| Description | Date | Identifier | |
| Seeking advice on casting an iron washer within an aluminium water pump casing. | 20th Dec 1940 | Box 149a \ 3 scan0278 | |
| Letter to The Morgan Crucible Co. Ltd. requesting the manufacture of a small quantity of a carbon gland ring and a rubber sealing washer for experimental purposes. | 31th Dec 1940 | Box 149a \ 3 scan0279 | |
| Production request for springs and spring rings for the B.60 and B.80 water pump. | 4th Jan 1941 | Box 149a \ 3 scan0280 | |
| To the Pattern Shop requesting the creation of a new water pump pattern and the modification of an existing one. | 3rd Jan 1941 | Box 149a \ 3 scan0281 | |
| Letter from The Hoffmann Manufacturing Co. Ltd. confirming a despatch date for an order of bearings. | 11th Dec 1940 | Box 149a \ 3 scan0282 | |
| Sending advanced blueprints for a B.60 & 80 Water Pump casing. | 14th Dec 1940 | Box 149a \ 3 scan0283 | |
| Letter from Delco-Remy & Hyatt Ltd. about the availability of Fan and Pump Shaft Bearings. | 17th Dec 1940 | Box 149a \ 3 scan0284 | |
| Urgent and secret request for rotor, gland, and bearing assemblies for an undisclosed job. | 13th Jan 1941 | Box 149a \ 3 scan0285 | |
| Internal request to place an order for Carbon Gland Rings from The Morgan Crucible Co. Ltd. | 16th Jan 1941 | Box 149a \ 3 scan0286 | |
| Letter to The Morgan Crucible Co. Ltd. regarding the machining of carbon rings and interest in a new type of gland. | 16th Jan 1941 | Box 149a \ 3 scan0287 | |
| Order acknowledgement from Delco-Remy & Hyatt Ltd for Fan & Pump Shafting Bearing Assemblies. | 26th Dec 1940 | Box 149a \ 3 scan0288 | |
| Letter from The Morgan Crucible Company concerning the supply and development of water pump components. | 13th Jan 1941 | Box 149a \ 3 scan0289 | |
| Drawing of a Morgan Stuart patent gland assembly for automobile pumps with material specifications and dimensional data. | 4th Aug 1940 | Box 149a \ 3 scan0290 | |
| Specification sheet for a Morgan Stuart patent gland assembly, detailing arrangements, material properties, and dimensional data. | 1st Jan 1940 | Box 149a \ 3 scan0291 | |
| Design and casting modification of a car coolant pump, which is a copy of a Buick pump. | 29th Jan 1941 | Box 149a \ 3 scan0292 | |
| Letter from Abbey Engineering requesting an official order for machined pump impellers. | 6th Feb 1941 | Box 149a \ 3 scan0293 | |
| Telegram advising a revised promise date for order number 39138, addressed to Mr. Robotham. | 10th Feb 1941 | Box 149a \ 3 scan0294 | |
| Letter from The Morgan Crucible Company Ltd. confirming a wired message about a delivery date for Part No.RE 2020. | 10th Feb 1941 | Box 149a \ 3 scan0295 | |
| Letter chasing an urgent, overdue order for carbon gland rings from The Morgan Crucible Co., Ltd. | 27th Feb 1941 | Box 149a \ 3 scan0296 | |
| Blueprints for a mould for a rubber seal for a Buick type water pump. | 28th Feb 1941 | Box 149a \ 3 scan0297 | |
| Proposed program of tests for a coolant pump rig, comparing original, improved, and Buick type pumps. | 14th Mar 1941 | Box 149a \ 3 scan0298 | |
| Proposed program of endurance tests for a coolant pump rig. | 14th Mar 1941 | Box 149a \ 3 scan0299 | |
| The dispatch of blueprints for fan pulley drawings related to a Water Pump Test Rig. | 20th Mar 1941 | Box 149a \ 3 scan0300 | |
| Recommending the Buick-type PL.433 water pump for B.60 and B.80 engines based on its proven reliability. | 23th Nov 1943 | Box 149a \ 3 scan0301 | |
| Four types of water pumps for car engines and carriers, with a postscript about a new type of seal. | 23th Nov 1943 | Box 149a \ 3 scan0302 | |
| Requesting an order for a 50 gallon drum of Discol Petrol for a Bentley Unit Test. | 16th Jan 1935 | Box 150 \ 1 scan0001 | |
| Follow-up letter from Cleveland Petroleum Products regarding the testing of their motor spirit on Bentley cars. | 17th Jan 1935 | Box 150 \ 1 scan0002 | |
| Letter to the Ethyl Export Corporation regarding engine issues caused by aged Ethyl petrol assuming a gummy form. | 30th Mar 1935 | Box 150 \ 1 scan0003 | |
| Letter concerning gummy deposits in a carburetter possibly caused by the storage of Ethyl petrol. | 1st Apr 1935 | Box 150 \ 1 scan0004 | |
| Letter confirming a meeting to show valves, carburetter parts, and figures for racing fuels. | 3rd Apr 1935 | Box 150 \ 1 scan0005 | |
| Short typed message recommending a visit to Hucknall over Tollerton. | 8th Apr 1935 | Box 150 \ 1 scan0006 | |
| Post Office telegram confirming an arrival time at Hucknall. | 9th Apr 1935 | Box 150 \ 1 scan0007 | |
| Letter from Ethyl Export Corporation regarding the testing of Esso Ethyl fuel and its anti-knock properties. | 11th Apr 1935 | Box 150 \ 1 scan0008 | |
| Letter from Ethyl Export Corporation to W. A. Robotham of the Experimental Department. | 15th Apr 1935 | Box 150 \ 1 scan0009 | |
| Technical paper on the relationship between fuel octane and engine compression ratio, with handwritten notes regarding a piston seizure test. | 15th Apr 1935 | Box 150 \ 1 scan0010 | |
| American passenger car engine design trends since 1925, focusing on compression ratios, anti-knock improvements, and the relationship with fuel octane numbers. | 15th Apr 1935 | Box 150 \ 1 scan0011 | |
| The relationship between engine parameters like ignition timing, compression ratio, cylinder size, and materials on fuel octane requirements and performance. | 15th Apr 1935 | Box 150 \ 1 scan0012 | |
| Diagrams of modified and original exhaust valves, alongside graphs illustrating the relationship between fuel octane, torque, and engine variables. | 15th Apr 1935 | Box 150 \ 1 scan0013 | |
| Effects of jacket temperature, air-fuel ratio, and engine design on fuel octane requirements and performance. | 15th Apr 1935 | Box 150 \ 1 scan0014 | |
| Study on the relationship between fuel octane number, engine design parameters, and engine knock, with supporting graphs. | 29th Apr 1935 | Box 150 \ 1 scan0015 | |
| Short typed letter to F.R. Banks of Ethyl Export Corporation acknowledging receipt of a letter and an interesting paper. | 29th Apr 1935 | Box 150 \ 1 scan0016 | |
| Letter to the Ethyl Export Corporation regarding a customer's bearing failure due to lead bromide corrosion in the crankshaft. | 14th May 1935 | Box 150 \ 1 scan0017 | |
| Letter from Ethyl Export Corporation acknowledging receipt of a previous letter. | 15th May 1935 | Box 150 \ 1 scan0018 | |
| Letter from the Ethyl Export Corporation to E. W. Hives arranging a visit to Derby. | 11th Jun 1935 | Box 150 \ 1 scan0019 | |
| Letter from Ethyl Export Corporation regarding a Bentley crank pin trouble. | 26th Jun 1935 | Box 150 \ 1 scan0020 | |
| Letter to the Ethyl Export Corporation regarding issues with crankshaft lubricant and air intake. | 9th Jul 1935 | Box 150 \ 1 scan0021 | |
| Letter from Ethyl Export Corporation regarding trouble with crankshaft oilers and the potential role of Ethyl fuels. | 11th Jul 1935 | Box 150 \ 1 scan0022 | |
| Letter from Ethyl Export Corporation concerning the condition of a Cadillac V-16 exhaust valve after tests. | 16th Jul 1935 | Box 150 \ 1 scan0023 | |
| The procurement and testing of high-octane fuel (Iso Octane). | 18th Jul 1935 | Box 150 \ 1 scan0024 | |
| Letter from Ethyl Export Corporation regarding laboratory reports on oil samples and corroded plugs. | 22th Jul 1935 | Box 150 \ 1 scan0025 | |
| Laboratory report on oil and sludge samples from a Bentley, investigating the cause of aluminium plug corrosion. | 19th Jul 1935 | Box 150 \ 1 scan0026 | |
| Analysis report of oil and sludge samples received from the Ethyl Export Corporation. | 18th Jul 1935 | Box 150 \ 1 scan0027 | |
| Analysis report detailing the chemical composition of sludge sample number 16628. | 18th Jul 1935 | Box 150 \ 1 scan0028 | |
| Analysis of lead and bromide deposits, discussing potential causes related to ethyl gasoline and blended lubricating oils. | 24th Jul 1935 | Box 150 \ 1 scan0029 | |
| Letter regarding a badly pulled exhaust valve from an experimental Bentley and a crankshaft order. | 24th Jul 1935 | Box 150 \ 1 scan0030 | |
| Letter from Ethyl Export Corporation regarding issues with Bentley exhaust valves and the K.E.965 variety. | 27th Jul 1935 | Box 150 \ 1 scan0031 | |
| Letter from Ethyl Export Corporation discussing crank pin oiler troubles and the use of stainless steel. | 29th Jul 1935 | Box 150 \ 1 scan0032 | |
| Letter from Ethyl Export Corporation regarding crank pin oiler troubles and suggesting anodic treatment. | 9th Aug 1935 | Box 150 \ 1 scan0033 | |
| Extract from a letter by S. D. Heron discussing the corrosion of crank pin plugs on a Bentley car and suggesting modifications. | 1st Aug 1935 | Box 150 \ 1 scan0034 | |
| Request to obtain a 50-gallon barrel of Swan Petrol (680) for tests on Bentley and Spectre petrol systems. | 19th Aug 1935 | Box 150 \ 1 scan0035 | |
| Letter from Ethyl Export Corporation regarding a Cadillac valve and Sam Heron's remarks on British lubricating oil. | 22th Aug 1935 | Box 150 \ 1 scan0036 | |
| Letter from Ethyl Export Corporation discussing the condition and material composition of Cadillac V-16 engine valves. | 3rd Jun 1935 | Box 150 \ 1 scan0037 | |
| Corrosion on aero engines due to Ethyl Lead and water, proposing nickel plating as a solution. | 30th Aug 1935 | Box 150 \ 1 scan0038 | |
| French chemical fuel additive 'L'Anthène', its performance compared to T.E.L., and its use in racing engines. | 12th Aug 1935 | Box 150 \ 1 scan0039 | |
| Receipt of 100 octane fuel and the subsequent requirement for new pistons and cylinder heads for testing. | 21th Aug 1935 | Box 150 \ 1 scan0040 | |
| Authorising the purchase of a special high knock rating fuel from the Anglo American Oil Co. Ltd. for experimental purposes. | 22th Aug 1935 | Box 150 \ 1 scan0041 | |
| Letter from Anglo-American Oil Co. Ltd. providing a specification and price for 100 Octane fuel. | 21th Aug 1935 | Box 150 \ 1 scan0042 | |
| Specifications of a high knock rating fuel blended with iso-octane. | 22th Aug 1935 | Box 150 \ 1 scan0043 | |
| Specification sheet for '100 Octane' fuel, comparing its properties against the D.T.D.230 standard. | 22th Aug 1935 | Box 150 \ 1 scan0044 | |
| Request for information regarding experience with leaded fuel in engines prior to the Kestrel V-X series. | 29th Aug 1935 | Box 150 \ 1 scan0045 | |
| Letter inquiring about the availability and octane rating of fuels in continental Europe for a high compression engine. | 3rd Sep 1935 | Box 150 \ 1 scan0046 | |
| Letter from the Ethyl Export Corporation regarding the octane ratings of fuels across Europe. | 4th Sep 1935 | Box 150 \ 1 scan0047 | |
| Test of a Spectre & Bentley on the Stelvio, related to petrol quality on the Continent. | 5th Sep 1935 | Box 150 \ 1 scan0048 | |
| Letter from Ethyl Export Corporation regarding fuel octane ratings and the lifting of the ban on lead in France. | 9th Sep 1935 | Box 150 \ 1 scan0049 | |
| High compression heads, petrol quality in France, and the testing of new stellited valves to counter lead-related seat deterioration. | 11th Sep 1935 | Box 150 \ 1 scan0050 | |
| Letter from Ethyl Export Corporation providing details on a modified Monel metal for aluminium bronze seat inserts. | 30th Sep 1935 | Box 150 \ 1 scan0051 | |
| Criticism from the Ethyl Corporation regarding Spectre valve seats and lead attack. | 1st Oct 1935 | Box 150 \ 1 scan0052 | |
| Material composition analysis of Spectre valve seats, identifying a discrepancy and suggesting the material is Silicon Monel Metal. | 11th Oct 1935 | Box 150 \ 1 scan0053 | |
| Letter from Cleveland Petroleum Products Co. requesting a meeting at the Motor Show to discuss their high octane fuel, Cleveland Discol. | 15th Oct 1935 | Box 150 \ 1 scan0054 | |
| Letter from Ethyl Export Corporation correcting the specification of valve seat material. | 16th Oct 1935 | Box 150 \ 1 scan0055 | |
| Cover letter to F.R. Banks regarding comments on a recommended Valve Seat. | 17th Oct 1935 | Box 150 \ 1 scan0056 | |
| Letter discussing the benefits and application of chromium plating for engine valves and cylinder bores. | 30th Oct 1935 | Box 150 \ 1 scan0057 | |
| Letter discussing chromium plating of exhaust valves and testing Kestrel and Bentley components. | 30th Oct 1935 | Box 150 \ 1 scan0058 | |
| Letter to F.R. Banks regarding testing chromium plating on exhaust valves and cylinder bores. | 5th Nov 1935 | Box 150 \ 1 scan0059 | |
| Letter to F.R. Banks of The Ethyl Export Corporation regarding fuel knock ratings, compression ratios, and stellited valves. | 6th Nov 1935 | Box 150 \ 1 scan0060 | |
| Letter from Ethyl Export Corporation discussing fuel knock-rating in relation to engine design and compression ratios. | 7th Nov 1935 | Box 150 \ 1 scan0061 | |
| Letter suggesting fuel testing procedures to determine knock ratings and fuel requirements for an engine. | 7th Nov 1935 | Box 150 \ 1 scan0062 | |
| Graph of Benzol Response Curves showing the relationship between Octane Number and the percentage of Benzol. | 1st Oct 1935 | Box 150 \ 1 scan0063 | |
| Graph showing the octane number response of petrol when mixed with varying percentages of 90's benzol. | 1st Oct 1935 | Box 150 \ 1 scan0064 | |
| Graph of Benzol response curves, plotting the Octane Number against the percentage by volume of Benzol. | 1st Oct 1935 | Box 150 \ 1 scan0065 | |
| Graph of Benzol response curves, plotting octane number against the percentage of Benzol by volume. | 1st Oct 1935 | Box 150 \ 1 scan0066 | |
| Letter to The Ethyl Export Corporation requesting a figure for a C.F.R. unit to relate knock rating and compression ratio for testing. | 8th Nov 1935 | Box 150 \ 1 scan0067 | |
| Engine pinking complaints on Bentley cars and the influence of fuel quality and octane rating. | 11th Nov 1935 | Box 150 \ 1 scan0068 | |
| Engine detonation, comparing Ethyl and Benzol fuels, and discussing ignition timing adjustments for Bentley cars. | 11th Nov 1935 | Box 150 \ 1 scan0069 | |
| Depot sheet memo regarding an investigation into engine pinking issues caused by a bent governor spindle. | 11th Nov 1935 | Box 150 \ 1 scan0070 | |
| Graph of Benzol response curves, plotting Octane Number against the percentage of Benzol by volume for various fuel standards. | 1st Oct 1935 | Box 150 \ 1 scan0071 | |
| Letter from Ethyl Export Corporation discussing compression ratios and octane numbers of C.F.R. engines. | 11th Nov 1935 | Box 150 \ 1 scan0072 | |
| Page two of a letter to W. A. Robotham offering further assistance on a subject. | 11th Nov 1935 | Box 150 \ 1 scan0073 | |
| Graph showing the relationship between compression ratio and octane number for various engines. | 12th Nov 1935 | Box 150 \ 1 scan0074 | |
| Letter from Ethyl Export Corporation arranging the collection of fuel samples for knock testing. | 12th Nov 1935 | Box 150 \ 1 scan0075 | |
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