form. | 31th Jan 1934 | Box 173 \ 1 img150 | |
| Incomplete springing specification and noting the Vulture model needs stiffer rear springs. | 31th Jan 1934 | Box 173 \ 1 img151 | |
| Alterations to front suspension buffer clearances with measurements for laden and unladen states. | 31th Jan 1934 | Box 173 \ 1 img152 | |
| Table detailing the weights of front chassis components for various models. | 31th Jan 1934 | Box 173 \ 1 img153 | |
| Night letter cable to Detroit requesting impressions on a vehicle and comparison to Cadillacs. | 1st Feb 1934 | Box 173 \ 1 img154 | |
| Continuation document regarding Straight Eight and Vee Eight engines by Hives. | 1st Feb 1934 | Box 173 \ 1 img155 | |
| Telegram received by telephone confirming details of an official quote. | 30th Jan 1924 | Box 173 \ 1 img156 | |
| Cablegram from Robotham requesting car weight and dimensions for testing knee-action suspension. | 28th Jun 1930 | Box 173 \ 1 img157 | |
| Night letter cable concerning connecting rod bearing failures and a potential solution from Allisons. | 2nd Feb 1934 | Box 173 \ 1 img158 | |
| Record of a message received by telephone on a telegram form. | 2nd May 1934 | Box 173 \ 1 img159 | |
| Telegram received by telephone reporting a bearings failure after short flights at low revs. | 10th May 1933 | Box 173 \ 1 img160 | |
| Telegram message regarding the fitting of valve springs to fuel pressure relief valves. | 14th Feb 1941 | Box 173 \ 1 img161 | |
| Cablegram reporting on comparative bearing tests between Allison and Derby parts, noting failure points and proposing further tests. | 14th Feb 1941 | Box 173 \ 1 img162 | |
| Relaying a cable from the USA comparing the performance of Allison and Derby engine bearings. | 2nd Feb 1934 | Box 173 \ 1 img163 | |
| On Pratt & Whitney's progress with single and double-row radial engines, comparing them to Wright's. | 22th Jan 1933 | Box 173 \ 1 img164 | |
| Aircraft performance comparing gear reduction, speeds, retractable undercarriages and flaps. | 22th Jan 1933 | Box 173 \ 1 img165 | |
| The performance and issues of a prototype petrol injection engine, including temperature readings. | 22th Jan 1933 | Box 173 \ 1 img166 | |
| Notes on engine troubles, magnesium usage, oil cooling, and visitor restrictions for experimental engines. | 22th Jan 1933 | Box 173 \ 1 img167 | |
| Technical note with a diagram discussing oil-adjusted tappets, referencing a solution from Pierce Arrow to an air-in-oil problem. | 22th Jan 1933 | Box 173 \ 1 img168 | |
| On hydraulic plunger clearances and an analysis of Pierce engine efficiency compared to the Phantom engine. | 2nd Feb 1934 | Box 173 \ 1 img169 | |
| The general progress of Pratt & Whitney single and double row radial engines. | 2nd Feb 1934 | Box 173 \ 1 img170 | |
| Engine development, covering petrol injection, cylinder temperatures, operating issues, magnesium use, and oil cooling. | 2nd Feb 1934 | Box 173 \ 1 img171 | |
| Pierce Arrows' oil-adjusted tappets and a diagram of their bleed hole design. | 2nd Feb 1934 | Box 173 \ 1 img172 | |
| Analysis of Pierce engine efficiency, focusing on power output, crankshaft balancing, and camshaft drive. | 4th Feb 1934 | Box 173 \ 1 img173 | |
| Technical memorandum on the design of the Curtiss Conqueror engine, focusing on cylinder construction, supercharging, and starting systems. | 20th Jan 1934 | Box 173 \ 1 img174 | |
| Technical report on American aero-engine developments, including starter motors, gears, materials, and testing procedures. | 20th Jan 1934 | Box 173 \ 1 img175 | |
| Engine overhaul periods, experimental work at P&W, and a visit to Allison's factory regarding lead bronze bearings. | 20th Jan 1934 | Box 173 \ 1 img176 | |
| Technical report on a visit to the Stutz factory, detailing the specifications of a new liquid-cooled engine of Conqueror design. | 20th Jan 1934 | Box 173 \ 1 img177 | |
| Technical memo regarding ignition, valve gear, and bearing tests, with an appended handwritten note about a personal conversation. | 20th Jan 1934 | Box 173 \ 1 img178 | |
| Blueprint showing the arrangement of a gear assembly and its support structure. | 20th Jan 1934 | Box 173 \ 1 img179 | |
| Blueprint detailing an Allison reduction drive and external gear for a blower drive. | 20th Jan 1934 | Box 173 \ 1 img180 | |
| Blueprint diagram with annotations for the Curtis Conqueror cylinders. | 20th Jan 1934 | Box 173 \ 1 img181 | |
| Blueprint comparing a present and a proposed cylinder block design with handwritten annotations. | 20th Jan 1934 | Box 173 \ 1 img182 | |
| Design drawing for groove-less centre main bearings. | 20th Jan 1934 | Box 173 \ 1 img183 | |
| Hand-written suggestion for testing different centre bearing designs with varying lubrication holes. | 20th Jan 1934 | Box 173 \ 1 img184 | |
| Report comparing the current cylinder design with an alternative steel cylinder construction using hydrogen brazing. | 20th Jan 1934 | Box 173 \ 1 img185 | |
| Technical note on American engine developments, including superchargers, starters, reduction gears, and magnesium castings. | 20th Jan 1934 | Box 173 \ 1 img186 | |
| Engine components such as valves and bearings, materials used, overhaul periods, and experimental work. | 20th Jan 1934 | Box 173 \ 1 img187 | |
| Visit to Allison's in Indianapolis concerning the testing of lead bronze bearings and related engine components. | 20th Jan 1934 | Box 173 \ 1 img188 | |
| Specifications and design details for a liquid-cooled engine of Conqueror design. | 20th Jan 1934 | Box 173 \ 1 img189 | |
| Crankshaft material, ignition systems, valve gear, and a planned visit to US automotive plants. | 20th Jan 1934 | Box 173 \ 1 img190 | |
| Blueprint showing the design for grooveless centre main bearings. | 3rd Feb 1934 | Box 173 \ 1 img191 | |
| Suggestion for a centre bearing design with an external oil groove and a plain bore with multiple holes. | 3rd Feb 1934 | Box 173 \ 1 img192 | |
| Blueprint detailing the arrangement of a gear and bearing assembly. | 3rd Feb 1934 | Box 173 \ 1 img193 | |
| Design notes and a diagram for an Allison Reduction Gear and Blower Drive arrangement. | 3rd Feb 1934 | Box 173 \ 1 img194 | |
| Blueprint of the Curtis Conqueror cylinders with handwritten design notes. | 3rd Feb 1934 | Box 173 \ 1 img195 | |
| Blueprint comparing a present Condor block with a proposed separate cylinder design with a tubular steel skirt. | 3rd Feb 1934 | Box 173 \ 1 img196 | |
| Cross-sectional drawing illustrating a reduction gear arrangement with annotations. | 3rd Feb 1934 | Box 173 \ 1 img197 | |
| Hand-drawn schematic of a blower drive arrangement for an Allison engine. | 3rd Feb 1934 | Box 173 \ 1 img198 | |
| Hand-drawn schematic of the Curtis Conqueror engine cylinders. | 3rd Feb 1934 | Box 173 \ 1 img199 | |
| Comparison of present and proposed cylinder block and head construction. | 3rd Feb 1934 | Box 173 \ 1 img200 | |
| Drawing of a C. Roller Centre Main Bearing. | 3rd Feb 1934 | Box 173 \ 1 img201 | |
| Cross-section drawing of a centre bearing with handwritten notes suggesting design modifications. | 5th Feb 1934 | Box 173 \ 1 img202 | |
| Cablegram discussing improvements to Allison main bearings, conrod lubrication, and licensing. | 5th Feb 1934 | Box 173 \ 1 img203 | |
| Night-letter cable from Detroit regarding tests on Terraplane and Packard crankshafts. | 5th Feb 1934 | Box 173 \ 1 img204 | |
| Continuation of a Night-Letter Cable regarding glycol cooling and cylinder construction. | 5th Feb 1934 | Box 173 \ 1 img205 | |
| Telegram received by telephone concerning consumption tests and a financial claim. | 5th Feb 1934 | Box 173 \ 1 img206 | |
| Cablegram from Indianapolis to Derby regarding comparative tests on oil pressure. | 5th Feb 1934 | Box 173 \ 1 img207 | |
| Cablegram from Detroit comparing Straight Eight and Vee Eight engine characteristics. | 5th Feb 1934 | Box 173 \ 1 img208 | |
| Cablegram from Robotham detailing performance and teething troubles with clutches and steering, and a request for Spectre radiator matrix dimensions. | 5th Feb 1934 | Box 173 \ 1 img209 | |
| Cable discussing the relative advantages of straight-eight and vee-eight engines, referencing Cadillac's and La Salle's design choices. | 6th Feb 1934 | Box 173 \ 1 img210 | |
| Letter regarding repeated valve spring failures on a Bentley in Detroit and a Society of Automotive Engineers (S.A.E.) paper on 'Knee Action'. | 25th Jan 1934 | Box 173 \ 1 img211 | |
| Letter comparing vehicle suspension and ride quality with Cadillac's, and discussing a research trip to Detroit. | 5th Feb 1934 | Box 173 \ 1 img212 | |
| Report from the USA regarding valve spring failures on a Bentley and observations on American car suspension systems. | 5th Feb 1934 | Box 173 \ 1 img213 | |
| Bentley running issues, specifically low ground clearance in snow and valve spring failures. | 18th Nov 1934 | Box 173 \ 1 img214 | |
| Vehicle testing, detailing issues with the axle, brakes, and suspension under American conditions. | 5th Feb 1934 | Box 173 \ 1 img215 | |
| Various issues found while testing a Bentley, including ground clearance, valve springs, and axle problems. | 5th Feb 1934 | Box 173 \ 1 img216 | |
| Issues with the Vulture Silent Tappet mechanism and an unreliable plunger element at high speeds. | 5th Feb 1934 | Box 173 \ 1 img217 | |
| Visit to the Harrison Radiator Corporation in the U.S.A. | 6th Feb 1934 | Box 173 \ 1 img218 | |
| Wind tunnel equipment, oil cooler development, and radiator matrix efficiency improvements. | 6th Feb 1934 | Box 173 \ 1 img219 | |
| Harrison's radiator and oil cooler developments, including water passage strips and vibration tests. | 6th Feb 1934 | Box 173 \ 1 img220 | |
| The construction of a baffled tube oil cooler and analysis of engine heat to water. | 6th Feb 1934 | Box 173 \ 1 img221 | |
| Engine cooling systems, including series water flow, cylinder temperatures, and high-speed fan design. | 6th Feb 1934 | Box 173 \ 1 img222 | |
| Technical memorandum discussing various engine cooling system designs, including shutters and cowls. | 6th Feb 1934 | Box 173 \ 1 img223 | |
| Thermostat technology, engine cooling concepts, and chassis component management. | 6th Feb 1934 | Box 173 \ 1 img224 | |
| Visit to the Harrison Radiator Corp., detailing their research divisions and testing equipment. | 19th Jan 1934 | Box 173 \ 1 img225 | |
| Radiator core developments, comparing efficiencies and design modifications between different manufacturers. | 19th Jan 1934 | Box 173 \ 1 img226 | |
| Oil cooling systems, comparing existing designs and proposing a new manufacturing method for baffled tubes. | 19th Jan 1934 | Box 173 \ 1 img227 | |
| Technical memo discussing engine cooling systems, including oil coolers, heat transfer, water flow, and fans. | 19th Jan 1934 | Box 173 \ 1 img228 | |
| Technical report on automotive cooling system components including fan pulleys, shutters, cowls, and thermostats. | 19th Jan 1934 | Box 173 \ 1 img229 | |
| Report page discussing competitor technology from Buick and Cadillac, future engine concepts, and internal resource allocation. | 7th Feb 1934 | Box 173 \ 1 img230 | |
| Cablegram from Detroit regarding an eight-in-line crankshaft and engine mount. | 7th Feb 1934 | Box 173 \ 1 img231 | |
| Telegram received by telephone concerning crankshaft damping information. | 7th Feb 1924 | Box 173 \ 1 img232 | |
| Received cable communication with a distribution list. | 25th Jul 1934 | Box 173 \ 1 img233 | |
| Telegram reporting the satisfactory results of an Allison component test. | 8th Feb 1934 | Box 173 \ 1 img234 | |
| Telegram detailing additional bearing test conditions, including revolutions, duration, and maximum temperature. | 10th May 1937 | Box 173 \ 1 img235 | |
| Telegram received by telephone detailing a metal composition for bearings. | 14th Mar 1933 | Box 173 \ 1 img236 | |
| Cable received from RHC detailing the results of tests on Allison grooved bearings in the U.S.A. | 8th Feb 1934 | Box 173 \ 1 img237 | |
| Letter on Hotel Statler, Buffalo letterhead regarding a list, the repeal of prohibition and the weather. | 19th Jan 1934 | Box 173 \ 1 img238 | |
| Complaining that the sunshine roof on a 1BIV model causes a cold, and an anecdote about hitting a traffic signal. | 19th Jan 1934 | Box 173 \ 1 img239 | |
| The economic depression in America, G.M.'s spending, a report on Harrisons, and a slipping clutch. | 19th Jan 1934 | Box 173 \ 1 img240 | |
| Brake and clutch trouble due to traffic conditions. | 28th Jan 1934 | Box 173 \ 1 img241 | |
| | | | |
