| Description | Date | Identifier | |
| Diagram illustrating the distortion of Flexi-Lubri Covers and the reinforcement required to prevent it. | 28th Sep 1927 | Box 140 \ 3 scan0022 | |
| The submission and testing of 'Desmo' steering joint covers. | 28th Sep 1927 | Box 140 \ 3 scan0023 | |
| Testing the oil-holding properties of propeller shaft joints and investigating solutions for oil leaks. | 12th Apr 1929 | Box 140 \ 3 scan0024 | |
| Making S.S. Universal Joints oil-tight, with a focus on filler plug modifications. | 17th Apr 1929 | Box 140 \ 3 scan0025 | |
| Request to test the propeller shaft for car 21-EX, erected with Heldtite, on a rig. | 19th Apr 1929 | Box 140 \ 3 scan0026 | |
| Technical memo detailing tests to overcome oil leakage from propeller shaft universal joints. | 1st Apr 1929 | Box 140 \ 3 scan0027 | |
| With a blueprint diagram outlining the lubrication procedure for 20 HP Mechanics Joints. | 26th Sep 1931 | Box 140 \ 3 scan0028 | |
| Testing of British-made 'Openstrong' jointing material against American alternatives. | 26th Sep 1931 | Box 140 \ 3 scan0029 | |
| Letter from H. Jackson Ltd. promoting their 'OAKENSTRONG' jointing material. | 22th Sep 1931 | Box 140 \ 3 scan0030 | |
| Letter from H. Jackson Ltd. regarding the use of their material against British competitors. | 24th Jan 1933 | Box 140 \ 3 scan0031 | |
| The shrinkage of Cork Linen Rocker Cover Joints during storage. | 24th Jan 1933 | Box 140 \ 3 scan0032 | |
| Two samples of K.D.G. packing material for petrol or oil joints. | 6th Feb 1933 | Box 140 \ 3 scan0033 | |
| Short internal memo authorising the order of a dozen rocker cover joints. | 9th Feb 1933 | Box 140 \ 3 scan0034 | |
| Declining to trial jointing material from Coopers Mechanical Joints Ltd. | 28th Jun 1934 | Box 140 \ 3 scan0035 | |
| New asbestos joints developed by The British Belting & Asbestos Ltd, with samples to be passed on. | 11th Dec 1934 | Box 140 \ 3 scan0036 | |
| Letter from British Belting & Asbestos Ltd. introducing new asbestos jointing materials. | 4th Dec 1934 | Box 140 \ 3 scan0037 | |
| Sample of 'Corok' jointing material from Coopers Mechanical Joints Limited. | 25th Feb 1936 | Box 140 \ 3 scan0038 | |
| Standardisation of universal joints for the Phantom, Bentley, and 25/30 chassis. | 5th Feb 1937 | Box 140 \ 3 scan0039 | |
| Standardisation of Klingerite water joint washers to replace Dermatine ones on all cars. | 19th Apr 1937 | Box 140 \ 3 scan0040 | |
| Cover letter regarding an attached letter and sample of Asbestos & Steel Jointing from Roberts Gaskets Ltd. | 22th Apr 1937 | Box 140 \ 3 scan0041 | |
| Letter from Four Oaks Works regarding their new 'Asbestosteel' jointing product. | 20th Apr 1937 | Box 140 \ 3 scan0042 | |
| Comparison between material specification requirements and laboratory test results for 'Asbestosteel'. | 20th Apr 1937 | Box 140 \ 3 scan0043 | |
| General report and letter from The Roberts Gaskets Ltd. concerning a satisfactory material for joints. | 27th Jun 1936 | Box 140 \ 3 scan0044 | |
| Letter to Leyland Motor Co. Ltd. requesting a meeting to discuss their experience with using magnesium. | 27th Jun 1936 | Box 140 \ 3 scan0045 | |
| Letter from Leyland Motors inviting W.A. Robotham of Rolls-Royce to their works to discuss Elektron metal. | 29th Jun 1936 | Box 140 \ 3 scan0046 | |
| Letter to Leyland Motors Ltd. arranging a visit to their works for the 7th of July. | 30th Jun 1936 | Box 140 \ 3 scan0047 | |
| Letter from Leyland Motors Ltd. acknowledging correspondence and arranging a meeting. | 2nd Jul 1936 | Box 140 \ 3 scan0048 | |
| Letter to Leyland Motors Ltd. acknowledging their letter and advising Mr. Robotham is away on holiday. | 20th Jul 1936 | Box 140 \ 3 scan0049 | |
| Letter to Leyland Motors Ltd. about scheduling a visit to Derby, taking into account the Tourist Trophy race in Ireland. | 28th Jul 1936 | Box 140 \ 3 scan0050 | |
| Letter from Leyland Motors arranging a visit to Derby to inspect products and discuss engine design. | 17th Jul 1936 | Box 140 \ 3 scan0051 | |
| Letter from Leyland Motors Ltd. to Rolls-Royce Ltd. regarding a visit arrangement. | 29th Jul 1936 | Box 140 \ 3 scan0052 | |
| Visit to Leyland Motor Car Company regarding their use and production of magnesium castings. | 25th Aug 1936 | Box 140 \ 3 scan0053 | |
| The use of magnesium castings for engine components, comparing them to aluminum in terms of production, cost, and weight. | 25th Aug 1936 | Box 140 \ 3 scan0054 | |
| The experimental use of magnesium for crankcases and other car components. | 25th Aug 1936 | Box 140 \ 3 scan0055 | |
| Observations made at Leylands, concerning their use of alloys, die-cast aluminium gearboxes, and experiments with chromium-plated cylinder bores. | 25th Aug 1936 | Box 140 \ 3 scan0056 | |
| List of Phantom III light alloy castings detailing their weights in aluminum and potential weight savings. | 25th Aug 1936 | Box 140 \ 3 scan0057 | |
| Letter from Leyland Motors arranging a visit to discuss engine design and the use of aluminium alloys. | 1st Sep 1936 | Box 140 \ 3 scan0058 | |
| Letter to V.W. Pilkington of Leyland Motors regarding a factory visit. | 2nd Sep 1936 | Box 140 \ 3 scan0059 | |
| Return visit from Leylands to discuss magnesium castings. | 2nd Sep 1936 | Box 140 \ 3 scan0060 | |
| Letter from Leyland Motors arranging a provisional date for a works visit. | 7th Sep 1936 | Box 140 \ 3 scan0061 | |
| Letter from Leyland Motors Ltd. to W. A. Robotham rescheduling a works visit. | 12th Sep 1936 | Box 140 \ 3 scan0062 | |
| Letter to Mr. Pilkington of Leyland Motors proposing a new meeting date due to a clash with the Paris Motor Show. | 17th Sep 1936 | Box 140 \ 3 scan0063 | |
| Letter from Leyland Motors Ltd. to W.A. Robotham discussing the rescheduling of a works visit. | 22th Sep 1936 | Box 140 \ 3 scan0064 | |
| Letter to W. Pilkington of The Leyland Motor Co. confirming a works visit. | 25th Sep 1936 | Box 140 \ 3 scan0065 | |
| Letter from Leyland Motors regarding the use of Elektron alloy in crankcases and future testing. | 1st Oct 1936 | Box 140 \ 3 scan0066 | |
| Continuation of a letter from Leyland Motors Limited discussing potential collaborations on components like die-cast parts, water pumps, air cleaners, and braking systems. | 1st Oct 1936 | Box 140 \ 3 scan0067 | |
| Letter from Leyland Motors Limited discussing the standardisation of hydraulic stabilisers for passenger vehicles. | 5th Oct 1936 | Box 140 \ 3 scan0068 | |
| Letter to The Leyland Motor Co. regarding drawings and parts for a Phantom III servo. | 5th Oct 1936 | Box 140 \ 3 scan0069 | |
| Letter from Leyland Motors regarding the supply and testing of a servo mechanism, presumed to be for the Phantom III. | 8th Oct 1936 | Box 140 \ 3 scan0070 | |
| Letter to Leyland Motors Ltd. regarding a Phantom III servo, with a diagram showing its load characteristics. | 10th Oct 1936 | Box 140 \ 3 scan0071 | |
| The despatch of Phantom III parts to Leyland Motor Co. | 12th Oct 1936 | Box 140 \ 3 scan0072 | |
| Letter from Leyland Motors regarding servo equipment for a Phantom III chassis. | 14th Oct 1936 | Box 140 \ 3 scan0073 | |
| Letter from Leyland Motors regarding the potential fitment of stabilising equipment to a Bentley car. | 14th Oct 1936 | Box 140 \ 3 scan0074 | |
| Letter to Leyland Motors regarding the fitting of V.8 Stabilisers to the rear of a Bentley. | 15th Oct 1936 | Box 140 \ 3 scan0075 | |
| Letter to Leyland Motors requesting information on aluminium die-cast parts, comparing them to sand castings. | 26th Oct 1936 | Box 140 \ 3 scan0076 | |
| Letter from Leyland Motors concerning the supply of stabilisers for a Bentley V8. | 23th Oct 1936 | Box 140 \ 3 scan0077 | |
| Letter from Leyland Motors acknowledging a request for information regarding aluminium die cast parts. | 28th Oct 1936 | Box 140 \ 3 scan0078 | |
| Letter from Leyland Motors discussing the percentage savings in weight and machining time for die casting versus sand casting. | 31th Oct 1936 | Box 140 \ 3 scan0079 | |
| Letter from Leyland Motors discussing general sections and die casting of cylinder blocks and crankcases. | 2nd Nov 1936 | Box 140 \ 3 scan0080 | |
| Testing of a stabiliser and comparing it to a similar device used by Leyland Motor Co. | 2nd Nov 1936 | Box 140 \ 3 scan0081 | |
| Letter to Leyland Motors regarding production output, gearbox tool costs, and servo mechanisms. | 2nd Nov 1936 | Box 140 \ 3 scan0082 | |
| Feasibility and cost of die-casting large aluminium parts. | 2nd Nov 1936 | Box 140 \ 3 scan0083 | |
| Summary of the expected advantages and potential economies of die casting. | 2nd Nov 1936 | Box 140 \ 3 scan0084 | |
| Letter from Leyland Motors regarding a request for information on gearbox tool costs and a servo mechanism. | 6th Nov 1936 | Box 140 \ 3 scan0085 | |
| Letter from Leyland Motors regarding the 'Stabilus' hydraulic anti-rolling system. | 10th Nov 1936 | Box 140 \ 3 scan0086 | |
| Letter from Leyland Motors regarding the supply of 'Stabilus type' equipment on a no-charge basis. | 12th Nov 1936 | Box 140 \ 3 scan0087 | |
| Letter from Leyland Motors regarding the cost savings of die casting versus sand casting for a passenger gearbox. | 12th Nov 1936 | Box 140 \ 3 scan0088 | |
| Letter to Leyland Motors thanking them for information regarding die casting gear boxes. | 16th Nov 1936 | Box 140 \ 3 scan0089 | |
| Letter to Leyland Motors requesting information on cylinder materials, wear, and testing methods. | 16th Nov 1936 | Box 140 \ 3 scan0090 | |
| Letter to Leyland Motors Ltd. concerning the testing of a 'Stabilus' hydraulic stabilisation system and requesting the necessary parts. | 16th Nov 1936 | Box 140 \ 3 scan0091 | |
| Letter from Leyland Motors in response to a request for information on cylinder liner materials. | 17th Nov 1936 | Box 140 \ 3 scan0092 | |
| Letter from Leyland Motors Ltd concerning negative test results for upper cylinder lubrication. | 20th Nov 1936 | Box 140 \ 3 scan0093 | |
| Letter from Leyland Motors Ltd. regarding arrangements to test Stabilus equipment on a car. | 20th Nov 1936 | Box 140 \ 3 scan0094 | |
| Letter from Leyland Motors regarding the fitment of hydraulic stabilisers on a 'Bentley' car. | 3rd Dec 1936 | Box 140 \ 3 scan0095 | |
| Letter to Leyland Motors agreeing to delay the test of stabilised equipment. | 4th Dec 1936 | Box 140 \ 3 scan0096 | |
| Letter from Leyland Motors requesting a drawing for a gearbox servo drive and discussing stabilising equipment tests. | 8th Dec 1936 | Box 140 \ 3 scan0097 | |
| Letter to Leyland Motors regarding a drawing for a Phantom III servo drive. | 9th Dec 1936 | Box 140 \ 3 scan0098 | |
| The dispatch of Phantom III Servo Motor parts to Leyland Motor Co. | 9th Dec 1936 | Box 140 \ 3 scan0099 | |
| Letter from Leyland Motors Ltd. thanking W. A. Robotham for a drawing and sample of a servo drive. | 12th Dec 1936 | Box 140 \ 3 scan0100 | |
| Letter from Leyland Motors regarding machining difficulties with Firth's N.M.C. steel and requesting advice. | 29th Dec 1936 | Box 140 \ 3 scan0101 | |
| Letter to Leyland Motors offering advice on machining a difficult material, including speeds, feeds and tooling. | 5th Jan 1937 | Box 140 \ 3 scan0102 | |
| Letter from Leyland Motors introducing Mr. Oscar Cupper, the designer of the Stabilus anti-rolling device. | 8th Feb 1937 | Box 140 \ 3 scan0103 | |
| Letter to Leyland Motors regarding a potential manufacturing license with Graham Paige for Diesel power plants. | 24th May 1937 | Box 140 \ 3 scan0104 | |
| Letter from Leyland Motors Ltd. to Mr. W.A. Robotham regarding a conversation about Graham Paige's and a visit to the United States. | 27th May 1937 | Box 140 \ 3 scan0105 | |
| Letter to Leyland Motors regarding information on petrol engines from the United States, which may not be relevant to their focus on Diesels. | 28th May 1937 | Box 140 \ 3 scan0106 | |
| Letter to Leyland Motors requesting benchmark data on man-hours per pound for aluminium castings. | 30th Jul 1937 | Box 140 \ 3 scan0107 | |
| Letter from Leyland Motors Ltd. regarding a request for information on aluminium castings. | 2nd Aug 1937 | Box 140 \ 3 scan0108 | |
| Letter from Leyland Motors regarding information on finished aluminium castings. | 5th Aug 1937 | Box 140 \ 3 scan0109 | |
| Letter to Leyland Motors regarding information on the production of castings and acceptable scrap rates. | 7th Aug 1937 | Box 140 \ 3 scan0110 | |
| Letter from Leyland Motors to W.A. Robotham regarding production figures and an invitation to visit. | 25th Aug 1937 | Box 140 \ 3 scan0111 | |
| Letter to J. Spurrier of Leyland Motors arranging a visit to discuss cast crankshafts. | 22th Sep 1937 | Box 140 \ 3 scan0112 | |
| Letter from Leyland Motors regarding detail drawings for an exhaust manifold. | 1st Oct 1937 | Box 140 \ 3 scan0113 | |
| Letter to Leyland Motors Ltd regarding the dispatch of a synchromesh cone for inspection. | 2nd Oct 1937 | Box 140 \ 3 scan0114 | |
| 25/30.HP. bronze synchromesh cone be sent to Messrs Leylands for examination. | 2nd Oct 1937 | Box 140 \ 3 scan0115 | |
| Letter to Leyland Motors Ltd. discussing the exchange of drawings for an exhaust manifold, servo spring, and synchromesh cones, and inquiring about a die-cast crankcase. | 4th Oct 1937 | Box 140 \ 3 scan0116 | |
| Letter from Leyland Motors acknowledging the receipt of a synchro-mesh cone for examination. | 5th Oct 1937 | Box 140 \ 3 scan0117 | |
| Letter to Leyland Motors Ltd. regarding experiments with a clutch pedal servo spring. | 7th Oct 1937 | Box 140 \ 3 scan0118 | |
| Letter from Leyland Motors discussing the design and parts for servo springs, synchro-mesh cones, and crankcases. | 9th Oct 1937 | Box 140 \ 3 scan0119 | |
| Dispatch of a bronze synchro mesh cone for examination at Messrs. Leylands. | 13th Oct 1937 | Box 140 \ 3 scan0120 | |
| Letter from Leyland Motors arranging a meeting to discuss cast crankshafts. | 23th Sep 1937 | Box 140 \ 3 scan0121 | |
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