| Description | Date | Identifier | |
| Letter to H. Spurrier of Leyland Motors Ltd, declining an invitation but arranging to arrive on Wednesday morning. | 24th Sep 1937 | Box 140 \ 3 scan0122 | |
| Letter to Leyland Motors regarding a visit to discuss cast iron crankshafts and the supply of aluminium tin bearings for testing. | 1st Nov 1937 | Box 140 \ 3 scan0123 | |
| Letter from Leyland Motors regarding the return of a loaned synchro-mesh cone. | 2nd Nov 1937 | Box 140 \ 3 scan0124 | |
| Letter from Leyland Motors requesting information on synchro-mesh gearboxes. | 4th Dec 1937 | Box 140 \ 3 scan0125 | |
| Letter from Leyland Motors Limited requesting to borrow a synchro-mesh gearbox to evaluate its suitability for a bus service chassis. | 9th Dec 1937 | Box 140 \ 3 scan0126 | |
| Letter to Leyland Motors regarding gearbox specifications and a potential sale. | 9th Dec 1937 | Box 140 \ 3 scan0127 | |
| Letter from Leyland Motors postponing a meeting regarding synchro-mesh gearboxes. | 14th Dec 1937 | Box 140 \ 3 scan0128 | |
| Letter sending a rough draft of a lecture on the properties of 'W' alloy. | 26th Dec 1937 | Box 140 \ 3 scan0129 | |
| Requesting criticism on a paper and proposing a visit. | 1st Jan 1938 | Box 140 \ 3 scan0130 | |
| Letter to Leyland Motors discussing the causes of crankshaft failures in diesel engines. | 1st Jan 1938 | Box 140 \ 3 scan0131 | |
| Technical discussion on crankshaft torsional resonance and the implications of using cast iron versus steel. | 1st Jan 1938 | Box 140 \ 3 scan0132 | |
| Letter to W. West, Esq. concluding a discussion about the cause of a crankshaft failure. | 1st Jan 1938 | Box 140 \ 3 scan0133 | |
| Measurements on a six-cylinder engine regarding crank flexibility, compression ratios, and harmonic amplitude. | 1st Jan 1938 | Box 140 \ 3 scan0134 | |
| Diagram showing the amplitude of torsional vibration oscillation on a Std 20 RR engine without a damper. | 10th Apr 1927 | Box 140 \ 3 scan0135 | |
| Inviting staff to lunch with a visitor from the Leyland Company. | 7th Jan 1938 | Box 140 \ 3 scan0136 | |
| Letter from Leyland Motors arranging a visit to Derby to test a synchro-mesh gearbox. | 18th Jan 1938 | Box 140 \ 3 scan0137 | |
| Letter to Mr. Pilkington of Leyland Motors confirming a meeting appointment. | 19th Jan 1938 | Box 140 \ 3 scan0138 | |
| Request to despatch a Phantom III gearbox, No.14.HS, to Leylands for the attention of Mr. Pilkington. | 21th Jan 1938 | Box 140 \ 3 scan0139 | |
| Dispatch of a Phantom III Gear Box No.14 HS to Leyland Motors. | 22th Jan 1938 | Box 140 \ 3 scan0140 | |
| Visit from Mr. Pilkington of Leylands discussing synchromesh gearboxes, fuel pumps, oil engines, and brakes. | 25th Jan 1938 | Box 140 \ 3 scan0141 | |
| Request for the total factory cost of Phantom III gearbox parts supplied experimentally to Leylands. | 27th Jan 1938 | Box 140 \ 3 scan0142 | |
| Stating the factory cost of a Phantom III gearbox. | 1st Feb 1938 | Box 140 \ 3 scan0143 | |
| Letter from Leyland Motors concerning the purchase and testing of a four-speed synchromesh gearbox. | 2nd Feb 1938 | Box 140 \ 3 scan0144 | |
| Continuation of a letter from Leyland Motors Limited regarding the subject of aluminium blocks. | 9th Feb 1938 | Box 140 \ 3 scan0145 | |
| Approving the sale of a second-hand Phantom III gearbox to Leyland for £100. | 9th Feb 1938 | Box 140 \ 3 scan0146 | |
| Letter from Leyland Motors discussing gearbox and clutch arrangements for a test chassis fitted with an 8.6 litre oil engine. | 18th Mar 1938 | Box 140 \ 3 scan0147 | |
| Continuation of a letter from Leyland Motors Limited regarding a parallel shaft gearbox. | 19th Mar 1938 | Box 140 \ 3 scan0148 | |
| Letter received from Leylands regarding a Phantom III gearbox and synchromesh boxes. | 19th Mar 1938 | Box 140 \ 3 scan0149 | |
| Letter to Leyland Motors regarding gearbox tests, gear ratios, and a clutch drawing. | 21th Mar 1938 | Box 140 \ 3 scan0150 | |
| Letter discussing alterations to a gearbox, including a request for special test gears and a breakdown of current ratios. | 25th Mar 1938 | Box 140 \ 3 scan0151 | |
| Continuation of a letter from Leyland Motors discussing proposed gearbox and axle ratios. | 25th Mar 1938 | Box 140 \ 3 scan0152 | |
| Continuation of a letter from Leyland Motors regarding the availability of modified gears for a public service vehicle. | 29th Mar 1938 | Box 140 \ 3 scan0153 | |
| Letter to Mr. Pilkington of Leyland Motors regarding gearbox design and gear ratios. | 29th Mar 1938 | Box 140 \ 3 scan0154 | |
| Letter to V.W. Pilkington regarding the design of a box and the inability to provide the required ratios. | 9th Apr 1938 | Box 140 \ 3 scan0155 | |
| Letter from Leyland Motors Limited regarding gear ratio information for a Rolls-Royce gearbox. | 9th Apr 1938 | Box 140 \ 3 scan0156 | |
| Letter to V.W. Pilkington of Leyland Motors regarding the results of tests under service conditions. | 12th Apr 1938 | Box 140 \ 3 scan0157 | |
| Letter to Leyland Motors inquiring about their capacity to undertake aluminium foundry work due to production constraints. | 23th May 1938 | Box 140 \ 3 scan0158 | |
| Letter from Leyland Motors regarding the supply of aluminium castings and a potential visit. | 24th May 1938 | Box 140 \ 3 scan0159 | |
| Letter to H. Spurrier of Leyland Motors Ltd arranging a meeting to discuss a gearbox. | 28th May 1938 | Box 140 \ 3 scan0160 | |
| Letter from Leyland Motors declining a request for aluminium castings and arranging a visit to discuss gearbox design. | 30th May 1938 | Box 140 \ 3 scan0161 | |
| From Robotham to Spurrier of Leyland Motors postponing a visit until after Whitsuntide. | 31th May 1938 | Box 140 \ 3 scan0162 | |
| Letter to H. Spurrier Esq., Jnr. of Leyland Motors Limited, requesting a visit to their works. | 1st Jun 1938 | Box 140 \ 3 scan0163 | |
| Letter from Leyland Motors to W.A. Robotham acknowledging a letter and arranging a visit. | 3rd Jun 1938 | Box 140 \ 3 scan0164 | |
| Letter from Leyland Motors Ltd. to Mr. Robotham requesting information on tests for high chrome, high phosphorus cast iron liners and brake drums. | 9th Jun 1938 | Box 140 \ 3 scan0165 | |
| Letter from Leyland Motors Limited to Mr. Robotham requesting permission to use information in a lecture. | 10th Jun 1938 | Box 140 \ 3 scan0166 | |
| Letter to Leyland Motors requesting engine and gearbox weights, costs, and discussing materials and filters. | 10th Jun 1938 | Box 140 \ 3 scan0167 | |
| Bottom gear tooth failures and crankshaft torsional issues. | 10th Jun 1938 | Box 140 \ 3 scan0168 | |
| Letter from the Experimental Dept. to Leyland Motors Ltd. regarding brake drum performance, friction, and wear. | 11th Jun 1938 | Box 140 \ 3 scan0169 | |
| 'Crazy Pattern Cracking' in iron brake drums and potential solutions. | 11th Oct 1938 | Box 140 \ 3 scan0170 | |
| Letter to H. Spurrier of Leyland Motors regarding notes on fitting a General Filter. | 13th Jun 1938 | Box 140 \ 3 scan0171 | |
| Recommendations for the installation and operation of a 'General' Bye Pass Oil Filter. | 13th Jun 1938 | Box 140 \ 3 scan0172 | |
| The performance, construction, and cost of a by-pass oil filter. | 13th Jun 1938 | Box 140 \ 3 scan0173 | |
| Letter from Leyland Motors confirming the despatch of gearbox parts and a spare servo. | 23th Jun 1938 | Box 140 \ 3 scan0174 | |
| Advice note from Leyland Motors Ltd. detailing parts for a gear-box and one spare servo. | 22th Jun 1938 | Box 140 \ 3 scan0175 | |
| The re-assembly of a Phantom III gearbox belonging to Leylands. | 24th Jun 1938 | Box 140 \ 3 scan0176 | |
| Letter from the Experimental Department to Leyland Motors Ltd. confirming receipt of gearbox parts and a spare servo. | 24th Jun 1938 | Box 140 \ 3 scan0177 | |
| Inquiring about a returned gearbox from Leyland Motor Company. | 27th Jun 1938 | Box 140 \ 3 scan0178 | |
| Phantom III gearbox returned by Leyland Motor Co. for repairs. | 28th Jun 1938 | Box 140 \ 3 scan0179 | |
| Letter to Leyland Motors enclosing prints for engine components and issuing instructions for bearing production. | 28th Jun 1938 | Box 140 \ 3 scan0180 | |
| Requesting the forwarding of a Phantom III Gear Box to Messrs Leylands for repair. | 30th Jun 1938 | Box 140 \ 3 scan0181 | |
| Letter from Leyland Motors Limited confirming the dispatch of a connecting rod part to Mr. Rowbotham. | 1st Jul 1938 | Box 140 \ 3 scan0182 | |
| Acknowledgement of receipt for Connecting Rod Part No. 13527D from Leyland Motors Limited. | 2nd Jul 1938 | Box 140 \ 3 scan0183 | |
| Letter to V.W. Pilkington of Leyland Motors discussing the F. type engine, its potential, and development issues. | 1st Jul 1938 | Box 140 \ 3 scan0184 | |
| Taking over a High Power Head engine project from Leylands, which they had abandoned due to exhaust valve issues. | 1st Jul 1938 | Box 140 \ 3 scan0185 | |
| Letter from Leyland Motors discussing connecting rods, engine test reports, and painting procedures. | 30th Jun 1938 | Box 140 \ 3 scan0186 | |
| Letter from Leyland Motors Ltd. detailing the painting and finishing process for various engine components. | 30th Jun 1938 | Box 140 \ 3 scan0187 | |
| Letter from Leyland Motors regarding a visit, the supply of connecting rods, and enclosing engine test reports. | 30th Jun 1938 | Box 140 \ 3 scan0188 | |
| Letter from Leyland Motors detailing the painting procedures for engine components like crankcases, cylinder blocks, and sumps. | 5th Jul 1938 | Box 140 \ 3 scan0189 | |
| Letter from Leyland Motors confirming the despatch of paint supplies. | 5th Jul 1938 | Box 140 \ 3 scan0190 | |
| Letter to Leyland Motors Ltd. inquiring about their crankcase treatment procedures. | 5th Jul 1938 | Box 140 \ 3 scan0191 | |
| Letter requesting further information on a previously mentioned subject. | 5th Jul 1938 | Box 140 \ 3 scan0192 | |
| Follow-up telegram regarding missing drawings and bearings for a Cub engine. | 7th Jul 1938 | Box 140 \ 3 scan0193 | |
| Letter from Leyland Motors regarding a recent visit and the 'F' engine. | 9th Jul 1938 | Box 140 \ 3 scan0194 | |
| Letter from Leyland Motors discussing the process for chromium plating cylinder liners using a specific jig. | 13th Jul 1938 | Box 140 \ 3 scan0195 | |
| Letter from Leyland Motors Limited discussing the dimensions and fitment for sleeves and liners. | 5th Apr 1938 | Box 140 \ 3 scan0196 | |
| Drawing for a jig used to chromium plate the bore of a cylinder liner, including details of its constituent parts. | 5th Apr 1938 | Box 140 \ 3 scan0197 | |
| The despatch of a light alloy connecting rod to the Leyland Motor Co. | 16th Jul 1938 | Box 140 \ 3 scan0198 | |
| Letter from Leyland Motors regarding the painting procedures for crankcases, sumps, and cylinder blocks. | 16th Jul 1938 | Box 140 \ 3 scan0199 | |
| Letter from Leyland Motors Limited about the importance of surface preparation before painting. | 18th Jul 1938 | Box 140 \ 3 scan0200 | |
| Letter to Leyland Motors discussing issues with chromium plating cylinder bores and asking for information on dry liners. | 18th Jul 1938 | Box 140 \ 3 scan0201 | |
| Letter to V.W. Pilkington discussing a superior two-leading shoe brake and its patentees. | 18th Jul 1938 | Box 140 \ 3 scan0202 | |
| Thank you letter to Leyland Motors for information regarding the painting of cylinder blocks. | 18th Jul 1938 | Box 140 \ 3 scan0203 | |
| Letter from Leyland Motors regarding a report by Mr. Markland, AC.9 bearing material, and connecting rods. | 18th Jul 1938 | Box 140 \ 3 scan0204 | |
| Letter from Leyland Motors discussing collaborative testing of gearboxes, brakes, engines, and materials. | 18th Jul 1938 | Box 140 \ 3 scan0205 | |
| Continuation of a letter from Leyland Motors Limited concerning chrome hardening treatment for engine cylinder liners. | 18th Jul 1938 | Box 140 \ 3 scan0206 | |
| Letter from Leyland Motors Limited thanking the recipient for a works visit. | 21th Jul 1938 | Box 140 \ 3 scan0207 | |
| Letter to Leyland Motors regarding the exchange of data on chromium plating and Phosphor Chrome liners. | 21th Jul 1938 | Box 140 \ 3 scan0208 | |
| Letter from Leyland Motors to W.A. Robotham regarding the chromium plating of cylinder liners. | 28th Jul 1938 | Box 140 \ 3 scan0209 | |
| Letter from Leyland Motors discussing the performance and cost of different cylinder liners and a two-leading-shoe brake system. | 28th Jul 1938 | Box 140 \ 3 scan0210 | |
| Continuation of a letter from Leyland Motors Limited concerning tests on a two-leading-shoe. | 29th Jul 1938 | Box 140 \ 3 scan0211 | |
| Letter to Leyland Motors discussing cylinder bore wear, liners, and a two-leading-shoe brake. | 29th Jul 1938 | Box 140 \ 3 scan0212 | |
| Letter from Leyland Motors discussing the cost and performance of different types of cylinder liners. | 2nd Aug 1938 | Box 140 \ 3 scan0213 | |
| Continuation of a letter from Leyland Motors regarding cylinder liners and a braking system. | 4th Aug 1938 | Box 140 \ 3 scan0214 | |
| Letter to Leyland Motors Ltd. acknowledging receipt of special paint and apologising for a delay in acknowledgement. | 4th Aug 1938 | Box 140 \ 3 scan0215 | |
| Letter to Leyland Motors regarding a delay in negotiations for a two-leading-shoe brake. | 4th Aug 1938 | Box 140 \ 3 scan0216 | |
| Letter to V.W. Pilkington of Leyland Motors returning loaned drawings and a report for an 'F' type head. | 12th Aug 1938 | Box 140 \ 3 scan0217 | |
| Letter from Leyland Motors acknowledging receipt of a letter and drawings for an 'F' type head. | 16th Aug 1938 | Box 140 \ 3 scan0218 | |
| Letter from Leyland Motors chasing up an order that should have been transferred to Wellworthy Piston Rings Ltd. | 16th Aug 1938 | Box 140 \ 3 scan0219 | |
| Letter from the Experimental Department to Leyland Motors Ltd. regarding the transfer of a bearing order to Wellworthy Piston Co. | 18th Aug 1938 | Box 140 \ 3 scan0220 | |
| Paint treatment for cast iron crankcases and alum sumps for the B.60 unit, based on information from Leyland's. | 18th Aug 1938 | Box 140 \ 3 scan0221 | |
| | | | |
