| Description | Date | Identifier | |
| Page two of a letter regarding a jet adjustment. | 12th Aug 1936 | Box 150 \ 1 scan0176 | |
| Letter from Cleveland Petroleum Products regarding fuel performance and petrol pump diaphragm failures. | 13th Aug 1936 | Box 150 \ 1 scan0177 | |
| Engine fading issues possibly linked to the use of Ethyl petrol versus standard R-R petrol. | 28th Aug 1936 | Box 150 \ 1 scan0178 | |
| Letter from Ethyl Export Corporation regarding the examination of six 850 plugs suspected of causing misfiring. | 29th Aug 1936 | Box 150 \ 1 scan0179 | |
| Report and examination on six K.L.G.850 plugs removed from a Bentley car. | 28th Aug 1936 | Box 150 \ 1 scan0180 | |
| Chemical analysis of spark plug deposits and performance test results. | 28th Aug 1936 | Box 150 \ 1 scan0181 | |
| Conclusions from an investigation into engine misfiring, ruling out spark plugs and lead deposits as the cause. | 31th Aug 1936 | Box 150 \ 1 scan0182 | |
| Letter to The Ethyl Export Corporation regarding engine misfiring and pinking issues attributed to lead deposits from Ethyl fuel. | 31th Aug 1936 | Box 150 \ 1 scan0183 | |
| Cover page for an attached copy of a letter from a director. | 31th Aug 1936 | Box 150 \ 1 scan0184 | |
| Investigation into alleged trouble with sparking plugs due to the use of Ethyl petrol. | 31th Aug 1936 | Box 150 \ 1 scan0185 | |
| Acknowledgement of receipt concerning Ethyl Petrol. | 4th Sep 1936 | Box 150 \ 1 scan0186 | |
| Letter from Ethyl Export Corporation discussing spark plug issues, deposits from leaded fuel, and potential solutions. | 1st Sep 1936 | Box 150 \ 1 scan0187 | |
| Letter discussing sending engine plugs to Detroit for testing and suggesting alternative plug types. | 1st Sep 1936 | Box 150 \ 1 scan0188 | |
| Bentley chassis misfiring issues when using Ethyl fuel. | 7th Sep 1936 | Box 150 \ 1 scan0189 | |
| The investigation into engine misfiring when running with leaded ethyl petrol. | 7th Feb 1936 | Box 150 \ 1 scan0190 | |
| Electrical insulation and conductance tests of various plugs at different temperatures, considering lead deposits and material types. | 7th Sep 1936 | Box 150 \ 1 scan0191 | |
| Graph plotting leakage resistance versus temperature for a new KLG 850 A spark plug, showing performance during heating and cooling cycles. | 29th Aug 1936 | Box 150 \ 1 scan0192 | |
| Graph of leakage versus temperature during heating and cooling cycles for a plug after a 650-mile run. | 29th Aug 1936 | Box 150 \ 1 scan0193 | |
| Graph plotting leakage versus temperature for a KLG 850 A plug during heating and cooling cycles after a 650-mile run. | 29th Aug 1936 | Box 150 \ 1 scan0194 | |
| Graph plotting leakage in megohms versus temperature in degrees Celsius for a cleaned KLG 850A plug during repeated heating and cooling tests. | 23th Aug 1938 | Box 150 \ 1 scan0195 | |
| Graph plotting leakage against temperature for a K.L.G. V9/1 component with a heavy lead deposit. | 8th Aug 1936 | Box 150 \ 1 scan0196 | |
| Investigation into sparking plug trouble when using Ethyl petrol. | 7th Sep 1936 | Box 150 \ 1 scan0197 | |
| Petrol pump diaphragm failures when using Cleveland Discol fuel and renewing interest in it due to issues with Ethyl. | 19th Sep 1936 | Box 150 \ 1 scan0198 | |
| Letter from The S.U. Company Ltd. regarding the performance and testing of G.3 diaphragms with alcohol-based fuels. | 15th Sep 1936 | Box 150 \ 1 scan0199 | |
| Letter to Mr. Skinner discussing a leaking 'G' type diaphragm and the potential effects of 'Discol' fuel. | 17th Sep 1936 | Box 150 \ 1 scan0200 | |
| Conversation with Mr. Raymond Mays regarding his 4¼-Litre Bentley's performance with Discol fuel. | 17th Sep 1936 | Box 150 \ 1 scan0201 | |
| Letter to F.R. Banks of The Ethyl Export Corporation regarding the return of borrowed blueprints. | 22th Sep 1936 | Box 150 \ 1 scan0202 | |
| 12 misfiring sparking plugs from a Phantom III, car 34-EX, after running on 'Ethyl' fuel. | 25th Sep 1936 | Box 150 \ 1 scan0203 | |
| Dispatch of defective sparking plugs to The Ethyl Export Corporation for examination. | 28th Sep 1936 | Box 150 \ 1 scan0204 | |
| Letter to The Ethyl Export Corporation regarding defective plugs and complaints on the Phantom III. | 28th Sep 1936 | Box 150 \ 1 scan0205 | |
| Letter from Ethyl Export Corporation regarding an investigation into defective plugs and issues with leaded fuel. | 29th Sep 1936 | Box 150 \ 1 scan0206 | |
| Paper discussing a new high octane blending agent for modern aircraft engines. | 29th Sep 1936 | Box 150 \ 1 scan0207 | |
| High-octane aviation fuels, anti-knock compounds, and their application in aircraft engines. | 29th Sep 1936 | Box 150 \ 1 scan0208 | |
| Analysis of the physical characteristics and water tolerance of Isopropyl Ether as an aviation fuel. | 29th Sep 1936 | Box 150 \ 1 scan0209 | |
| Analysis of water solubility and ice separation in various aviation fuel blends at different temperatures. | 29th Sep 1936 | Box 150 \ 1 scan0210 | |
| The properties and testing of Isopropyl Ether blends in aviation fuels. | 29th Sep 1936 | Box 150 \ 1 scan0211 | |
| Technical analysis of Isopropyl Ether as a blending agent in aviation fuels, discussing its properties, economy, and availability. | 29th Sep 1936 | Box 150 \ 1 scan0212 | |
| The supply and performance testing of Isopropyl Ether and Iso-Octane as aviation fuel components. | 29th Sep 1936 | Box 150 \ 1 scan0213 | |
| Table of physical characteristics for the pure compounds Isopropyl Ether, Pure Iso-Octane, and Benzene. | 30th Jan 1936 | Box 150 \ 1 scan0214 | |
| Storage test results for aviation gasoline in a hot room at 100°F. | 30th Jan 1936 | Box 150 \ 1 scan0215 | |
| Table comparing the characteristics of various 100 octane aircraft engine fuels. | 30th Jan 1936 | Box 150 \ 1 scan0216 | |
| Table showing single-cylinder octane number data for blends in aviation gasoline. | 30th Jan 1936 | Box 150 \ 1 scan0217 | |
| Table of Single Cylinder Army Octane Numbers for blends of Isopropyl Ether and Technical Iso-octane in Knock Reference Fuel C-9. | 30th Jan 1936 | Box 150 \ 1 scan0218 | |
| Graph showing Cyclone engine performance trends over a 10-year period from 1925 to 1935. | 30th Jan 1936 | Box 150 \ 1 scan0219 | |
| Chart showing the variation in cylinder head temperature with fuel consumption and octane rating for two different engine models. | 30th Jan 1936 | Box 150 \ 1 scan0220 | |
| Graph showing the A.S.T.M. distillation curves for three different aviation gasolines. | 30th Jan 1936 | Box 150 \ 1 scan0221 | |
| Graph showing the A.S.T.M. distillation of 45% blends of mixed blending agents in typical aviation gasoline. | 30th Jan 1936 | Box 150 \ 1 scan0222 | |
| Graph showing the A.S.T.M. distillation curves for typical aviation gasoline and two different isopropyl ether blends. | 30th Jan 1936 | Box 150 \ 1 scan0223 | |
| Chart showing A.S.T.M. & Series 30 at 375°F ratings for clear and leaded blends of isopropyl ether in aviation gasoline. | 30th Jan 1936 | Box 150 \ 1 scan0224 | |
| Graph of A.S.T.M. & Series 30 ratings for Isopropyl Ether and Iso-Octane blends in aviation gasoline. | 30th Jan 1936 | Box 150 \ 1 scan0225 | |
| Graph showing lead requirements of aviation gasoline blends to achieve 100 Army Octane number. | 30th Jan 1936 | Box 150 \ 1 scan0226 | |
| Graph illustrating the octane number blending characteristics of Isopropyl Ether and Iso-Octane by the Army Method of Test. | 15th Oct 1936 | Box 150 \ 1 scan0227 | |
| Request to dispatch failed 10% chromium valves and an analysis of successful silchrome steel to the Ethyl Export Corporation. | 15th Oct 1936 | Box 150 \ 1 scan0228 | |
| Letter to The Ethyl Export Corporation regarding the testing of chromium and silchrome exhaust valves. | 15th Oct 1936 | Box 150 \ 1 scan0229 | |
| Request to dispatch failed 10% chromium valves and an analysis of successful silchrome steel to Mr. F.R. Banks of the Ethyl Export Corporation. | 15th Oct 1936 | Box 150 \ 1 scan0230 | |
| Letter from Ethyl Export Corporation regarding Bentley exhaust valves and sparking plug tests. | 16th Oct 1936 | Box 150 \ 1 scan0231 | |
| Letter to F.R. Banks of The Ethyl Export Corporation regarding the testing of special 10% chrome exhaust valves. | 22th Oct 1936 | Box 150 \ 1 scan0232 | |
| Material specification report, number 238B, detailing valve hardness after testing. | 22th Oct 1936 | Box 150 \ 1 scan0233 | |
| Letter from Ethyl Export Corporation acknowledging receipt of valve samples for laboratory examination. | 23th Oct 1936 | Box 150 \ 1 scan0234 | |
| Assessment of Aero Napet Fuel's suitability for use in cars, concluding it is unsuitable. | 30th Oct 1936 | Box 150 \ 1 scan0235 | |
| Letter discussing the confirmed effect of ethyl petrol on sparking plugs, particularly on cars used for short distances. | 3rd Nov 1936 | Box 150 \ 1 scan0236 | |
| Negative effects of Ethyl petrol on spark plugs, causing misfiring and customer complaints. | 30th Oct 1936 | Box 150 \ 1 scan0237 | |
| Misfiring issues caused by Ethyl petrol on sparking plugs and potential solutions for customers. | 4th Nov 1936 | Box 150 \ 1 scan0238 | |
| The continued use of Ethyl fuel despite potential misfiring issues in Bentley vehicles. | 4th Nov 1936 | Box 150 \ 1 scan0239 | |
| Attached letter concerning Cleveland Discol fuel. | 10th Nov 1936 | Box 150 \ 1 scan0240 | |
| Letter from Cleveland Petroleum Products Co. enquiring about the testing of Cleveland Discol. | 9th Nov 1936 | Box 150 \ 1 scan0241 | |
| Testing of Cleveland Discol Fuel on a car over a 12-month period due to a lack of prior experience. | 16th Dec 1935 | Box 150 \ 1 scan0242 | |
| Vehicle modifications for customers wishing to use Cleveland Discol fuel. | 14th Nov 1936 | Box 150 \ 1 scan0243 | |
| Quotation for Dichlorothylene. | 24th Nov 1936 | Box 150 \ 1 scan0244 | |
| Letter from Imperial Chemical Industries regarding an investigation into Dichlor-Ethylene and Ethylene products. | 4th Nov 1936 | Box 150 \ 1 scan0245 | |
| Quotation from Imperial Chemical Industries for the supply of Dichloroethylene. | 14th Nov 1936 | Box 150 \ 1 scan0246 | |
| Letter from Imperial Chemical Industries Ltd. concerning the price of drums and the availability of Dichloroethylene. | 14th Nov 1936 | Box 150 \ 1 scan0247 | |
| Letter to Imperial Chemical Industries discussing the suitability of Dichlorethylene and Trichlorethylene based on their freezing points. | 18th Nov 1936 | Box 150 \ 1 scan0248 | |
| Confirming instructions to run and record data on spark plugs during testing on Ethyl. | 26th Nov 1936 | Box 150 \ 1 scan0249 | |
| Mysterious car trouble due to plugs, linked to the use of Ethyl petrol, and suggesting a depot instruction sheet. | 23th Nov 1936 | Box 150 \ 1 scan0250 | |
| Technical memorandum discussing serious spark plug trouble, potentially linked to the use of ethyl fuel. | 26th Nov 1936 | Box 150 \ 1 scan0251 | |
| Letter from Ethyl Export Corporation clarifying issues with spark plug deposit build-up and discussing ceramic versus mica plug types. | 1st Dec 1936 | Box 150 \ 1 scan0252 | |
| Testing of additional plugs on Ethyl. | 8th Dec 1936 | Box 150 \ 1 scan0253 | |
| Follow-up memo regarding a delay in receiving an instruction sheet for Ethyl Fuel and Plug Trouble. | 11th Dec 1936 | Box 150 \ 1 scan0254 | |
| Confirming B.P. Ethyl fuel meets the required knock-rating standard for experimental work. | 11th Dec 1936 | Box 150 \ 1 scan0255 | |
| Letter from Ethyl Export Corporation regarding the properties and analysis of a new valve steel, Silchrome XCR. | 12th Dec 1936 | Box 150 \ 1 scan0256 | |
| Letter concerning a set of unstellited valves for Mr. A. T. Colwell of Thompson Products Inc. | 12th Dec 1936 | Box 150 \ 1 scan0257 | |
| Letter to Ethyl Export Corporation regarding Silchrome XCR steel for use as exhaust valves. | 16th Dec 1936 | Box 150 \ 1 scan0258 | |
| Letter to Ethyl Export Corporation regarding the use and acquisition of Silchrome XCR steel for exhaust valves. | 16th Dec 1936 | Box 150 \ 1 scan0259 | |
| Letter from Ethyl Export Corporation regarding a request for twelve Silchrome XCR valves and discussing the application of Stellite. | 17th Dec 1936 | Box 150 \ 1 scan0260 | |
| Letter from Ethyl Export Corporation concerning customer complaints about leaded fuel causing spark plug issues. | 8th Jan 1937 | Box 150 \ 1 scan0261 | |
| Letter to W.A. Robotham requesting a meeting to discuss the results of recent tests. | 8th Jan 1937 | Box 150 \ 1 scan0262 | |
| Letter from Ethyl Export Corporation to reschedule a visit and inquire about an injury. | 9th Jan 1937 | Box 150 \ 1 scan0263 | |
| Use of Ethyl lead fuel in Bentley cars and related petrol pump and sparking plug issues. | 9th Jan 1937 | Box 150 \ 1 scan0264 | |
| Recommendations for addressing carbon buildup and spark plug issues in a Bentley, including using specific fuel. | 9th Jan 1937 | Box 150 \ 1 scan0265 | |
| Use of ethyl lead fuel in Bentley cars and the issue of 'pinking'. | 8th Jan 1937 | Box 150 \ 1 scan0266 | |
| Letter from Ethyl Export Corporation quoting the material analysis of XCR from Thompson Products, Inc. for an order of 12 valves. | 12th Jan 1937 | Box 150 \ 1 scan0267 | |
| Letter from the Experimental Department regarding customer complaints about lead petrol and results from ceramic plugs. | 11th Jan 1937 | Box 150 \ 1 scan0268 | |
| Customer complaints regarding the use of ethyl lead fuel in Bentley cars and proposed solutions. | 12th Jan 1937 | Box 150 \ 1 scan0269 | |
| Engine pinking, the use of ethyl fuel, and the urgent need for a suitable spark plug to resolve the issue. | 12th Jan 1937 | Box 150 \ 1 scan0270 | |
| Summary of customer complaints regarding spark plug trouble caused by using ethyl lead fuel. | 14th Jan 1937 | Box 150 \ 1 scan0271 | |
| Issues related to Ethyl fuel and spark plugs in Bentley cars. | 14th Jan 1937 | Box 150 \ 1 scan0272 | |
| Letter from Ethyl Export Corporation regarding a dispute over the cause of engine trouble and a circular that blamed the lead content in petrol. | 18th Jan 1937 | Box 150 \ 1 scan0273 | |
| Letter to W.A. Robotham regarding the damaging effect of a circular. | 18th Jan 1937 | Box 150 \ 1 scan0274 | |
| Issues with spark plugs in Bentley cars due to ethyl lead fuel, and potential solutions. | 19th Jan 1937 | Box 150 \ 1 scan0275 | |
| | | | |
