| Description | Date | Identifier | |
| Use of leaded fuel in relation to producing a high-performance vehicle. | 19th Jan 1937 | Box 150 \ 1 scan0276 | |
| Investigating the causes of engine misfires in 25/30HP and Bentley cars. | 19th Jan 1937 | Box 150 \ 1 scan0277 | |
| Customer complaints of engine misfiring and spark plug issues in several chassis. | 12th Jan 1937 | Box 150 \ 1 scan0278 | |
| Correcting a report about customer issues with Ethyl lead fuel in Bentley cars. | 29th Jan 1937 | Box 150 \ 1 scan0279 | |
| Comparative tests for Bentley sparking plugs and fuel recommendations. | 29th Jan 1937 | Box 150 \ 1 scan0280 | |
| Results of tests on Bentley sparking plugs in comparison to other marques. | 30th Jan 1937 | Box 150 \ 1 scan0281 | |
| Customer complaints of misfiring and sparking plug issues in Bentley cars due to the use of Ethyl lead fuel. | 6th Feb 1937 | Box 150 \ 1 scan0282 | |
| Recommended mileage for decarbonisation on the Phantom III model. | 9th Feb 1937 | Box 150 \ 1 scan0283 | |
| Recommended mileage for engine decarbonisation and inspection of components like bearings and pistons. | 10th Feb 1937 | Box 150 \ 1 scan0284 | |
| Recommended mileage intervals for engine decarbonisation. | 15th Feb 1937 | Box 150 \ 1 scan0285 | |
| Letter from Shell-Mex House concerning an improvement to the anti-knock quality of their standard petrol. | 1st Mar 1937 | Box 150 \ 1 scan0286 | |
| Letter to Shell-Mex House regarding testing a new fuel from a local petrol pump. | 2nd Mar 1937 | Box 150 \ 1 scan0287 | |
| Confirming the receipt of 20 gallons of special shell petrol for testing. | 15th Mar 1937 | Box 150 \ 1 scan0288 | |
| The corrosive effects of leaded fuels on aluminium crankshaft caps and a suggestion to nickel plate them. | 25th Mar 1937 | Box 150 \ 1 scan0289 | |
| Minimal effect of leaded fuel on chassis units and concluding against the need for nickel coating. | 1st Apr 1937 | Box 150 \ 1 scan0290 | |
| Query regarding a new lead-free petrol from the Shell Group, claimed to have the qualities of Ethyl spirit. | 1st Apr 1937 | Box 150 \ 1 scan0291 | |
| The performance of a new shell fuel tested in a 4¼-litre Bentley, noting its inferiority regarding pinking. | 2nd Apr 1937 | Box 150 \ 1 scan0292 | |
| Letter from Ethyl Export Corporation to W. A. Robotham regarding spark plug problems and test results. | 26th Apr 1937 | Box 150 \ 1 scan0293 | |
| Letter to R. Banks of Ethyl Export Corporation arranging a meeting with Mr. Robotham. | 30th Apr 1937 | Box 150 \ 1 scan0294 | |
| Letter from Ethyl Export Corporation regarding the delivery of experimental Silchrome steel exhaust valves. | 21th Jun 1937 | Box 150 \ 1 scan0295 | |
| Letter to Ethyl Export Corporation regarding endurance testing of special XCR exhaust valves compared to standard KE.965 valves. | 23th Jun 1937 | Box 150 \ 1 scan0296 | |
| Letter to F.R. Banks of Ethyl Export Corporation regarding a booklet from the Glico people. | 25th Jun 1937 | Box 150 \ 1 scan0297 | |
| Letter from Ethyl Export Corporation discussing the contents and exaggerations within a booklet about fuel additives. | 28th Jun 1937 | Box 150 \ 1 scan0298 | |
| Summary of facts about Ethyl petrol produced by Redline-Glico, Ltd. | 12th Apr 1930 | Box 150 \ 1 scan0299 | |
| Reprint from The Lancet titled 'The Acquittal of Ethyl Petrol' alongside a foreword to a Q&A booklet on motor fuel. | 12th Apr 1930 | Box 150 \ 1 scan0300 | |
| Summary of facts about Ethyl Petrol, its properties, economy, and safety as determined by a Government Committee. | 12th Apr 1930 | Box 150 \ 1 scan0301 | |
| Frequently asked questions (FAQ) style document summarising the facts about Ethyl Petrol and its effect on engines. | 12th Apr 1930 | Box 150 \ 1 scan0302 | |
| Question and answer document summarizing the facts about Ethyl Petrol. | 12th Apr 1930 | Box 150 \ 1 scan0303 | |
| Question and answer summary regarding the properties and effects of Ethyl Petrol. | 12th Apr 1930 | Box 150 \ 1 scan0304 | |
| Question and answer document summarizing the facts about Ethyl Petrol. | 22th Jul 1937 | Box 150 \ 1 scan0305 | |
| Customer's query about recommended fuel for a 25/30 HP car abroad. | 22th Jul 1937 | Box 150 \ 1 scan0306 | |
| Follow-up request for a reply regarding fuel for the 25/30 HP model abroad. | 28th Jul 1937 | Box 150 \ 1 scan0307 | |
| Recommendation for the best fuel, 'Azure', for the 25/30 HP model when used abroad on the Continent. | 30th Jul 1937 | Box 150 \ 1 scan0308 | |
| Customer inquiry regarding the suitability of a specific brand of spirit fuel for their R.R. cars. | 7th Dec 1937 | Box 150 \ 1 scan0309 | |
| Letter responding to a customer query about the suitability of Regent Super No.1 petrol. | 10th Dec 1937 | Box 150 \ 1 scan0310 | |
| Cover letter from Ethyl Export Corporation regarding an attached copy of a previous letter. | 22th Dec 1937 | Box 150 \ 1 scan0311 | |
| Letter from Ethyl Export Corporation regarding a complaint about the company's negative stance on the use of Ethyl petrol. | 30th Jul 1937 | Box 150 \ 1 scan0312 | |
| Request to obtain 100 gallons of Discol petrol for use of experimental cars. | 4th Jan 1938 | Box 150 \ 1 scan0313 | |
| Pros and cons of Discol fuel compared to Ethyl fuel, leading to a recommendation for its use. | 30th Mar 1938 | Box 150 \ 1 scan0314 | |
| Comparison of the performance characteristics of Discol and Esso-Ethyl petrols. | 31th Jan 1938 | Box 150 \ 1 scan0315 | |
| Petrol level and carburetter needle modifications when using Discol fuel compared to Ethyl. | 2nd Feb 1938 | Box 150 \ 1 scan0316 | |
| Graph comparing the power and fuel consumption of Discol and Ethyl fuels at various RPMs, including valve timing specifications. | 2nd Feb 1938 | Box 150 \ 1 scan0317 | |
| Graph comparing the detonating qualities of Ethyl and Discol fuels with standard air and exhaust silencers fitted. | 2nd Feb 1938 | Box 150 \ 1 scan0318 | |
| Road test report comparing the performance of Discol and Ethyl petrols in a Bentley car. | 1st Apr 1938 | Box 150 \ 1 scan0319 | |
| Table comparing maximum ignition advance settings for Ethyl and Discol fuels to avoid detonation. | 1st Apr 1938 | Box 150 \ 1 scan0320 | |
| The use of 'Discol' fuel as an alternative to Ethyl leaded fuels. | 5th Apr 1938 | Box 150 \ 1 scan0321 | |
| Letter to R. Banks of Ethyl Export Corporation acknowledging receipt of a paper on Supercharging. | 8th Apr 1938 | Box 150 \ 1 scan0322 | |
| Letter from Ethyl Export Corporation regarding a paper on supercharging read at an SAE Meeting in Detroit. | 8th Apr 1938 | Box 150 \ 1 scan0323 | |
| Cover letter from Ethyl Export Corporation regarding an attachment for a previous report. | 11th Apr 1938 | Box 150 \ 1 scan0324 | |
| Paper on the fundamentals of supercharging, presented at a Society of Automotive Engineers meeting. | 28th Mar 1938 | Box 150 \ 1 scan0325 | |
| Ethyl Gasoline Corporation research program into engine performance using superchargers. | 28th Mar 1938 | Box 150 \ 1 scan0326 | |
| The influence of supercharging and compression ratio on engine performance metrics and temperatures. | 28th Mar 1938 | Box 150 \ 1 scan0327 | |
| Description of the operation of equipment used for fuel flow timing and air-fuel ratio control. | 28th Mar 1938 | Box 150 \ 1 scan0328 | |
| Analysis of engine test results focusing on gross power output, fuel economy, and manifold pressures under supercharged conditions. | 28th Mar 1938 | Box 150 \ 1 scan0329 | |
| Data table and analysis of engine intake manifold depression and total boost at various speeds and compression ratios. | 28th Mar 1938 | Box 150 \ 1 scan0330 | |
| Page detailing the formula for calculating the power charged to a supercharger, including definitions for all variables. | 28th Mar 1938 | Box 150 \ 1 scan0331 | |
| Analysis of blower power requirements, power output, and fuel consumption for supercharged engines with varying compression ratios. | 28th Mar 1938 | Box 150 \ 1 scan0332 | |
| Analysis of theoretical Otto air cycle efficiency, comparing supercharged and unsupercharged engine performance. | 28th Mar 1938 | Box 150 \ 1 scan0333 | |
| Page correlating actual test horsepower data with theoretical calculations, including a heat balance table for an unsupercharged engine. | 28th Mar 1938 | Box 150 \ 1 scan0334 | |
| Heat balance data for a supercharged engine at 5.55:1 and 4.25:1 compression ratios. | 28th Mar 1938 | Box 150 \ 1 scan0335 | |
| Table and analysis of power increase from supercharging an engine with a 5.55 to 1 compression ratio. | 28th Mar 1938 | Box 150 \ 1 scan0336 | |
| Page discussing the effects of supercharging on spark advance and exhaust gas/valve temperatures at different compression ratios. | 28th Mar 1938 | Box 150 \ 1 scan0337 | |
| Page discussing the results from engine tests at 1000 r.p.m., comparing theoretical and actual performance with supercharging. | 28th Mar 1938 | Box 150 \ 1 scan0338 | |
| Page detailing equations and theoretical calculations for engine power, work, and supercharging. | 28th Mar 1938 | Box 150 \ 1 scan0339 | |
| Theoretical analysis of 'complete' and 'normal' engine scavenging cycles with associated calculations. | 28th Mar 1938 | Box 150 \ 1 scan0340 | |
| Page detailing thermodynamic formulas for calculating work, charge, and scavenging in an engine cycle. | 28th Mar 1938 | Box 150 \ 1 scan0341 | |
| Analysis of engine performance with supercharging, comparing actual results to theoretical cycle calculations. | 28th Mar 1938 | Box 150 \ 1 scan0342 | |
| Analysis of supercharged engine performance, including power calculations, the effects of supercharging on exhaust gas temperature, and power air-fuel ratios. | 28th Mar 1938 | Box 150 \ 1 scan0343 | |
| Heat balance and the effect of supercharging on octane requirements at 1000 R.P.M. | 28th Mar 1938 | Box 150 \ 1 scan0344 | |
| Fuel octane requirements and the effects of supercharging on engine durability and spark plugs. | 28th Mar 1938 | Box 150 \ 1 scan0345 | |
| The performance and durability testing of various engine valves and bearings under different operating conditions. | 22th Apr 1938 | Box 150 \ 1 scan0346 | |
| Letter to F.R. Banks of Ethyl Export Corporation returning a paper on Supercharging. | 22th Apr 1938 | Box 150 \ 1 scan0347 | |
| The petrol stock in the experimental garage tanks for the week ending 23rd April 1938. | 25th Apr 1938 | Box 150 \ 1 scan0348 | |
| Letter from the Ethyl Export Corporation to W. A. Rowbotham arranging a visit to the Works. | 5th May 1938 | Box 150 \ 1 scan0349 | |
| Letter to the Ethyl Export Corporation requesting to borrow Buick cars for performance testing at Brooklands. | 6th May 1938 | Box 150 \ 1 scan0350 | |
| Letter from Ethyl Export Corporation regarding the performance and modification of a 1938 'Century' Buick. | 9th May 1938 | Box 150 \ 1 scan0351 | |
| Letter to R. Banks of Ethyl Export Corporation arranging a meeting at Brooklands. | 10th May 1938 | Box 150 \ 1 scan0352 | |
| Letter from the Ethyl Export Corporation confirming a meeting at Brooklands. | 13th May 1938 | Box 150 \ 1 scan0353 | |
| Typed message from Robotham to Banks confirming a meeting time at Brooklands. | 18th May 1938 | Box 150 \ 1 scan0354 | |
| Letter from Ethyl Export Corporation detailing performance figures for a modified Buick at Brooklands. | 27th May 1938 | Box 150 \ 1 scan0355 | |
| Letter to Shell-Mex and B.P. Ltd. regarding the use of fuels by the Production Test and Experimental Departments. | 20th Dec 1938 | Box 150 \ 1 scan0356 | |
| Letter from The Avon India Rubber Co. Ltd. acknowledging receipt of three washers, part number EW. 1666. | 2nd May 1938 | Box 150 \ 2 scan0001 | |
| Invoice for a corrugated suction hose and requesting a covering order be issued. | 6th May 1938 | Box 150 \ 2 scan0002 | |
| Letter from The Avon India Rubber Co. Ltd. discussing the manufacturing tolerances of rubber washers for a filler cap. | 4th May 1938 | Box 150 \ 2 scan0003 | |
| Letter from The Avon India Rubber Co. Ltd. returning an original drawing dated February 8th. | 4th May 1938 | Box 150 \ 2 scan0004 | |
| Letter to Rotherham & Sons Ltd. regarding the modification of drain taps to include nickel depositing and fitting with a drain pipe. | 4th May 1938 | Box 150 \ 2 scan0005 | |
| Letter to John Marston, Ltd. regarding a drawing for a modified yoke for a B.50 radiator and the forthcoming delivery of machined parts. | 9th May 1938 | Box 150 \ 2 scan0006 | |
| Letter to the Avon India Rubber Co. Ltd. regarding washer dimensions. | 9th May 1938 | Box 150 \ 2 scan0007 | |
| Letter from Serck Radiators Limited discussing an experimental radiator, enclosing a sketch and mentioning drawings for tanks. | 10th May 1938 | Box 150 \ 2 scan0008 | |
| Letter from Serck Radiators Limited estimating the price of a sample radiator at £35. | 10th May 1938 | Box 150 \ 2 scan0009 | |
| Letter from The Avon India Rubber Co. Ltd. regarding the manufacture of washers for a filler cap, part number EW.1666. | 11th May 1938 | Box 150 \ 2 scan0010 | |
| Letter to Serck Radiators Ltd. regarding the supply of a sample radiator matrix for testing. | 11th May 1938 | Box 150 \ 2 scan0011 | |
| Page 2 of a letter to Serck Radiators Ltd. thanking them for a works visit. | 11th May 1938 | Box 150 \ 2 scan0012 | |
| Order for Wraith production radiator filler parts for various experimental chassis. | 11th May 1938 | Box 150 \ 2 scan0013 | |
| Visits to radiator suppliers Serck Radiators Ltd. and John Marstons Ltd. | 12th May 1938 | Box 150 \ 2 scan0014 | |
| Discussions with supplier Marstons regarding the supply and modification of radiators and oil coolers. | 12th May 1938 | Box 150 \ 2 scan0015 | |
| Cooler orders, scrap charges, and the reconditioning of Mk.V matrices with supplier Messrs. Marston. | 12th May 1938 | Box 150 \ 2 scan0016 | |
| Design revisions and interchangeability of radiators for B.3 and B.50 models. | 12th May 1938 | Box 150 \ 2 scan0017 | |
| Revised radiator design for models B.3 and B.50. | 12th May 1938 | Box 150 \ 2 scan0018 | |
| Letter to a supplier requesting the manufacture of a curved hose connection, blueprint EB.3848, discussing potential quantities and tooling costs. | 13th May 1938 | Box 150 \ 2 scan0019 | |
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