| Description | Date | Identifier | |
| Letter to Borg & Beck Co. Ltd. regarding the failure of two clutch pressure plates during testing. | 30th Jun 1939 | Box 130 \ 3 scan0096 | |
| Letter concerning the low tensile strength of iron castings and comparing engine test bed conditions to on-road conditions. | 30th Jun 1939 | Box 130 \ 3 scan0097 | |
| Instructions for modifying clutch plates to eliminate transmission rattles. | 30th Jun 1939 | Box 130 \ 3 scan0098 | |
| Letter from Borg & Beck Company Ltd. regarding a special 10 inch driven plate assembly. | 30th Jun 1939 | Box 130 \ 3 scan0099 | |
| Letter from clutch manufacturer Borg & Beck regarding an investigation into broken pressure plates. | 3rd Jul 1939 | Box 130 \ 3 scan0100 | |
| Letter from Borg & Beck Company Limited regarding the conclusion of tests and the status of plates on the road. | 3rd Jul 1939 | Box 130 \ 3 scan0101 | |
| Letter to supplier Borg & Beck Ltd. detailing faults found in a consignment of 10' Long clutches. | 21th Jul 1939 | Box 130 \ 3 scan0102 | |
| Letter agreeing to a suggestion to send 6 clutches with the adjusting screws unlocked. | 21th Jul 1939 | Box 130 \ 3 scan0103 | |
| Letter from clutch manufacturer Borg & Beck regarding problems with a recent consignment. | 24th Jul 1939 | Box 130 \ 3 scan0104 | |
| Thickening of the flexible flywheel friction plate, updating part numbers, and requesting testing. | 9th Aug 1939 | Box 130 \ 3 scan0105 | |
| Letter from Hubert HP Trist & Company regarding 'Top Dog' B.W. quality clutch facings sent for testing. | 16th Aug 1939 | Box 130 \ 3 scan0106 | |
| Letter to Hubert HP Trist & Co. regarding a delay in road tests for 'Top Dog' clutch facings. | 17th Aug 1939 | Box 130 \ 3 scan0107 | |
| Letter to Borg & Beck Co.Ltd. regarding difficulties with a 10' Long Clutch, enclosing a memo for review. | 18th Aug 1939 | Box 130 \ 3 scan0108 | |
| Issues and resolutions for Bentley V Long 10' clutches with supplier Borg & Beck. | 1st Sep 1939 | Box 130 \ 3 scan0109 | |
| Clutch balancing issues, including flywheel hole tolerances and cover pressing distortion. | 17th Aug 1939 | Box 130 \ 3 scan0110 | |
| Letter to Borg & Beck Co. Ltd. regarding dimensions and drawings for 10' and 11' long clutches. | 19th Aug 1939 | Box 130 \ 3 scan0111 | |
| Letter from Borg & Beck Company Ltd. confirming arrangements discussed during Mr. Chandler's visit. | 19th Aug 1939 | Box 130 \ 3 scan0112 | |
| Letter to Joseph Lucas Ltd. regarding a new type of starting motor clutch received from Delco Products, USA. | 21th Aug 1939 | Box 130 \ 3 scan0113 | |
| Letter to Messrs. Joseph Lucas Ltd. regarding a Bendix Pinion unit. | 21th Aug 1939 | Box 130 \ 3 scan0114 | |
| Loaning a starting motor clutch to Messrs. Joseph Lucas. | 22th Aug 1939 | Box 130 \ 3 scan0115 | |
| Request for a complete list of flywheels fitted to experimental cars and a table of available experimental flywheels. | 21th Dec 1939 | Box 130 \ 3 scan0116 | |
| Seeking advice on stuck clutches in cars stored for the duration of the War. | 24th Jan 1940 | Box 130 \ 3 scan0117 | |
| Susceptibility of clutches with Thermoid linings to sticking on stored car models. | 25th Jan 1940 | Box 130 \ 3 scan0118 | |
| Clutches on stored cars, specifically regarding thermoid clutch linings and the 'jacking-out' process. | 29th Jan 1940 | Box 130 \ 3 scan0119 | |
| Request for the scheme for a simplified flexible flywheel. | 13th Feb 1940 | Box 130 \ 3 scan0120 | |
| Design and tabulation of flywheels for 6-cylinder engines. | 23th Feb 1940 | Box 130 \ 3 scan0121 | |
| Data sheet comparing flywheel specifications for B.60 and B.80 C.I. engines with Lucas starter motors. | 23th Feb 1940 | Box 130 \ 3 scan0122 | |
| Data table comparing flywheel and clutch specifications for various engine configurations. | 28th Feb 1940 | Box 130 \ 3 scan0123 | |
| Flywheel inertia calculations and design suggestions. | 28th Feb 1940 | Box 130 \ 3 scan0124 | |
| Calculations comparing two design variants (Fig A and Fig B) of a mechanical component, including dimensions, inertia, and weight. | 28th Feb 1940 | Box 130 \ 3 scan0125 | |
| The requirement for high inertia fly-wheels to ensure tractability on small range cars. | 29th Feb 1940 | Box 130 \ 3 scan0126 | |
| Modifications to the light flywheel for the B.60 engine and confirming usage of the heavy type flywheel on certain cars. | 6th Mar 1940 | Box 130 \ 3 scan0127 | |
| Outlining new prints and parts for the R.H. Senior Range B.60 Ripplet flywheel and clutch assembly. | 18th Mar 1940 | Box 130 \ 3 scan0128 | |
| New parts for the flywheel, clutch, and clutch casing of the Left Hand Silver Phantom. | 18th Mar 1940 | Box 130 \ 3 scan0129 | |
| Alteration note cancelling document RG 582 for the Flywheel & Clutch and replacing it with RG 697 due to a Drawing Office error. | 27th Mar 1940 | Box 130 \ 3 scan0130 | |
| Two flywheel alterations (RG 478 and RG 567) due to drawing office errors. | 9th Apr 1940 | Box 130 \ 3 scan0131 | |
| Blueprints for the Ripplet Chassis Flywheel and Clutch, replacing a previous list of parts. | 9th Apr 1940 | Box 130 \ 3 scan0132 | |
| Investigating the cause of clutch thrust failure on a semi-centrifugal clutch. | 22th Jul 1940 | Box 130 \ 3 scan0133 | |
| Specification table for identifying Long Clutches for various engines. | 9th Nov 1940 | Box 130 \ 3 scan0134 | |
| Thoughts on clutch throwout bearings and the elimination of cages. | 9th Nov 1940 | Box 130 \ 3 scan0135 | |
| Request to Borg & Beck Co.Ltd. for a high-torque clutch for an experimental heavy lorry application. | 12th Nov 1940 | Box 130 \ 3 scan0136 | |
| Tank engine clutch specifications and recommendations from Ferodo and Borg & Beck. | 2nd Dec 1940 | Box 130 \ 3 scan0137 | |
| Technical assessment of various clutch options from Borg & Beck, detailing their torque and speed limitations. | 2nd Dec 1940 | Box 130 \ 3 scan0138 | |
| Analysis of different clutch sizes, unit pressures, and spring loads, with comparisons to Borg & Beck specifications. | 2nd Dec 1940 | Box 130 \ 3 scan0139 | |
| Analysis and specifications for an 18-inch single disc clutch, including spring calculations and torque data. | 2nd Dec 1940 | Box 130 \ 3 scan0140 | |
| Report to Borg & Beck, Ltd. regarding periodic lever flutter on a 10' C.P. clutch. | 3rd Dec 1940 | Box 130 \ 3 scan0141 | |
| Technical letter discussing clutch movement ratios and stiffness. | 3rd Dec 1940 | Box 130 \ 3 scan0142 | |
| Letter to Vandervell Products Ltd. regarding the supply and modification of a large clutch disc for experimental purposes. | 5th Dec 1940 | Box 130 \ 3 scan0143 | |
| Letter to Vandervell Products Ltd. concerning the experimental use and modification of a large clutch disc. | 5th Dec 1940 | Box 130 \ 3 scan0144 | |
| Letter to Vandervell Products Ltd. regarding the material choice for bearings. | 30th Nov 1940 | Box 130 \ 3 scan0145 | |
| Confidential letter to Messrs. Borg & Beck, Ltd. regarding the design and dimensional constraints of a 16' twin disc clutch for a tank project. | 20th Dec 1940 | Box 130 \ 3 scan0146 | |
| Testing the effect of a clutch disc on transmission rattle for Chassis No. B.22.AW. | 30th Dec 1940 | Box 130 \ 3 scan0147 | |
| Letter to Borg & Beck Ltd. regarding an investigation into lever flutter on a 10 C.F. clutch, detailing compression and stiffness test results. | 31th Dec 1940 | Box 130 \ 3 scan0148 | |
| Letter discussing the deflection and load characteristics of a stiffened clutch cover assembly. | 1st Dec 1940 | Box 130 \ 3 scan0149 | |
| Graph showing the results of a compression test on a 10 C.F. clutch disc. | 30th Dec 1940 | Box 130 \ 3 scan0150 | |
| Graph comparing deflection tests between a standard and stiffened clutch cover pressing. | 30th Dec 1940 | Box 130 \ 3 scan0151 | |
| Design for stiffening ribs for a clutch cover plate. | 31th Dec 1940 | Box 130 \ 3 scan0152 | |
| Graph illustrating the pressure plate loading against RPM for a 10 CF clutch. | 30th Dec 1940 | Box 130 \ 3 scan0153 | |
| Letter from Borg & Beck discussing a lever flutter issue on the 10 CF Clutch and suggesting modifications. | 11th Dec 1940 | Box 130 \ 3 scan0154 | |
| The redesign of the senior range connecting rod following engine testing. | 17th Dec 1940 | Box 130 \ 3 scan0155 | |
| Letter from Borg & Beck regarding experiments on a 10.C.F. Clutch to trace the reason for lever flutter. | 8th Jan 1941 | Box 130 \ 3 scan0156 | |
| Responding to questions about the construction and longevity of the Borg & Beck clutch centre damping. | 16th Jan 1941 | Box 130 \ 3 scan0157 | |
| Modifications to maintain damping by altering the contact between a disc and hub flange, and increasing torsional spring diameter. | 16th Jan 1941 | Box 130 \ 3 scan0158 | |
| Examining the construction and damping capabilities of a Borg & Beck clutch centre. | 16th Jan 1941 | Box 130 \ 3 scan0159 | |
| Modifications for a damping mechanism, including increasing torsional spring diameter. | 16th Jan 1941 | Box 130 \ 3 scan0160 | |
| Cross-sectional diagram detailing the construction of a Borg & Beck clutch disc. | 15th Nov 1941 | Box 130 \ 3 scan0161 | |
| Development of a clutch centre damping product with Borg & Beck's. | 22th Jan 1941 | Box 130 \ 3 scan0162 | |
| Clutch disc friction testing and its relation to transmission rattle on chassis B.20.AW. | 24th Jan 1941 | Box 130 \ 3 scan0163 | |
| Visit to Borg & Beck discussing friction issues and design changes for 10-inch clutch discs. | 31th Jan 1941 | Box 130 \ 3 scan0164 | |
| Clutch issues, discussing torsion springs, friction tests, and interactions with supplier Borg & Beck. | 31th Jan 1941 | Box 130 \ 3 scan0165 | |
| Visit to Borg & Beck regarding various clutch designs and issues with friction discs. | 31th Jan 1941 | Box 130 \ 3 scan0166 | |
| Clutch disc issues, comparing testing methods and attitudes with supplier Borg & Beck. | 31th Jan 1941 | Box 130 \ 3 scan0167 | |
| Diagram illustrating friction and spring in plates related to a hub flange. | 31th Jan 1941 | Box 130 \ 3 scan0168 | |
| Friction check on a 10' clutch disc and its relation to transmission rattle. | 24th Jan 1941 | Box 130 \ 3 scan0169 | |
| Graph plotting torque against degrees of deflection from a torsional test on a 10 inch clutch for chassis B20AW. | 22th Jan 1941 | Box 130 \ 3 scan0170 | |
| On design improvements for selector lever locking plates and clutch housing clearance. | 4th Feb 1941 | Box 130 \ 3 scan0171 | |
| Letter to Borg & Beck Ltd. concerning a visit and discussions on a 16' twin-plate clutch design. | 5th Feb 1941 | Box 130 \ 3 scan0172 | |
| Meeting notes from a visit to Borg & Beck concerning various clutch disc designs and modifications. | 29th Jan 1931 | Box 130 \ 3 scan0173 | |
| Letter to Borg & Beck Co., Ltd. concerning tank and car clutches. | 5th Feb 1941 | Box 130 \ 3 scan0174 | |
| Letter from Borg & Beck Company Ltd. regarding the design and specifications of tank clutches. | 15th Feb 1941 | Box 130 \ 3 scan0175 | |
| Letter from Borg & Beck Company Limited concerning the supply and testing of 10' Bentley driven plate clutch sample assemblies. | 15th Feb 1941 | Box 130 \ 3 scan0176 | |
| Letter from Borg & Beck detailing specifications for four experimental 10' driven plate clutch assemblies for a Bentley application. | 19th Feb 1941 | Box 130 \ 3 scan0177 | |
| Letter from Borg & Beck Company Ltd. regarding test curves and anticipating comments. | 18th May 1938 | Box 130 \ 3 scan0178 | |
| Graph showing deflection versus torque for a modified 10 inch drive plate with yellow springs. | 18th Feb 1941 | Box 130 \ 3 scan0179 | |
| Graph plotting torque against deflection for a 10 inch drive plate modified with stop pins and spacers. | 19th Feb 1941 | Box 130 \ 3 scan0180 | |
| Graph plotting torque against deflection for a modified 'Plate B' drive plate assembly. | 17th Feb 1941 | Box 130 \ 3 scan0181 | |
| Graph plotting deflection against torque for a 10 inch drive plate modified with stop pins. | 11th Feb 1941 | Box 130 \ 3 scan0182 | |
| The testing of sample 10' clutch discs from Borg & Beck with variations in stop pin length and spacer arrangement. | 7th Mar 1941 | Box 130 \ 3 scan0183 | |
| Comparison of Borg & Beck friction disc test results with in-house results after unit conversion. | 7th Mar 1941 | Box 130 \ 3 scan0184 | |
| Payment for an invoice for 4 Borg & Beck 10' drive plate assemblies. | 17th Mar 1941 | Box 130 \ 3 scan0185 | |
| Analysis of sample 10' clutch discs from Borg & Beck, detailing variations in stop pin length and spacer arrangement. | 7th Mar 1941 | Box 130 \ 3 scan0186 | |
| Comparison of friction disc test results, converting Borg & Beck units to internal units. | 7th Mar 1941 | Box 130 \ 3 scan0187 | |
| Graph showing the results of a torsional deflection test on a 10-inch clutch disc. | 4th Mar 1941 | Box 130 \ 3 scan0188 | |
| Chart showing the results of a torsional deflection test on a 10-inch clutch disc. | 5th Mar 1941 | Box 130 \ 3 scan0189 | |
| Graph showing the results of a torsional deflection test on a 10-inch clutch disc, designated Disc C. | 5th Mar 1941 | Box 130 \ 3 scan0190 | |
| Graph plotting torque against deflection for a torsional deflection test on a 10 inch clutch disc. | 5th Aug 1941 | Box 130 \ 3 scan0191 | |
| Letter from a clutch manufacturer regarding a clutch flutter investigation for a Bentley application. | 15th May 1941 | Box 130 \ 3 scan0192 | |
| Letter from Borg & Beck Company Ltd regarding a 10 C.F. Clutch investigation. | 22th May 1941 | Box 130 \ 3 scan0193 | |
| Visit to Borg & Beck to discuss a complaint about clutch pedal lift with reference to a reply from the Long Co. | 24th May 1941 | Box 130 \ 3 scan0194 | |
| Clutch performance, supplier feedback from Long Company and Borg & Beck, and potential design improvements. | 24th May 1941 | Box 130 \ 3 scan0195 | |
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