| Description | Date | Identifier | |
| Letter to the Ethyl Export Corporation regarding the variation of compression ratio with different octane numbered fuels. | 13th Nov 1935 | Box 150 \ 1 scan0076 | |
| Letter regarding tests and guarantee issues with the 'Driscol Alcohol Blend' fuel from Cleveland Petroleum Products Co. | 13th Nov 1935 | Box 150 \ 1 scan0077 | |
| Letter from Cleveland Petroleum Products Co. regarding tests on their Cleveland Discot fuel. | 1st Oct 1935 | Box 150 \ 1 scan0078 | |
| Letter from Cleveland Petroleum Products Co. regarding the use of alcohol fuel in cars and its effect on the vehicle guarantee. | 11th Nov 1935 | Box 150 \ 1 scan0079 | |
| Suitability and guarantee implications of using Cleveland Discol alcohol blend fuel. | 14th Nov 1935 | Box 150 \ 1 scan0080 | |
| Brief note acknowledging interesting information regarding Cleveland Discol Alcohol Blend Fuel. | 15th Nov 1935 | Box 150 \ 1 scan0081 | |
| Corrosive effects of Cleveland Discol alcohol-blend fuel on various metals. | 21th Nov 1935 | Box 150 \ 1 scan0082 | |
| Company's recommendation on the use of Cleveland Discol fuel in their vehicles. | 23th Nov 1935 | Box 150 \ 1 scan0083 | |
| Letter from Ethyl Export Corporation detailing the octane ratings of two tested fuel samples. | 26th Nov 1935 | Box 150 \ 1 scan0084 | |
| Letter to The Ethyl Export Corporation discussing the octane values of Benzol mixtures versus Ethyl. | 28th Nov 1935 | Box 150 \ 1 scan0085 | |
| Letter from Ethyl Export Corporation discussing the relative octane values of benzol mixtures and Ethyl petrol. | 29th Nov 1935 | Box 150 \ 1 scan0086 | |
| Brief typed memo to W.A. Robotham regarding a matter with interesting results. | 29th Nov 1935 | Box 150 \ 1 scan0087 | |
| Performance curve sheet for a Skinner Motor slide valve engine test. | 28th Aug 1935 | Box 150 \ 1 scan0088 | |
| Potential recommendation of Cleveland Discol fuel and its associated gumming issues. | 10th Dec 1935 | Box 150 \ 1 scan0089 | |
| The corrosive effects of a product named 'Discol' on various metals. | 14th Oct 1935 | Box 150 \ 1 scan0090 | |
| Corrosive effects of 'Discol' fuel due to moisture absorption by its alcohol content. | 15th Oct 1935 | Box 150 \ 1 scan0091 | |
| The non-recommendation of Cleveland Discol fuel due to insufficient experience and plans for future testing. | 12th Dec 1935 | Box 150 \ 1 scan0092 | |
| The lack of experience with Cleveland Discol fuel and a proposal to test it for 12 months. | 16th Dec 1935 | Box 150 \ 1 scan0093 | |
| Telegraph arranging a lunch meeting and clarifying a mistake regarding a paper. | 3rd Jun 1938 | Box 150 \ 1 scan0094 | |
| Letter to The Ethyl Export Corporation requesting information on lead-treated exhaust pipes to prevent corrosion. | 4th Jan 1936 | Box 150 \ 1 scan0095 | |
| Letter from Ethyl Export Corporation discussing treatments for exhaust pipes to prevent corrosion from Ethyl gasoline. | 6th Jan 1936 | Box 150 \ 1 scan0096 | |
| Article on the application and testing of Calorized refinery pipe still tubes. | 28th Mar 1935 | Box 150 \ 1 scan0097 | |
| The properties and performance of Calorized steels under various test conditions including stress, temperature, and corrosion. | 28th Mar 1935 | Box 150 \ 1 scan0098 | |
| Article from The Oil and Gas Journal discussing the application, creep stress, and performance of Calorized steel tubes in refinery services. | 28th Mar 1935 | Box 150 \ 1 scan0099 | |
| Letter inquiring about materials for exhaust systems, discussing metallization, ethyl gasoline corrosion, and exhaust valves. | 7th Jan 1936 | Box 150 \ 1 scan0100 | |
| Letter from Ethyl Export Corporation discussing materials and processes like 'fescolizing' and chromium plating for engine exhaust systems. | 8th Jan 1936 | Box 150 \ 1 scan0101 | |
| Letter from Ethyl Export Corporation regarding the lead treatment of exhaust pipes on American automobiles. | 28th Feb 1936 | Box 150 \ 1 scan0102 | |
| Letter discussing the feasibility and history of lead treatment for the inside of exhaust pipes. | 19th Feb 1936 | Box 150 \ 1 scan0103 | |
| The second page of a typed letter from Julian J. Frey. | 30th Mar 1936 | Box 150 \ 1 scan0104 | |
| Letter from Ethyl Export Corporation regarding valve steel and bearing material tests for Bentley and Plymouth engines. | 30th Mar 1936 | Box 150 \ 1 scan0105 | |
| Letter to F.R. Banks of The Ethyl Export Corporation regarding a new bearing material. | 31th Mar 1936 | Box 150 \ 1 scan0106 | |
| Letter from Ethyl Export Corporation to W. A. Robotham regarding a missed meeting at a race track. | 30th Apr 1936 | Box 150 \ 1 scan0107 | |
| Confirmation of a telegram received regarding a meeting at Brooklands track. | 30th Apr 1936 | Box 150 \ 1 scan0108 | |
| Telegram to F.R. Banks of Ethyl Export Corp. arranging a meeting at Brooklands track. | 30th Apr 1936 | Box 150 \ 1 scan0109 | |
| Letter discussing Silcrome X valves with Stellite facing and the acquisition of a Rolls Bentley engine. | 4th May 1936 | Box 150 \ 1 scan0110 | |
| Query regarding whether the standardising spark plugs for PIII, 20/25 and big bore Bentley models are compatible with Ethyl fuel. | 21th May 1936 | Box 150 \ 1 scan0111 | |
| Use of Ethyl lead spirits versus Benzole mixtures in Bentley cars, considering issues like 'pinking' and effects on spark plugs. | 18th May 1936 | Box 150 \ 1 scan0112 | |
| Effects of Benzole mixtures and Ethyl petrol on Bentley cars. | 18th May 1936 | Box 150 \ 1 scan0113 | |
| Recommendation and use of Ethyl petrol in Bentley cars, including notes on sparking plugs and engine detonation. | 23th May 1936 | Box 150 \ 1 scan0114 | |
| Use of Ethyl petrol in specific car models and seeking confirmation of protection measures before stocking. | 2nd Jun 1936 | Box 150 \ 1 scan0115 | |
| Letter to F.R. Banks of The Ethyl Export Corporation regarding engine seat erosion issues and fuel mixtures. | 12th Jun 1936 | Box 150 \ 1 scan0116 | |
| Letter from the Ethyl Export Corporation regarding the absence of Mr. Banks. | 13th Jun 1936 | Box 150 \ 1 scan0117 | |
| Urgent request for 50 gallons of 'National Benzol Mixture' for high power Bentley development. | 15th Jun 1936 | Box 150 \ 1 scan0118 | |
| Engine pinking in trials cars, recommending the use of Ethyl fuel over Shell No.1 petrol. | 16th Jun 1936 | Box 150 \ 1 scan0119 | |
| To pass an order for 12 gallons of petrol. | 17th Jun 1936 | Box 150 \ 1 scan0120 | |
| Announcing the arrival of two papers on high octane and aircraft engine fuel from the U.S.A. | 17th Jun 1936 | Box 150 \ 1 scan0121 | |
| Clarifying the wording for the 4¼-litre Instruction Book regarding the use of Ethyl petrol. | 17th Jun 1936 | Box 150 \ 1 scan0122 | |
| The wording for the 4 1/4-litre instruction book. | 19th Jun 1936 | Box 150 \ 1 scan0123 | |
| Instruction book leaflet update regarding the use of ethyl petrol in the 4¼ Litre Bentley. | 18th Jun 1936 | Box 150 \ 1 scan0124 | |
| Letter from Ethyl Export Corporation discussing valve seat insert materials and fitting methods for engines. | 29th Jun 1936 | Box 150 \ 1 scan0125 | |
| Letter to W. A. Robotham discussing fuel performance, engine inserts for the Bentley, and arranging a meeting. | 29th Jun 1936 | Box 150 \ 1 scan0126 | |
| Suitability of Ethyl petrol for their engines, especially the Bentley. | 29th Jun 1936 | Box 150 \ 1 scan0127 | |
| Use of Ethyl petrol, its effects on spark plugs, and when to recommend its use for different chassis, including Bentley. | 1st Jul 1936 | Box 150 \ 1 scan0128 | |
| Confusion and clarifying the use of Ethyl fuel in specific car models. | 1st Jul 1936 | Box 150 \ 1 scan0129 | |
| The circulation of information to depots about the use of Ethyl Petrol. | 3rd Jul 1936 | Box 150 \ 1 scan0130 | |
| Ethyl Petrol, referencing previous correspondence and a Depot Sheet. | 3rd Jul 1936 | Box 150 \ 1 scan0131 | |
| Technical sheet regarding the use of Ethyl (leaded) petrol in Bentley, 25/30, and Phantom III models. | 3rd Jul 1936 | Box 150 \ 1 scan0132 | |
| The suitability of Bentley models for Ethyl petrol. | 3rd Jul 1936 | Box 150 \ 1 scan0133 | |
| Necessity of using Ethyl fuel based on vehicle mileage below 10,000 miles. | 6th Jul 1936 | Box 150 \ 1 scan0134 | |
| Night letter cablegram regarding severe misfiring with mica plugs on leaded fuel. | 9th Jul 1936 | Box 150 \ 1 scan0135 | |
| The historical use of Ethyl petrol brands in France since 1928, predating their use in Bentley cars. | 9th Jul 1936 | Box 150 \ 1 scan0136 | |
| Letter from the Ethyl Export Corporation regarding issues with mica spark plugs and a request for samples. | 15th Jul 1936 | Box 150 \ 1 scan0137 | |
| Troubleshooting Mica plug issues with help from the Ethyl Export Corporation. | 16th Jul 1936 | Box 150 \ 1 scan0138 | |
| Letter from Shell-Mex requesting approval for extreme pressure lubricants and 'Ethyl' petrol, and to arrange a meeting. | 24th Jul 1936 | Box 150 \ 1 scan0139 | |
| Letter to L.G. Callingham of Shell-Mex House regarding the postponement of a meeting. | 25th Jul 1936 | Box 150 \ 1 scan0140 | |
| Letter from Shell-Mex House to E. W. Hives arranging a meeting after August 10th. | 27th Jul 1936 | Box 150 \ 1 scan0141 | |
| Seeking clarification on whether Depot Sheet No. 306 covers ethyl-lead-alcohol petrol blends. | 27th Jul 1936 | Box 150 \ 1 scan0142 | |
| Quality and composition of various petrol grades available in France, including ethyl-lead spirits. | 25th Jul 1936 | Box 150 \ 1 scan0143 | |
| Seeking clarification if Depot Sheet No. 306 covers ethyl-lead-alcohol petrol blends available on the Continent. | 27th Jul 1936 | Box 150 \ 1 scan0144 | |
| Letter discussing the composition and quality of various petrols available in France. | 25th Jul 1936 | Box 150 \ 1 scan0145 | |
| Letter from Cleveland Petroleum Products regarding tests of their Discol fuel in a Bentley car and a new blend for the Ulster T.T. Race. | 29th Jul 1936 | Box 150 \ 1 scan0146 | |
| Letter to F. R. Banks of The Ethyl Export Corporation regarding a report on aircraft engines and a query about automobile work. | 29th Jul 1936 | Box 150 \ 1 scan0147 | |
| Letter from Woodford Motor Co. requesting advice on the suitability of Discol petrol for a 4 1/4 litre Rolls-Bentley. | 28th Jul 1936 | Box 150 \ 1 scan0148 | |
| Letter to The Ethyl Export Corporation with a questionnaire regarding misfiring issues on K.L.G. 850 plugs used with Ethyl fuel. | 28th Jul 1936 | Box 150 \ 1 scan0149 | |
| Page 2 of a letter asking a question about depositing lead oxide on spark plug electrodes. | 29th Jul 1936 | Box 150 \ 1 scan0150 | |
| Letter from Ethyl Export Corporation discussing sparking plug issues and recommendations. | 29th Jul 1936 | Box 150 \ 1 scan0151 | |
| Letter offering B.G. plugs for an engine and arranging a visit to Derby. | 29th Jul 1936 | Box 150 \ 1 scan0152 | |
| Letter responding to an inquiry about the suitability of Cleveland Discol petrol for a 4 1/4 litre Bentley. | 30th Jul 1936 | Box 150 \ 1 scan0153 | |
| Letter from Ethyl Export Corporation regarding the American motor car situation, including radiators, spark plugs, and overdrives. | 30th Jul 1936 | Box 150 \ 1 scan0154 | |
| Engine oil performance, bearings, tappets, and other automotive components. | 30th Jul 1936 | Box 150 \ 1 scan0155 | |
| Letter discussing enclosed reports, the Bentley spark plug situation, and arranging a meeting. | 30th Jul 1936 | Box 150 \ 1 scan0156 | |
| Letter from Ethyl Export Corporation enclosing photostats of tests on a supercharged Buick engine. | 31th Jul 1936 | Box 150 \ 1 scan0157 | |
| Graph showing the relationship between exhaust valve/gas temperatures and engine speed under different compression ratios. | 11th Jun 1936 | Box 150 \ 1 scan0158 | |
| Performance graph showing the effect of supercharging on power and brake mean effective pressure for a Buick 40-1936 engine. | 11th Jun 1936 | Box 150 \ 1 scan0159 | |
| Proposal to amend Depot Sheet No. 306 regarding the recommended use of leaded petrols on the continent. | 4th Aug 1936 | Box 150 \ 1 scan0160 | |
| Letter to The Cleveland Petroleum Products Co. Ltd. declining to undertake work on a new fuel. | 6th Aug 1936 | Box 150 \ 1 scan0161 | |
| Letter concerning a paper on valves and seatings, and the fuel used in the French Grand Prix. | 6th Aug 1936 | Box 150 \ 1 scan0162 | |
| Fuel sensitivity and engine knock tests conducted on a 3 1/2 Litre Bentley car at Brooklands. | 6th Aug 1936 | Box 150 \ 1 scan0163 | |
| Results of engine knock tests and vehicle performance measurements. | 6th Aug 1936 | Box 150 \ 1 scan0164 | |
| Conclusions report on an engine performance test regarding fuel types, spark plugs, and engine knock. | 7th Aug 1936 | Box 150 \ 1 scan0165 | |
| The use of leaded and alcohol petrol mixtures available on the continent. | 7th Aug 1936 | Box 150 \ 1 scan0166 | |
| Letter from Shell-Mex detailing the results of performance tests on a 3 1/2 litre Bentley at Brooklands. | 7th Aug 1936 | Box 150 \ 1 scan0167 | |
| The concluding page of a letter arranging a future meeting with Mr. Todd. | 7th Aug 1936 | Box 150 \ 1 scan0168 | |
| Letter to Ethyl Export Corporation regarding the laboratory examination of K.L.G. sparking plugs removed from a Bentley chassis due to misfiring. | 7th Aug 1936 | Box 150 \ 1 scan0169 | |
| Arranging the dispatch of used and new K.L.G. type 850 sparking plugs on loan to The Ethyl Export Corporation for laboratory examination. | 7th Aug 1936 | Box 150 \ 1 scan0170 | |
| Letter of appreciation from Ethyl Export Corporation for the loan of a 4 1/4 litre Bentley. | 10th Aug 1936 | Box 150 \ 1 scan0171 | |
| Letter from Cleveland-Petroleum Products Co. concerning the use of their 'Discol' petrol blend in a new Bentley. | 11th Aug 1936 | Box 150 \ 1 scan0172 | |
| Letter from Cleveland Petroleum Products Company regarding the performance of their 'Discol' alcohol blend fuel and its suitability for Bentley cars. | 11th Aug 1936 | Box 150 \ 1 scan0173 | |
| Thank you letter to Mr. Bevan of Ethyl Export Corporation regarding his run on a 4 1/4 Litre Bentley. | 11th Aug 1936 | Box 150 \ 1 scan0174 | |
| Letter to Cleveland Petroleum Products Co. providing observations on their Discol fuel, comparing it with Ethyl and discussing tests on a Bentley. | 12th Aug 1936 | Box 150 \ 1 scan0175 | |
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