| Description | Date | Identifier | |
| Letter to Hubert HP Trist & Co. regarding sample orders, expenditures, and results of brake lining tests related to squeak. | 22th Jan 1938 | Box 140 \ 4 scan0148 | |
| Letter to Messrs. Hubert HP Trist & Co. regarding a lining to solve squeaking issues. | 22th Jan 1938 | Box 140 \ 4 scan0149 | |
| Letter from Ferodo Limited discussing the theory of brake lining friction, μ speed curves, and brake squeal. | 24th Jan 1938 | Box 140 \ 4 scan0150 | |
| Letter from Ferodo Limited discussing the friction and wear characteristics of brake lining materials. | 24th Jan 1938 | Box 140 \ 4 scan0151 | |
| Letter from a brake & clutch lining supplier discussing test results and potential issues with 'fading'. | 24th Jan 1938 | Box 140 \ 4 scan0152 | |
| Letter to Ferodo Ltd. regarding the testing of materials on a rig and an invitation to view it. | 25th Jan 1938 | Box 140 \ 4 scan0153 | |
| Letter to Hubert HP Trist & Company arranging a meeting to discuss experimental brake linings. | 25th Jan 1938 | Box 140 \ 4 scan0154 | |
| Request to order graphite and carbon blocks for brake tests. | 26th Jan 1938 | Box 140 \ 4 scan0155 | |
| Letter from Hubert HP Trist & Company arranging a visit and discussing brake linings. | 26th Jan 1938 | Box 140 \ 4 scan0156 | |
| Letter to The British Belting & Asbestos Ltd. inquiring about the characteristics of their Halo 2L material for brake lining. | 31th Jan 1938 | Box 140 \ 4 scan0157 | |
| Letter from Ferodo Limited concerning an inspection of a rig and arranging a works visit. | 27th Jan 1938 | Box 140 \ 4 scan0158 | |
| Letter to Ferodo Ltd. regarding the performance characteristics of a lining and arranging a meeting to discuss further. | 28th Jan 1938 | Box 140 \ 4 scan0159 | |
| The acceptance of unsolicited sample Ferodo brake linings. | 29th Jan 1938 | Box 140 \ 4 scan0160 | |
| Requesting an order for Gandy's Brake Lining from the Gandy Belt Manufacturing Co. | 31th Jan 1938 | Box 140 \ 4 scan0161 | |
| Letter to Gandy's Brake Linings about testing brake materials and placing an order. | 31th Jan 1938 | Box 140 \ 4 scan0162 | |
| Order for servo linings for the Wraith model. | 31th Jan 1938 | Box 140 \ 4 scan0163 | |
| Follow-up letter from General Plastics regarding a sample of liquid resin for impregnating asbestos linings. | 28th Jan 1938 | Box 140 \ 4 scan0164 | |
| Order for six servo linings for the Wraith model from Ferodo Ltd. | 1st Feb 1938 | Box 140 \ 4 scan0165 | |
| Letter to Ferodo Ltd. regarding disappointing test results of V.G.91 samples due to brake squeaking. | 4th Feb 1938 | Box 140 \ 4 scan0166 | |
| Order for Ferodo brake linings to be sent to Cricklewood. | 7th Feb 1938 | Box 140 \ 4 scan0167 | |
| Letter to Richard Klinger Ltd. rejecting their brake lining samples and outlining required friction characteristics. | 7th Feb 1938 | Box 140 \ 4 scan0168 | |
| Letter from Ferodo requesting to borrow a half axle, hub, and brake drum to investigate brake lining squeal. | 8th Feb 1938 | Box 140 \ 4 scan0169 | |
| Letter from Richard Klinger Ltd. regarding the characteristics and improvement of brake lining material. | 9th Feb 1938 | Box 140 \ 4 scan0170 | |
| Letter from Ferodo Limited concerning publications on lubrication. | 10th Feb 1938 | Box 140 \ 4 scan0171 | |
| Letter to Ferodo Ltd. arranging the loan of a Bentley rear axle for a speed test rig. | 11th Feb 1938 | Box 140 \ 4 scan0172 | |
| Letter to Gandy's Linings Ltd. regarding the development of a rig for testing brake lining squeak. | 14th Feb 1938 | Box 140 \ 4 scan0173 | |
| Letter discussing the development and testing of non-squeak brake linings. | 14th Feb 1938 | Box 140 \ 4 scan0174 | |
| Letter to General Plastics Inc. regarding an unsatisfactory 1606 Liquid Resin lining. | 14th Feb 1938 | Box 140 \ 4 scan0175 | |
| Correspondence with supplier Hubert HP Trist & Co. regarding the chamfering of brake linings. | 14th Feb 1938 | Box 140 \ 4 scan0176 | |
| Letter from Hubert HP Trist & Company regarding the chamfering of brake and clutch liners. | 15th Feb 1938 | Box 140 \ 4 scan0177 | |
| From The Cleveland Graphite Bronze Co. discussing brake servo lining and requesting further information. | 15th Feb 1938 | Box 140 \ 4 scan0178 | |
| Loan of parts for a brake test rig to Ferodo Ltd. | 16th Feb 1938 | Box 140 \ 4 scan0179 | |
| Letter to Ferodo Limited regarding a brake testing rig and the dispatch of a Bentley axle and brake drums. | 16th Feb 1938 | Box 140 \ 4 scan0180 | |
| Letter to Gandy's Belt Mfg. Co. Ltd. requesting the installation of a testing rig for brake linings and discussing issues with their current equipment. | 17th Feb 1938 | Box 140 \ 4 scan0181 | |
| Letter from Gandy's Brake Lining rescheduling a proposed works visit. | 19th Feb 1938 | Box 140 \ 4 scan0182 | |
| Order for various Ferodo brake linings. | 21th Feb 1938 | Box 140 \ 4 scan0183 | |
| Letter from a manufacturer regarding the despatch and testing of brake lining samples. | 22th Feb 1938 | Box 140 \ 4 scan0184 | |
| Letter to The Gandy Belt Mfg. Co. Ltd. regarding undesirable characteristics of tested brake lining materials. | 23th Feb 1938 | Box 140 \ 4 scan0185 | |
| The investigation and testing of faulty front brake linings. | 23th Feb 1938 | Box 140 \ 4 scan0186 | |
| Letter to a supplier declining to test their brake linings due to previous poor performance and obsolescence. | 24th Feb 1938 | Box 140 \ 4 scan0187 | |
| Letter from Gandy's Brake Lining discussing surprising road test results where a car began diving to the side of the road. | 28th Feb 1938 | Box 140 \ 4 scan0188 | |
| B.Z. quality brake linings for 20-25.HP. cars. | 2nd Mar 1938 | Box 140 \ 4 scan0189 | |
| Letter to Messrs. Ferodo Ltd. regarding a potential stencilling error on a parts order. | 4th Mar 1938 | Box 140 \ 4 scan0190 | |
| Letter from Ferodo Limited addressing an error in the stencilling of ordered linings. | 5th Mar 1938 | Box 140 \ 4 scan0191 | |
| Personal letter declining an invitation to a dance due to R.A.F. Reserve commitments. | 7th Mar 1938 | Box 140 \ 4 scan0192 | |
| Request to Ferodo Ltd. for the urgent production of 12 pieces of undrilled lining. | 7th Mar 1938 | Box 140 \ 4 scan0193 | |
| Supply and use of Thermoid brake linings for the Wraith model. | 8th Mar 1938 | Box 140 \ 4 scan0194 | |
| Urgent internal request to order undrilled brake lining material from Ferodo Ltd. for the Wraith 4 shoe brake. | 8th Mar 1938 | Box 140 \ 4 scan0195 | |
| Order for 12 servo discs for the Wraith & RIII models and standardising the material. | 15th Mar 1938 | Box 140 \ 4 scan0196 | |
| Letter to Ferodo Ltd. regarding complaints about brake linings. | 22th Mar 1938 | Box 140 \ 4 scan0197 | |
| Letter from Ferodo Limited regarding brake lining exudation, servo motor performance, and a proposed visit to inspect a Bentley axle rig. | 25th Mar 1938 | Box 140 \ 4 scan0198 | |
| Letter from Ferodo Limited concerning brake lining exudation and servo motor facing complaints. | 11th Apr 1938 | Box 140 \ 4 scan0199 | |
| Letter from Gandy's Brake Lining concerning a visit to inspect a new brake lining testing machine and the submission of new samples for testing. | 22th Apr 1938 | Box 140 \ 4 scan0200 | |
| Letter from Gandy's regarding the beneficial effects of 'Safeguard' brake lining on the elimination of brake squeak. | 22th Apr 1938 | Box 140 \ 4 scan0201 | |
| Letter to Ferodo Ltd. regarding issues with brake linings depositing on drums, particularly on the Phantom III model. | 28th Apr 1938 | Box 140 \ 4 scan0202 | |
| Request to send two partly used brake linings to Ferodo Ltd. to be cut up. | 28th Apr 1938 | Box 140 \ 4 scan0203 | |
| Letter from Hubert HP Trist & Co. enquiring about the status of brake linings submitted for testing. | 29th Apr 1938 | Box 140 \ 4 scan0204 | |
| Letter to The Gandy Belt Manufacturing Co., Ltd. regarding promising test results from the 400 G.M.3. | 3rd May 1938 | Box 140 \ 4 scan0205 | |
| Correspondence to Hubert HP Trist & Co.Ltd. regarding the testing of material samples on a Bentley and a 25/30 HP car. | 5th May 1938 | Box 140 \ 4 scan0206 | |
| Letter from Hubert HP Trist & Company regarding the performance and mileage of 'Top Dog' TSM/B brake/clutch linings. | 6th May 1938 | Box 140 \ 4 scan0207 | |
| Letter from Gandy's Brake Lining regarding the installation of a machine to investigate the co-efficient of friction. | 6th May 1938 | Box 140 \ 4 scan0208 | |
| Page two of a letter from GANDY'S discussing experiments with 'Safeguard' brake lining materials and brake squeal issues. | 6th May 1938 | Box 140 \ 4 scan0209 | |
| Order for Wraith Servo Linings from Ferodo Ltd. for testing. | 9th May 1938 | Box 140 \ 4 scan0210 | |
| Letter to Messrs. Ferodo Ltd. from the Experimental Dept. enquiring about a pending order for servo linings. | 27th May 1938 | Box 140 \ 4 scan0211 | |
| Letter to a supplier discussing test results of a lining material, its performance, and suggestions for improvement. | 28th May 1938 | Box 140 \ 4 scan0212 | |
| Letter from Ferodo confirming the dispatch date for an order of servo linings. | 31th May 1938 | Box 140 \ 4 scan0213 | |
| Letter from Ferodo Limited concerning test results on two returned MR.3 brake linings exhibiting exudation. | 15th Jun 1938 | Box 140 \ 4 scan0214 | |
| Request to issue an official order to Ferodo Ltd. for three servo linings for experimental work on B.50 and Bentley III. | 30th Jun 1938 | Box 140 \ 4 scan0215 | |
| The ordering and testing of brake linings for the Wraith 'B' series. | 11th Aug 1938 | Box 140 \ 4 scan0216 | |
| Inquiry from Hubert HP Trist & Co. regarding the status of the TSM/B for a 25/30 HP car. | 12th Jul 1938 | Box 140 \ 4 scan0217 | |
| Letter from the Experimental Department to a supplier regarding preliminary tests on submitted linings. | 5th Aug 1938 | Box 140 \ 4 scan0218 | |
| Request to order 30 undrilled TSM/B brake linings from Herbert Trist & Co. for experimental work. | 5th Aug 1938 | Box 140 \ 4 scan0219 | |
| Order for front and rear brake linings for the Wraith model. | 6th Aug 1938 | Box 140 \ 4 scan0220 | |
| Packing slip from Ferodo Limited for 6 RAD13 Discs. | 30th Jun 1938 | Box 140 \ 4 scan0221 | |
| Enquiry to The Morgan Crucible Co. Ltd. regarding the supply of graphite cones for brake linings. | 4th Oct 1938 | Box 140 \ 4 scan0222 | |
| Internal request to order 10 pieces of experimental VG.90 brake lining from Ferodo Ltd. | 5th Oct 1938 | Box 140 \ 4 scan0223 | |
| Request to Ferodo Ltd. for the supply of 10 pieces of undrilled VG.90 brake lining. | 5th Oct 1938 | Box 140 \ 4 scan0224 | |
| Letter to Messrs. Ferodo Ltd. requesting the urgent supply of brake lining materials to specific drawing numbers. | 7th Nov 1938 | Box 140 \ 4 scan0225 | |
| Official order to Ferodo Ltd. for brake linings. | 8th Nov 1938 | Box 140 \ 4 scan0226 | |
| Internal request to issue an official order to Ferodo Ltd. for flexible material for a Bentley III. | 10th Nov 1938 | Box 140 \ 4 scan0227 | |
| Letter from the Experimental Department to Ferodo Ltd. requesting a supply of flexible material. | 10th Nov 1938 | Box 140 \ 4 scan0228 | |
| Letter to Ferodo Ltd. regarding the examination of BZ brake lining samples and comparison with other materials. | 11th Nov 1938 | Box 140 \ 4 scan0229 | |
| Requesting the despatch of two brake lining samples to Mr. Longley at Ferodo Ltd. for examination and report. | 11th Nov 1938 | Box 140 \ 4 scan0230 | |
| Letter from Ferodo Limited confirming the despatch date for a further supply to drawing GB.3760. | 11th Nov 1938 | Box 140 \ 4 scan0231 | |
| Letter from Ferodo Limited following up on the non-receipt of two Ferodo BZ brake lining samples requested for examination. | 24th Nov 1938 | Box 140 \ 4 scan0232 | |
| Letter to Leyland Motors Ltd. concerning the oil consumption and inspection of a Cub engine. | 3rd Jan 1940 | Box 140 \ 4 scan0233 | |
| Letter to V.W. Pilkington of Leyland Motors asking for an opinion on a system of oil purification. | 19th Jan 1940 | Box 140 \ 4 scan0234 | |
| Letter from Leyland Motors regarding a fractured aluminium cylinder block on a Cub engine. | 22th Jan 1940 | Box 140 \ 4 scan0235 | |
| Letter to V.W. Pilkington of Leyland Motors regarding chromium-plated cylinder bores. | 24th Jan 1940 | Box 140 \ 4 scan0236 | |
| Letter from Leyland Motors regarding the value of an oil purification plant used in their engine test department. | 2nd Feb 1940 | Box 140 \ 4 scan0237 | |
| Continuation of a letter from Leyland Motors Limited returning a descriptive article. | 3rd Feb 1940 | Box 140 \ 4 scan0238 | |
| Cover memo forwarding a copy of a letter received from Leyland Motors Ltd. | 3rd Feb 1940 | Box 140 \ 4 scan0239 | |
| Letter from Leyland Motors regarding the effectiveness of their oil purification plant used in the engine test department. | 2nd Feb 1940 | Box 140 \ 4 scan0240 | |
| Letter from Leyland Motors regarding the dispatch of a damaged aluminium combined crankcase and cylinder block. | 12th Feb 1940 | Box 140 \ 4 scan0241 | |
| Letter to V.W. Pilkington of Leyland Motors regarding a dry liner aluminium block engine and a servo brake system. | 13th Feb 1940 | Box 140 \ 4 scan0242 | |
| Letter from Leyland Motors regarding experimental work on cylinder liners and bores. | 16th Feb 1940 | Box 140 \ 4 scan0243 | |
| Letter from Leyland Motors Limited discussing engine block wear and a shelved servo brake project. | 19th Feb 1940 | Box 140 \ 4 scan0244 | |
| Letter to H. Spurrier Jnr. of Leyland Motors Ltd. inviting him to visit Crewe and to examine an aluminium cylinder block. | 19th Feb 1940 | Box 140 \ 4 scan0245 | |
| Letter from Leyland Motors to W.A. Robotham regarding a planned visit. | 21th Feb 1940 | Box 140 \ 4 scan0246 | |
| Letter to H. Spurrier of Leyland Motors arranging a meeting and discussing attendees. | 23th Feb 1940 | Box 140 \ 4 scan0247 | |
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