| Description | Date | Identifier | |
| Letter discussing a Bentley car trial at Brooklands and seeking information about a new alcohol-blend motor fuel. | 3rd May 1933 | Box 27a \ 4 Scan108 | |
| Properties and performance of Koolmotor Alcohol Blend fuel, extracted from a letter by Cities Service Oil Company Ltd. | 5th May 1933 | Box 27a \ 4 Scan109 | |
| Letter extract discussing the supply of a product to Messrs. Montagu Burton Limited and the origins of its components. | 5th May 1933 | Box 27a \ 4 Scan110 | |
| Letter from Ethyl Export Corporation discussing the properties and knock rating of Koolmotor fuel. | 5th May 1933 | Box 27a \ 4 Scan111 | |
| Letter from Standard Oil Company of New Jersey regarding the availability of Hydrogenated Safety Fuel 'Safe-T-Esso'. | 7th May 1933 | Box 27a \ 4 Scan112 | |
| Properties, knock rating, and issues of Koolmotor alcohol blend fuel. | 8th May 1933 | Box 27a \ 4 Scan113 | |
| Further tests on Koolmotor Alcohol Blend fuel, including its octane value and hygroscopic action. | 17th May 1933 | Box 27a \ 4 Scan114 | |
| Letter from an oil company discussing the anti-knock value and pricing of their Koolmotor Alcohol Blend fuel. | 16th May 1933 | Box 27a \ 4 Scan115 | |
| Letter from Cities Service Oil Company regarding the stability of Koolmotor Alcohol Blend fuel. | 12th May 1933 | Box 27a \ 4 Scan116 | |
| Letter from Cities Service Oil Company Limited discussing favourable results from their alcohol fuel. | 12th May 1933 | Box 27a \ 4 Scan117 | |
| Aero engine fuel, arguing for a higher octane rating specification and criticising the freezing point limits. | 17th May 1933 | Box 27a \ 4 Scan118 | |
| Tests on Koolmotor Alcohol Blend fuel from the Cities Service Oil Company Ltd. | 17th May 1933 | Box 27a \ 4 Scan119 | |
| Letter from the Air Ministry regarding a draft specification for R.A.F. fuel and a related letter to suppliers. | 19th May 1933 | Box 27a \ 4 Scan120 | |
| Letter requesting information on maximum fuel octane values and T.E.L. additives for R.A.F. supply. | 19th May 1933 | Box 27a \ 4 Scan121 | |
| Letter to the Air Ministry concerning the ordering of Hydrogenated Fuel and a follow-up letter from the Standard Oil Company. | 23th May 1933 | Box 27a \ 4 Scan122 | |
| Letter from the Anglo-American Oil Company regarding an enquiry for non-inflammable high octane aviation fuel. | 23th May 1933 | Box 27a \ 4 Scan123 | |
| Letter to the Anglo American Oil Co. Ltd. requesting the octane number and price for 100 gallons of non-inflammable aviation fuel. | 26th May 1933 | Box 27a \ 4 Scan124 | |
| Letter from the Anglo-American Oil Company regarding the octane number and pricing of Safe-T-Esso fuel. | 27th May 1933 | Box 27a \ 4 Scan125 | |
| Letter to the Ethyl Export Corporation regarding correspondence about alcohol fuel and its 84 octane rating. | 29th May 1933 | Box 27a \ 4 Scan126 | |
| Letter from Ethyl Export Corporation regarding the inconsistent knock rating and octane numbers of Koolmotor Alcohol Blend fuel. | 30th May 1933 | Box 27a \ 4 Scan127 | |
| Letter discussing the effects of using Koolmotor Alcohol blend fuel in a car's fuel system. | 1st Jun 1933 | Box 27a \ 4 Scan128 | |
| Letter to The Secretary at Adastral House regarding the Octane Number of Safe-T-Esso fuel. | 1st Jun 1933 | Box 27a \ 4 Scan129 | |
| Letter from the Anglo-American Oil Company regarding the octane rating of Safe-T-Esso fuel. | 30th May 1933 | Box 27a \ 4 Scan130 | |
| The purchase of 100 gallons of Safe-T-Esso petrol. | 1st Jun 1933 | Box 27a \ 4 Scan131 | |
| Letter from Shell-Mex and B.P. Ltd discussing the required benzol addition to achieve an 80 Octane Number for D.T.D.134 fuel. | 2nd Jun 1933 | Box 27a \ 4 Scan132 | |
| The testing of Estonian fuel to determine the optimal mixture for engine performance. | 12th Jun 1933 | Box 27a \ 4 Scan133 | |
| Extract from a report concerning the quality and sampling of Belgian fuel for analysis. | 15th Jun 1933 | Box 27a \ 4 Scan134 | |
| Letter from Ethyl Export Corporation regarding fuel specifications, octane ratings, and valve head design for aero engines. | 16th Jun 1933 | Box 27a \ 4 Scan135 | |
| Page 2 of a letter discussing valve testing with stronger springs, different seat inserts, and leaded fuel. | 20th Jun 1933 | Box 27a \ 4 Scan136 | |
| Letter from Ethyl Export Corporation regarding the knock test results of a fuel sample taken from the Belgian Air Force. | 20th Jun 1933 | Box 27a \ 4 Scan137 | |
| The low octane rating of fuel used for Kestrel engines in Belgium following a sample test. | 21th Jun 1933 | Box 27a \ 4 Scan138 | |
| The correct fuel mixture for 'Kestrel' engines being used in Belgium. | 22th Jun 1933 | Box 27a \ 4 Scan139 | |
| Letter discussing a new fuel specification from the Air Ministry and the required Tetraethyl Lead to achieve various octane numbers. | 23th Jun 1933 | Box 27a \ 4 Scan140 | |
| Copy of a report from tester W. Jackson in Belgium regarding the lack of petrol octane testing facilities for the military. | 23th Jun 1933 | Box 27a \ 4 Scan141 | |
| Knock rating test results for Estonian shale benzine and subsequent engine testing requirements. | 27th Jun 1933 | Box 27a \ 4 Scan142 | |
| New French law requiring 16% alcohol in petrol and its reported effect of gumming up engine valves. | 4th Jul 1933 | Box 27a \ 4 Scan143 | |
| Issues with alcohol-blended petrol in France and the results of tests on Esso and Azur fuels. | 5th Jul 1933 | Box 27a \ 4 Scan144 | |
| Letter from the Experimental Department discussing Kestrel engine detonation tests in relation to jacket temperature and octane values. | 7th Jul 1933 | Box 27a \ 4 Scan145 | |
| Letter from Ethyl Export Corporation discussing fuel octane requirements for the Kestrel engine under specific test conditions. | 10th Jul 1933 | Box 27a \ 4 Scan146 | |
| Page two of a letter regarding a potential meeting to discuss valve samples. | 11th Jul 1933 | Box 27a \ 4 Scan147 | |
| Letter from the Air Ministry regarding the fuel specification for the Goshawk engine type test. | 11th Jul 1933 | Box 27a \ 4 Scan148 | |
| New fuel specifications for Goshawk engine tests following a joint A.R.C.-S.B.A.C. meeting. | 12th Jul 1933 | Box 27a \ 4 Scan149 | |
| Letter discussing alternative fuels and octane values for Goshawk engines. | 11th Jul 1933 | Box 27a \ 4 Scan150 | |
| Letter from The Bristol Aeroplane Company regarding higher octane fuel standards, including minimum octane values and lead content. | 13th Jul 1933 | Box 27a \ 4 Scan151 | |
| The second page of a typed letter signed by A.H.R. Fedden regarding the Air Ministry. | 13th Jul 1933 | Box 27a \ 4 Scan152 | |
| Letter to the Anglo-American Oil Co. Ltd. regarding specifications for two new fuels for the Air Services and an order for samples. | 13th Jul 1933 | Box 27a \ 4 Scan153 | |
| Letter specifying the knock ratings for non-leaded and leaded fuels. | 13th Jul 1933 | Box 27a \ 4 Scan154 | |
| Letter from Ethyl Export Corporation discussing the effect of mixture temperature on fuel octane number. | 13th Jul 1933 | Box 27a \ 4 Scan155 | |
| Order for two types of high-octane fuel from the Anglo American Oil Co. Ltd. | 14th Jul 1933 | Box 27a \ 4 Scan156 | |
| The purchase of 160 gallons of Methanol from I.C.I. Ltd. | 14th Jul 1933 | Box 27a \ 4 Scan157 | |
| Letter from the Anglo-American Oil Company regarding the despatch of Octane Fuel. | 15th Jul 1933 | Box 27a \ 4 Scan158 | |
| Letter from the Anglo American Oil Company regarding fuel octane numbers and a despatch of steel barrels. | 17th Jul 1933 | Box 27a \ 4 Scan159 | |
| Letter to Ethyl Export Corporation regarding the effects of Ethyl fuel on Magnesium components and the performance of Stellited valves. | 20th Jul 1935 | Box 27a \ 4 Scan160 | |
| Minutes of a conference on aero matters, discussing letters to the Air Ministry regarding regulations and fuel. | 20th Jul 1933 | Box 27a \ 4 Scan161 | |
| Letter to the Society of British Aircraft Constructors Ltd. regarding the need to update the Air Ministry's type test regulations for service engines. | 19th Jul 1933 | Box 27a \ 4 Scan162 | |
| Letter to the Air Ministry concerning the introduction of higher octane fuels for aircraft engines. | 17th Jul 1933 | Box 27a \ 4 Scan163 | |
| Letter from Ethyl Export Corporation concerning the effect of Ethyl on magnesium alloys and arranging a visit. | 21th Jul 1933 | Box 27a \ 4 Scan164 | |
| Letter to the Air Ministry regarding the corrosive effects of leaded petrol on Elektron magnesium alloy fuel tanks. | 20th Jul 1933 | Box 27a \ 4 Scan165 | |
| Page 2 of a letter discussing tests of 'leaded' petrol on magnesium alloy samples and enclosing two lab reports. | 28th Jun 1932 | Box 27a \ 4 Scan166 | |
| Report from the Ethyl Export Corporation on the effect of Ethyl Gasoline on Elektron Metal. | 28th Jun 1932 | Box 27a \ 4 Scan167 | |
| Experiments testing the effect of Ethyl Gasoline on Elektron metal used for aeroplane gasoline tanks. | 28th Jun 1932 | Box 27a \ 4 Scan168 | |
| Results and conclusions from a corrosion experiment on duralumin, aluminum, and Elektron metal using various fuels and water. | 28th Jun 1932 | Box 27a \ 4 Scan169 | |
| The corrosion resistance of chromate-coated Elektron metal when exposed to various fuels with and without water. | 21th Jul 1933 | Box 27a \ 4 Scan170 | |
| Fuel testing for the Belgian Government and silencers for 'Fox' or 'Firefly' aircraft. | 21th Jul 1933 | Box 27a \ 4 Scan171 | |
| Extracts concerning discussions with the Belgian Air Command about fuel quality and engine silencing. | 19th Jul 1933 | Box 27a \ 4 Scan172 | |
| Minutes from a technical conference discussing fuel knock ratings and the urgent need to type-test an engine with 87 octane fuel. | 24th Jul 1933 | Box 27a \ 4 Scan173 | |
| Letter from the Air Ministry regarding new fuel specifications for the Royal Air Force. | 22th Jul 1933 | Box 27a \ 4 Scan174 | |
| Cover note forwarding correspondence about a conference on fuel and Type Test regulations. | 24th Jul 1933 | Box 27a \ 4 Scan175 | |
| Letter to the Society of British Aircraft Constructors urging for updated and clear regulations from the Air Ministry for service engine type tests. | 19th Jul 1933 | Box 27a \ 4 Scan176 | |
| Letter to the Air Ministry regarding the introduction of new, higher octane aircraft fuels. | 17th Jul 1933 | Box 27a \ 4 Scan177 | |
| Letter from the Air Ministry regarding new fuel specifications for the Royal Air Force. | 22th Jul 1933 | Box 27a \ 4 Scan178 | |
| Letter from Ethyl Export Corporation discussing engine detonation and quoting German research papers. | 25th Jul 1933 | Box 27a \ 4 Scan179 | |
| Letter discussing jacket cooling improvements, fuel ratings, and a type test on 87 Octane Ethyl fuel. | 28th Jul 1933 | Box 27a \ 4 Scan180 | |
| Ordering two specific types of petrol for Goshawk engine tests. | 28th Jul 1933 | Box 27a \ 4 Scan181 | |
| From Hs. to Roy requesting an order for 500 gallons of Anglo American 77 Octane fuel. | 28th Jul 1933 | Box 27a \ 4 Scan182 | |
| The procurement of petrol for Goshawk and Kestrel engine type tests. | 28th Jul 1933 | Box 27a \ 4 Scan183 | |
| Order for 'T' Aviation Mix Ethyl Fluid from the Ethyl Export Corp. | 3rd Aug 1933 | Box 27a \ 4 Scan184 | |
| Internal office order to procure two types of octane fuel from the Anglo American Oil Company. | 4th Aug 1933 | Box 27a \ 4 Scan185 | |
| Confirming receipt of 12 cans of Aviation 'T' Mix Ethyl Fluid from the Ethyl Export Corporation. | 10th Aug 1935 | Box 27a \ 4 Scan186 | |
| Inquiry regarding dealings with the City's Service Oil Company about their 'Koolmotor' alcohol blend oil. | 15th Aug 1933 | Box 27a \ 4 Scan187 | |
| Letter regarding the failure of 14mm spark plugs when running with Ethyl petrol. | 23th Aug 1933 | Box 27a \ 4 Scan188 | |
| Two new fuel specifications, D.T.D. 224 and 230, and the associated instructions for testing and sampling. | 26th Aug 1933 | Box 27a \ 4 Scan189 | |
| From the Air Ministry regarding new standard fuel specifications for aircraft engines. | 8th Aug 1933 | Box 27a \ 4 Scan190 | |
| Fuel supply arrangements regarding knock rating certification and testing procedures. | 28th Aug 1933 | Box 27a \ 4 Scan191 | |
| The introduction of new standard fuels for aircraft engines and associated supply logistics. | 28th Aug 1933 | Box 27a \ 4 Scan192 | |
| Letter from Ethyl Export Corporation discussing issues with 14mm spark plugs when running on Ethyl petrol. | 29th Aug 1933 | Box 27a \ 4 Scan193 | |
| Technical drawing comparing an unmodified plug with a modified plug design to prevent overheating. | 4th Mar 1933 | Box 27a \ 4 Scan194 | |
| Attaching a laboratory report regarding fuel samples used on Fokker D.XVII and K.II.S. in Holland. | 31th Aug 1933 | Box 27a \ 4 Scan195 | |
| Laboratory report on fuel samples from a Fokker D XVII aircraft in Holland. | 29th Aug 1933 | Box 27a \ 4 Scan196 | |
| Order for 1000 gallons of D.T.D.230 fuel from the Anglo American Oil Co. Ltd. | 1st Sep 1933 | Box 27a \ 4 Scan197 | |
| Request for engine performance data regarding the effect of fuel anti-knock values on b.m.e.p. for a paper. | 4th Sep 1933 | Box 27a \ 4 Scan198 | |
| Letter page comparing the performance of Wright Co. and English air-cooled engines concerning octane fuel. | 7th Sep 1933 | Box 27a \ 4 Scan199 | |
| Letter from Ethyl Export Corporation requesting engine performance data with handwritten replies. | 7th Sep 1933 | Box 27a \ 4 Scan200 | |
| Letter from the Experimental Department providing car performance data for Bentley, 25 HP, and 40/50 models. | 8th Sep 1933 | Box 27a \ 4 Scan201 | |
| Letter concerning Air Ministry specifications for two new aero engine fuels, D.T.D.224 and D.T.D.230. | 7th Sep 1933 | Box 27a \ 4 Scan202 | |
| Letter from the Air Ministry concerning fuel specifications D.T.D.224 and D.T.D.230 for aero engines. | 4th Sep 1933 | Box 27a \ 4 Scan203 | |
| Engine development strategies in relation to different fuel octane ratings and specifications. | 4th Sep 1933 | Box 27a \ 4 Scan204 | |
| Specifications for fuel composition and usage during initial and development engine type tests. | 4th Sep 1933 | Box 27a \ 4 Scan205 | |
| Letter regarding experimental aero engine testing with higher T.E.L. fuel concentrations. | 11th Sep 1933 | Box 27a \ 4 Scan206 | |
| Letter to the Air Ministry regarding the testing of 50 gallons of Special Safety Fuel received from the U.S.A. | 11th Sep 1933 | Box 27a \ 4 Scan207 | |
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