| Description | Date | Identifier | |
| Letter to Leyland Motors regarding bore wear and chromium plating on an aluminium cylinder block. | 23th Feb 1940 | Box 140 \ 4 scan0248 | |
| Request for particulars of a centrifugal filtration plant for which an opinion was sought from Leylands. | 26th Feb 1940 | Box 140 \ 4 scan0249 | |
| Letter from Leyland Motors confirming a telephone conversation regarding an upcoming visit. | 26th Feb 1940 | Box 140 \ 4 scan0250 | |
| Letter to H. Spurrier of Leyland Motor Co. confirming the arrangements for a meeting. | 27th Feb 1940 | Box 140 \ 4 scan0251 | |
| Letter from Leyland Motors discussing chromium bore wear on an aluminium cylinder block. | 28th Feb 1940 | Box 140 \ 4 scan0252 | |
| Continuation of a letter from Leyland Motors Limited regarding hard chromium plating. | 29th Feb 1940 | Box 140 \ 4 scan0253 | |
| Letter from Leyland Motors Limited to A. Robotham arranging a meeting. | 29th Feb 1940 | Box 140 \ 4 scan0254 | |
| Letter to V.W. Pilkington of Leyland Motors regarding issues with chromium plating on engine bores. | 1st Mar 1940 | Box 140 \ 4 scan0255 | |
| Letter to H. Spurrier of Leyland Motors confirming arrival details in Derby. | 2nd Mar 1940 | Box 140 \ 4 scan0256 | |
| Letter from Leyland Motors concerning discussions on supercharging and chromium plating. | 13th Mar 1940 | Box 140 \ 4 scan0257 | |
| Letter to Leyland Motors discussing superchargers, plating, cylinder liners, and engine wear. | 14th Mar 1940 | Box 140 \ 4 scan0258 | |
| Letter requesting information about the mileage and operating conditions of an engine unit. | 14th Mar 1940 | Box 140 \ 4 scan0259 | |
| Internal memorandum requesting information and data on centrifugal type superchargers. | 15th Mar 1940 | Box 140 \ 4 scan0260 | |
| Letter from Leyland Motors discussing a visit regarding superchargers, chromium plating, and a patent position. | 20th Mar 1940 | Box 140 \ 4 scan0261 | |
| Technical letter discussing engine re-boring mileages, cylinder wear figures, and cooling systems. | 20th Mar 1940 | Box 140 \ 4 scan0262 | |
| Letter from Leyland Motors Limited confirming a mileage of 40,000 for a unit. | 27th Mar 1940 | Box 140 \ 4 scan0263 | |
| Request from Leyland for assistance with a supercharger design and arranging a meeting for their engineer. | 27th Mar 1940 | Box 140 \ 4 scan0264 | |
| Letter to V.W. Pilkington of Leyland Motors regarding arranging a visit from supercharger personnel. | 27th Mar 1940 | Box 140 \ 4 scan0265 | |
| Request from Leylands for assistance with a supercharger for their compression ignition units. | 27th Mar 1940 | Box 140 \ 4 scan0266 | |
| Letter from Leyland Motors discussing the patent history and specification of short liners in cylinder blocks. | 30th Mar 1940 | Box 140 \ 4 scan0267 | |
| Letter regarding a lapsed patent application for cylinder construction due to prior art. | 1st Apr 1940 | Box 140 \ 4 scan0268 | |
| Letter to W. Pilkington of Leyland Motors Ltd. arranging a visit for Mr. Markland to meet with Mr. Hooker, the supercharger expert. | 1st Apr 1940 | Box 140 \ 4 scan0269 | |
| Letter from Leyland Motors confirming the arrival time and date of Mr. Markland. | 2nd Apr 1940 | Box 140 \ 4 scan0270 | |
| Value of information from Leyland's concerning their unpublished application for cylinder inserts. | 11th Apr 1940 | Box 140 \ 4 scan0271 | |
| Patent specification for improvements to the cylinders of internal combustion engines, specifically a two-part cylinder liner. | 6th Nov 1924 | Box 140 \ 4 scan0272 | |
| Patent claims for a sub-divided, two-part cylinder liner for an internal combustion engine. | 6th Nov 1924 | Box 140 \ 4 scan0273 | |
| Cross-sectional drawing of a mechanical component, likely a cylinder liner, with numbered parts. | 14th Jun 1930 | Box 140 \ 4 scan0274 | |
| Patent specification for improvements to cylinder liners for reciprocating engines. | 14th Jun 1930 | Box 140 \ 4 scan0275 | |
| Patent specification page for a divided cylinder liner for an engine. | 14th Jun 1930 | Box 140 \ 4 scan0276 | |
| Complete specification drawing illustrating two cross-sectional figures of a piston component with rings. | 21th Jul 1931 | Box 140 \ 4 scan0277 | |
| Patent specification for improvements relating to liners for the cylinders of reciprocating engines. | 21th Jul 1931 | Box 140 \ 4 scan0278 | |
| Complete specification drawing showing two figures of a corrugated strip passing through a series of fins. | 22th Jan 1932 | Box 140 \ 4 scan0279 | |
| Patent specification for improvements to liners for the cylinders of reciprocating engines. | 22th Jan 1932 | Box 140 \ 4 scan0280 | |
| Patent specification page detailing claims for an improved divided liner for an internal combustion engine cylinder. | 22th Jan 1932 | Box 140 \ 4 scan0281 | |
| Complete specification drawing with two figures showing cross-sections of mechanical parts. | 15th Apr 1940 | Box 140 \ 4 scan0282 | |
| Brief letter to Leyland Motors Ltd. regarding their patent specifications and any published information on the subject. | 15th Apr 1940 | Box 140 \ 4 scan0283 | |
| Letter to H. Spurrier of Leyland Motors arranging a visit to discuss bearings and the war effort. | 5th Jun 1940 | Box 140 \ 4 scan0284 | |
| Letter from Leyland Motors regarding information on valve springs. | 6th Jun 1940 | Box 140 \ 4 scan0285 | |
| Letter from Leyland Motors regarding crankshafts. | 22th Jul 1940 | Box 140 \ 4 scan0286 | |
| Letter from Leyland Motors Limited regarding their capacity for machining crankshafts. | 20th Jul 1940 | Box 140 \ 4 scan0287 | |
| Letter to H. Spurrier of Leyland Motors regarding production difficulties with crankshaft forgings. | 26th Jul 1940 | Box 140 \ 4 scan0288 | |
| Letter from Leyland Motors regarding a delay in allocating production machines for crankshafts. | 30th Jul 1940 | Box 140 \ 4 scan0289 | |
| Letter to H. Spurrier of Leyland Motors regarding a potential visit to see their oil engine and inquire about component performance. | 26th Sep 1940 | Box 140 \ 4 scan0290 | |
| Letter from Leyland Motors inviting W.A. Robotham for a visit and advising a new engine is on the test bench. | 2nd Oct 1940 | Box 140 \ 4 scan0291 | |
| Letter to H. Spurrier of Leyland Motors regarding a potential visit and offer of accommodation. | 3rd Oct 1940 | Box 140 \ 4 scan0292 | |
| Letter to H. Spurrier of Leyland Motors discussing a recent visit and various engine components like crankshafts, bearings, and tappets. | 12th Oct 1940 | Box 140 \ 4 scan0293 | |
| Letter discussing a tank project, electrical petrol pumps, and associated drawings. | 12th Oct 1940 | Box 140 \ 4 scan0294 | |
| Letter to Leyland Motors Ltd. enclosing a delivery curve for an electrical petrol pump. | 15th Oct 1940 | Box 140 \ 4 scan0295 | |
| Performance curve graph for an HP S.U. petrol pump with a 30' suction lift. | 16th Oct 1940 | Box 140 \ 4 scan0296 | |
| Performance curve graph for an HP S.U. petrol pump, showing flow rate in pints per hour against head in feet. | 16th Oct 1940 | Box 140 \ 4 scan0297 | |
| Performance curve graph for a HP - S.U. petrol pump, plotting pints per hour against head in feet. | 16th Oct 1940 | Box 140 \ 4 scan0298 | |
| Letter from Leyland Motors discussing synchro-mesh gearbox arrangements, drawings, and test results. | 18th Oct 1940 | Box 140 \ 4 scan0299 | |
| Letter discussing various engine development points including bearings, hydraulic tappets, and a 12-cylinder unit. | 11th May 1939 | Box 140 \ 4 scan0300 | |
| Arranging a visit to Leyland Directors. | 21th Oct 1940 | Box 140 \ 4 scan0301 | |
| The arrangement of a visit to Leyland Directors. | 21th Oct 1940 | Box 140 \ 4 scan0302 | |
| Arranging a visit for Leyland executives to the Crewe plant. | 26th Oct 1940 | Box 140 \ 4 scan0303 | |
| Letter discussing issues with electrical petrol pumps and hydraulic tappets. | 23th Oct 1940 | Box 140 \ 4 scan0304 | |
| Letter discussing gearbox and valve lubrication details, acknowledging a recent bombing, and mentioning 'Christie' tanks. | 23th Oct 1940 | Box 140 \ 4 scan0305 | |
| Analysis and comparison of a Leyland gearbox design, focusing on its use in a bus chassis and specific design features. | 23th Oct 1940 | Box 140 \ 4 scan0306 | |
| Confirming arrangements to meet Mr. Spurrier and Mr. Liardet for lunch in the Directors' Dining Room. | 27th Oct 1940 | Box 140 \ 4 scan0307 | |
| Letter from Leyland Motors regarding a delayed reply about a B.V. petrol pump, crankshafts and tappets. | 2nd Nov 1940 | Box 140 \ 4 scan0308 | |
| File divider note indicating correspondence for Hydraulic Tappets is located in a separate file. | 11th Nov 1940 | Box 140 \ 4 scan0309 | |
| Letter to the Institution of Auto. Engineers discussing experiments on brake linings and servo motor operating systems. | 3rd Jan 1934 | Box 141 \ 1 scan0001 | |
| Letter discussing the results of testing 28 types of brake lining material for squeaking and fading. | 3rd Jan 1935 | Box 141 \ 1 scan0002 | |
| Letter to the Institution of Auto. Engineers discussing experiments on brake lining friction and servo motors. | 3rd Jan 1934 | Box 141 \ 1 scan0003 | |
| The testing of various brake lining materials and their associated issues like squeaking and fading. | 3rd Jan 1935 | Box 141 \ 1 scan0004 | |
| Letter from The Institution of Automobile Engineers regarding brake lining tests for fading and squeaking. | 4th Jan 1934 | Box 141 \ 1 scan0005 | |
| Letter to F.J. Hardy regarding the decision to withhold the names of brake lining manufacturers. | 4th Jan 1935 | Box 141 \ 1 scan0006 | |
| The results of testing different servo linings. | 8th Jan 1935 | Box 141 \ 1 scan0007 | |
| Urgent internal request to obtain servo lining discs from Messrs. Ferodo for experimental use on Bentley and 25 HP vehicles. | 8th Jan 1935 | Box 141 \ 1 scan0008 | |
| Poor performance of S.4947 servo linings and their successful replacement with Mintex linings. | 8th Jan 1935 | Box 141 \ 1 scan0009 | |
| The procurement of linings from The British Belting & Asbestos Co.Ltd. | 12th Jan 1935 | Box 141 \ 1 scan0010 | |
| The poor performance of S.4947 linings, leading to the discontinuation of tests and a return to VM.30 material. | 18th Jan 1935 | Box 141 \ 1 scan0011 | |
| Testing of Duron material for servo discs and arranging for further tests on new samples. | 22th Jan 1935 | Box 141 \ 1 scan0012 | |
| Letter from British Belting & Asbestos Ltd arranging a visit regarding tests of Servo Friction Discs. | 19th Feb 1935 | Box 141 \ 1 scan0013 | |
| Duron Servo Linings concluding they are unsuitable for use on cars. | 28th Feb 1935 | Box 141 \ 1 scan0014 | |
| Test report on two types of Duron Servo Linings, one woven and one moulded. | 25th Feb 1935 | Box 141 \ 1 scan0015 | |
| Graph plotting the co-efficient of friction against temperature for Duron servo linings. | 22th Feb 1935 | Box 141 \ 1 scan0016 | |
| Urgent internal order request for twelve Raybestos Clutch Discs. | 27th Feb 1935 | Box 141 \ 1 scan0017 | |
| Letter to Raybestos Balaco Ltd requesting 12 sample Raybestos FF1 clutch friction discs for testing. | 28th Feb 1935 | Box 141 \ 1 scan0018 | |
| Letter from Raybestos-Belaco Ltd regarding an order for 12 clutch discs and a potential manufacturing delay. | 1st Mar 1935 | Box 141 \ 1 scan0019 | |
| Typed letter to Mr. Dalmaine arranging a meeting following a telephone call. | 8th Mar 1935 | Box 141 \ 1 scan0020 | |
| Letter from British Belting & Asbestos Ltd. arranging a meeting with Mr. F.J. Hardy. | 9th Mar 1935 | Box 141 \ 1 scan0021 | |
| Confirming a telephone order for Ferodo servo linings and requesting a covering order. | 13th Mar 1935 | Box 141 \ 1 scan0022 | |
| Memo regarding a hold-up of clutch friction material for the 20/25 model. | 20th Mar 1935 | Box 141 \ 1 scan0023 | |
| The ordering of Bentley clutch linings. | 20th Mar 1935 | Box 141 \ 1 scan0024 | |
| Letter to Ferodo Limited confirming dimensions for Girling brake linings. | 29th Mar 1935 | Box 141 \ 1 scan0025 | |
| To the Order Office confirming a telephone order for linings from Messrs. Ferodo. | 29th Mar 1935 | Box 141 \ 1 scan0026 | |
| Letter to Borg & Beck Ltd. detailing the unsuitability of their FF1 material servo linings after testing. | 13th Apr 1935 | Box 141 \ 1 scan0027 | |
| Letter to Ferodo Limited regarding test results and issues with B.Z. brake linings. | 15th Apr 1935 | Box 141 \ 1 scan0028 | |
| Letter from Borg & Beck Company Ltd regarding unsuitable brake servo linings. | 15th Apr 1935 | Box 141 \ 1 scan0029 | |
| Letter from Borg & Beck Company Ltd. discussing the friction characteristics and manufacturing process of Servo Linings F.F.1 material. | 18th Apr 1935 | Box 141 \ 1 scan0030 | |
| Page two of a letter from Borg & Beck Company Limited regarding further tests. | 18th Apr 1935 | Box 141 \ 1 scan0031 | |
| Follow-up letter from clutch manufacturer Borg & Beck regarding tests on servo linings. | 29th Apr 1935 | Box 141 \ 1 scan0032 | |
| Letter from Ferodo Limited discussing the high-temperature performance of brake linings and potential drum scoring. | 23th Apr 1935 | Box 141 \ 1 scan0033 | |
| Letter to Borg & Beck Co. Ltd. regarding the testing of F.F.1 servo lining material and its unsuitability for use. | 1st May 1935 | Box 141 \ 1 scan0034 | |
| Letter from Borg & Beck Company Ltd discussing the results of tests on brake servo linings made from F.F.1 material. | 7th May 1935 | Box 141 \ 1 scan0035 | |
| Letter to Messrs. Morgan Crossley & Co. Ltd. requesting information on a suitable friction lining material for a brake servo motor. | 12th Jun 1935 | Box 141 \ 1 scan0036 | |
| Letter requesting six sample discs based on print G.56065 for testing purposes. | 12th Jun 1935 | Box 141 \ 1 scan0037 | |
| Letter from Morgan, Crossley & Co Ltd regarding a friction lining for a servo motor brake system. | 17th Jun 1935 | Box 141 \ 1 scan0038 | |
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