| Description | Date | Identifier | |
| Misunderstanding over the testing and suitability of Regent Petrol from Trinidad Leaseholds Ltd. | 15th May 1934 | Box 27a \ 4 Scan308 | |
| Letter from the Ethyl Export-Corporation discussing the octane rating test results for an Ethyl petrol sample. | 26th May 1934 | Box 27a \ 4 Scan309 | |
| Letter to the Ethyl Export Corporation requesting information on valve gear measurement and exhaust butterfly valves. | 30th May 1934 | Box 27a \ 4 Scan310 | |
| Letter from C.C. Wakefield & Co. Ltd. acknowledging a previous correspondence. | 28th May 1934 | Box 27a \ 4 Scan311 | |
| Letter from Shell-Mex and B.P. Ltd inquiring about the official policy on using ethylised (leaded) petrol in new Bentley cars. | 29th May 1934 | Box 27a \ 4 Scan312 | |
| Letter to Shell-Mex regarding the use of Ethyl fuel in experimental Bentley cars. | 30th May 1934 | Box 27a \ 4 Scan313 | |
| Letter from Cleveland Petroleum Products Co. to Bentley Motors regarding tests for their new alcohol fuel, Cleveland Discol. | 30th May 1934 | Box 27a \ 4 Scan314 | |
| Letter from Cleveland Petroleum Products Co. proposing tests on their new alcohol fuel, Discol. | 30th May 1934 | Box 27a \ 4 Scan315 | |
| Letter to Cleveland Petroleum Products Ltd declining to test high-octane or alcohol fuels as their cars are not designed to benefit from them. | 31th May 1934 | Box 27a \ 4 Scan316 | |
| Letter from Cleveland Petroleum Products Co. requesting Rolls-Royce to test their new British Alcohol Blend fuel, Cleveland Discol. | 5th Jun 1934 | Box 27a \ 4 Scan317 | |
| Follow-up letter from Cleveland Petroleum Products Co. to Bentley Motors regarding testing their new British Alcohol fuel blend, Cleveland Discol. | 12th Jun 1934 | Box 27a \ 4 Scan318 | |
| Letter to Cleveland Petroleum Products Ltd. declining interest in fuels with a higher anti-knock value. | 16th Jun 1934 | Box 27a \ 4 Scan319 | |
| Forwarding a letter from The Cleveland Petroleum Products Co. for a decision on whether to reply. | 14th Jun 1934 | Box 27a \ 4 Scan320 | |
| Letter from Bentley Motors acknowledging correspondence from Cleveland Petroleum Products Co. | 14th Jun 1934 | Box 27a \ 4 Scan321 | |
| Letter from Shell-Mex and B.P. Ltd discussing fuel options for Hall's Bentley for the T.T. race. | 23th Jul 1934 | Box 27a \ 4 Scan322 | |
| Offer from Shell to supply 50 gallons of fuel for test purposes for the Ulster race. | 25th Jul 1934 | Box 27a \ 4 Scan323 | |
| Letter to Shell-Mex & B.P. Ltd. regarding fuel performance and requesting octane values for different fuel mixtures. | 25th Jul 1934 | Box 27a \ 4 Scan324 | |
| Letter from Shell-Mex and B.P. Ltd detailing the octane rating test results of Shell Benzole and B.P. Ethyl Benzole mixtures. | 30th Jul 1934 | Box 27a \ 4 Scan325 | |
| Letter from Shell-Mex and B.P. Limited confirming a delayed dispatch of petrol-benzole mixture. | 30th Jul 1934 | Box 27a \ 4 Scan326 | |
| Letter to Shell-Mex & B.P. Ltd. correcting a fuel order. | 31th Jul 1934 | Box 27a \ 4 Scan327 | |
| Clarifying a fuel order correction for a racing entry, specifying lead-free benzole. | 31th Jul 1934 | Box 27a \ 4 Scan328 | |
| Letter from the Anglo-Persian Oil Company confirming the dispatch of a 50-gallon barrel of spirit for a Bentley car. | 2nd Aug 1934 | Box 27a \ 4 Scan329 | |
| Letter from Cleveland Petroleum Products Co. enquiring about tests on carburetter air valve materials for use with their alcohol blend spirit. | 27th Sep 1934 | Box 27a \ 4 Scan330 | |
| Letter to Cleveland Petroleum Products Ltd. concerning the testing of Cleveland Discol fuel for Rolls-Royce and Bentley cars. | 3rd Oct 1934 | Box 27a \ 4 Scan331 | |
| Letter from Cleveland Petroleum Products Co. regarding tests of their 'Cleveland Discol' fuel on Bentley cars. | 4th Oct 1934 | Box 27a \ 4 Scan332 | |
| Proposal to test Regent Super Petrol from Trinidad due to its claimed high anti-knock value. | 9th Oct 1934 | Box 27a \ 4 Scan333 | |
| Letter from Trinidad Leaseholds Ltd. detailing the qualities of their Regent Super petrol and offering a load for testing. | 4th Oct 1934 | Box 27a \ 4 Scan334 | |
| Declining to test Regent Super Petrol but noting it's a good spirit based on road experience. | 11th Oct 1934 | Box 27a \ 4 Scan335 | |
| Requesting an order for a 50-gallon drum of Cleveland 'Discol' spirit for testing purposes. | 13th Oct 1934 | Box 27a \ 4 Scan336 | |
| Request to Cleveland Petroleum for a 50-gallon drum of 'Discol' mixture and its technical specifications for testing. | 13th Oct 1934 | Box 27a \ 4 Scan337 | |
| Request for the best petrol to use to obtain maximum power from Bentley engines for competitive trials. | 26th Oct 1934 | Box 27a \ 4 Scan338 | |
| Fuel types, including Esso, Benzole/Aviation mix, and leaded fuel (TEL), and their effects on Bentley engines. | 30th Oct 1934 | Box 27a \ 4 Scan339 | |
| Personal letter from Ethyl Export Corporation congratulating W. A. Robotham on a speech. | 19th Nov 1934 | Box 27a \ 4 Scan340 | |
| Letter to the Ethyl Export Corporation discussing fuel options to increase the compression ratio of a Bentley engine for a competition. | 20th Nov 1934 | Box 27a \ 4 Scan341 | |
| Letter discussing fuel testing, mentioning Schneider Trophy fuel, and social arrangements. | 20th Nov 1934 | Box 27a \ 4 Scan342 | |
| Letter from Ethyl Export Corporation suggesting fuel compositions for a Bentley. | 21th Nov 1934 | Box 27a \ 4 Scan343 | |
| Technical letter discussing various fuel mixtures, their compositions, and performance characteristics. | 21th Nov 1934 | Box 27a \ 4 Scan344 | |
| Extract from a letter detailing three different fuel specifications with handwritten annotations. | 21th Nov 1934 | Box 27a \ 4 Scan345 | |
| Letter to The Ethyl Export Corporation requesting TEL fluid to test fuel prescriptions. | 22th Nov 1934 | Box 27a \ 4 Scan346 | |
| Letter from Ethyl Export Corporation regarding the supply of lead for fuel mixtures. | 24th Nov 1934 | Box 27a \ 4 Scan347 | |
| Test notes for shock absorbers. | 30th Nov 1908 | Box 28 \ 1 Scan001 | |
| Test results for a shock absorber spring, detailing the force required for different compression levels on Chassis 1291. | 23th May 1910 | Box 28 \ 1 Scan002 | |
| Report card detailing experiments and modifications for springs in shock absorbers. | 28th Feb 1912 | Box 28 \ 1 Scan003 | |
| Report card detailing shock absorber adjustments. | 14th Dec 1911 | Box 28 \ 1 Scan004 | |
| Advisability of lubricating front spring leaves and using shock absorbers. | 19th Nov 1913 | Box 28 \ 1 Scan005 | |
| Fitting of shock dampers and lubrication of front springs, seeking Mr. Royce's opinion on the matter. | 24th Nov 1913 | Box 28 \ 1 Scan006 | |
| Requesting experimentation on a set of Carter Shock Absorbers being sent from New York. | 9th Jun 1919 | Box 28 \ 1 Scan007 | |
| Performance and design of Gabriel Snubber shock absorbers fitted to a Packard car. | 8th Nov 1920 | Box 28 \ 1 Scan008 | |
| The Mack Rubber Shock Absorber, attaching a related letter and enclosures. | 2nd Oct 1922 | Box 28 \ 1 Scan009 | |
| Letter from Rolls Royce of America regarding folders for the Mack rubber shackle and shock absorber. | 21th Sep 1922 | Box 28 \ 1 Scan010 | |
| Letter from the International Motor Company comparing the advantages of their rubber shackles over various foreign spring mechanisms. | 4th Aug 1922 | Box 28 \ 1 Scan011 | |
| Page 2 of a letter from the Chief Engineer discussing new rubber shackles and a rubber shock insulator. | 8th Apr 1922 | Box 28 \ 1 Scan012 | |
| Blueprint showing multiple views and sections of a vehicle's leaf spring suspension system. | 2nd Oct 1922 | Box 28 \ 1 Scan013 | |
| Attaching a copy of a letter and enclosures regarding a Mack Rubber/Shock Absorber. | 2nd Oct 1922 | Box 28 \ 1 Scan014 | |
| Correspondence from Rolls Royce of America regarding the Mack Rubber Shock Absorber and rubber shackles. | 21th Sep 1922 | Box 28 \ 1 Scan015 | |
| Technical letter discussing the advantages of rubber shackles over foreign suspension mechanisms. | 4th Aug 1922 | Box 28 \ 1 Scan016 | |
| Letter from the Chief Engineer discussing suspension arrangements and the superiority of new rubber shackles. | 8th Apr 1922 | Box 28 \ 1 Scan017 | |
| Cutaway diagram illustrating the internal mechanism of a Lovejoy shock absorber. | 8th Apr 1922 | Box 28 \ 1 Scan018 | |
| Blueprint showing different views and cross-sections of a leaf spring suspension system. | 18th Aug 1923 | Box 28 \ 1 Scan019 | |
| Special springs from Messrs. Terry's for shock absorber work and comparing them to the company's own. | 18th Aug 1923 | Box 28 \ 1 Scan020 | |
| Expected arrival of a case containing rear Lovejoy shock absorbers from Springfield. | 16th Nov 1923 | Box 28 \ 1 Scan021 | |
| Rubber Shock Insulators, attaching a copy of another document and blueprints. | 19th Nov 1923 | Box 28 \ 1 Scan022 | |
| Letter discussing proposals for adopting rubber shock insulators on the 40/50 HP chassis. | 8th Nov 1925 | Box 28 \ 1 Scan023 | |
| The development and testing of rear spring brackets and insulators, including results from a Hupmobile test vehicle. | 25th Oct 1925 | Box 28 \ 1 Scan024 | |
| Letter from Rubber Shock Insulator Company regarding blueprints and sketches for a rear spring bracket. | 25th Oct 1925 | Box 28 \ 1 Scan025 | |
| Letter from The Rubber Shock Insulator Company, Inc. regarding the adoption of rubber shackles in the automotive industry. | 3rd Feb 1923 | Box 28 \ 1 Scan026 | |
| Letter from Mack Motor Truck Company regarding bus components and a design suggestion for a door hinge. | 30th Jan 1923 | Box 28 \ 1 Scan027 | |
| Blueprint from the Rubber Shock Insulator Co. illustrating the benefits of using rubber shackles on a car. | 3rd Feb 1923 | Box 28 \ 1 Scan028 | |
| The reverse side of a document marked with a 'FINISHED' stamp. | 3rd Feb 1923 | Box 28 \ 1 Scan029 | |
| Letter from Wm. Griffith & Sons, Ltd. proposing a demonstration of their A.E.F. Shock Absorbing Device. | 26th Feb 1923 | Box 28 \ 1 Scan030 | |
| Telegram from F. S. Duesenberg regarding the performance of rubber shock insulators on a race-winning Duesenberg car. | 30th May 1924 | Box 28 \ 1 Scan031 | |
| Attaching information about Lovejoy shock absorbers becoming a standard fitting on Springfield-made chassis. | 9th Oct 1924 | Box 28 \ 1 Scan032 | |
| Letter from Rolls-Royce of America to Rolls-Royce Ltd. in England regarding the qualities and adjustability of Lovejoy shock absorbers. | 24th Sep 1924 | Box 28 \ 1 Scan033 | |
| Technical notes on shock absorber settings and spring specifications. | 24th Sep 1924 | Box 28 \ 1 Scan034 | |
| Comparative analysis of various shock absorber and spring types for different car models. | 24th Sep 1924 | Box 28 \ 1 Scan035 | |
| Use of alternative shock absorbers and a personal test of Lovejoy shocks. | 27th Apr 1925 | Box 28 \ 1 Scan036 | |
| Letter of introduction for a sales manager and a recommendation for Lovejoy shock absorbers, detailing four key benefits. | 27th Apr 1925 | Box 28 \ 1 Scan037 | |
| Letter discussing the adaptation of racing-car type aluminum shock absorbers for passenger cars. | 27th Apr 1925 | Box 28 \ 1 Scan038 | |
| Letter from Lovejoy Manufacturing Company regarding two sets of hydraulic shock absorbers for testing. | 23th Jul 1925 | Box 28 \ 1 Scan039 | |
| Proposal to purchase and test 'Elland' shock absorbers from Frank Smith & Co. (Elland) Limited. | 28th Sep 1925 | Box 28 \ 1 Scan040 | |
| Letter from Frank Smith & Co. regarding a trial order for Smith Shock Absorbers. | 25th Sep 1925 | Box 28 \ 1 Scan041 | |
| The performance of 'Lovejoy' hydraulic shock absorbers. | 23th Oct 1925 | Box 28 \ 1 Scan042 | |
| The failure of a Lovejoy shock absorber following rig testing. | 27th Oct 1925 | Box 28 \ 1 Scan043 | |
| Running experience of Phantom and India cars, chassis weight reduction, and hydraulic shock absorber development. | 27th Oct 1925 | Box 28 \ 1 Scan044 | |
| Letter from Maurice Olley of Rolls-Royce of America to E.W. Hives of Rolls-Royce Ltd., thanking him for a report on Lovejoy Shock Absorbers. | 9th Nov 1925 | Box 28 \ 1 Scan045 | |
| Request to arrange for a pair of Louis Renault hydraulic shock-absorbers to be sent for comparative testing. | 10th Dec 1925 | Box 28 \ 1 Scan046 | |
| Instructions regarding the return and ordering of Berkshire and Houdaille hydraulic shock absorbers. | 14th Jan 1926 | Box 28 \ 1 Scan047 | |
| Reliability and use of Lovejoy shock absorbers and their similarity to a new RR design. | 2nd Feb 1926 | Box 28 \ 1 Scan048 | |
| Letter regarding a new one-way, oil-filled shock absorber from a Mr. F. Delves. | 6th Feb 1926 | Box 28 \ 1 Scan049 | |
| Letter to 'Maco' Template & Eng. Co. Ltd. requesting blueprints for a set of hydraulic shock absorbers. | 8th Feb 1926 | Box 28 \ 1 Scan050 | |
| Letter from Maco Template & Engineering Co. Ltd. regarding shock absorber blueprints and a patent specification. | 15th Feb 1926 | Box 28 \ 1 Scan051 | |
| Flaws of Houdaille type shock absorbers and the development of a proprietary hydraulic version. | 2nd Feb 1926 | Box 28 \ 1 Scan052 | |
| Letter discussing the use and testing of Lovejoy shock absorbers to address high-speed wobble and shimmy issues. | 23th Feb 1926 | Box 28 \ 1 Scan053 | |
| Letter discussing front spring deflection and the purpose of the stiff front springs on the Phantom model. | 23th Feb 1926 | Box 28 \ 1 Scan054 | |
| Letter discussing the mounting, standardization, and patent issues of Lovejoy versus R.R. hydraulic shock absorbers. | 24th Feb 1926 | Box 28 \ 1 Scan055 | |
| Front brake freezing issues on a Phantom vehicle during a run to Boston. | 24th Feb 1928 | Box 28 \ 1 Scan056 | |
| Installation instructions and parts list for front Lovejoy hydraulic shock absorbers. | 3rd Mar 1925 | Box 28 \ 1 Scan057 | |
| Instructions for determining the correct arm position on Lovejoy hydraulic shock absorbers for horizontal bodies. | 27th Aug 1925 | Box 28 \ 1 Scan058 | |
| Letter discussing the design and benefits of the Lovejoy Road Spring. | 25th Feb 1926 | Box 28 \ 1 Scan059 | |
| Letter describing the attachment of front and rear springs. | 25th Feb 1926 | Box 28 \ 1 Scan060 | |
| | | | |
