| Description | Date | Identifier | |
| Letter to Borg & Beck Co. Ltd. regarding the spring thrust of a Long 10 F.O. Clutch. | 15th Mar 1938 | Box 129 \ 4 scan0173 | |
| Forwarding of a broken 11' clutch pressure plate to Messrs Borg & Beck. | 15th Mar 1938 | Box 129 \ 4 scan0174 | |
| Letter from clutch manufacturer Borg & Beck regarding a burst 11.A3 pressure plate. | 16th Mar 1938 | Box 129 \ 4 scan0175 | |
| Letter from clutch manufacturer Borg & Beck regarding the experimental fitting of a Long 10.C.F. clutch to a Bentley. | 16th Mar 1938 | Box 129 \ 4 scan0176 | |
| Letter of complaint to supplier Borg & Beck about a faulty pressure plate due to substandard iron. | 17th Mar 1938 | Box 129 \ 4 scan0177 | |
| Letter from Borg & Beck Company Ltd regarding a Long 10.C.F. Clutch for a Bentley application. | 18th Mar 1938 | Box 129 \ 4 scan0178 | |
| Specification and recommendation sheet for a Borg & Beck clutch, for a vehicle with a Bentley engine. | 17th Mar 1938 | Box 129 \ 4 scan0179 | |
| Letter to Borg & Beck Co. Ltd. regarding an experimental order for a clutch, clarifying engine bore specifications and requesting related documents. | 19th Mar 1938 | Box 129 \ 4 scan0180 | |
| Letter from clutch manufacturer Borg & Beck Company Ltd. regarding a 10 C.F. Long Clutch, specification BB.460. | 21th Mar 1938 | Box 129 \ 4 scan0181 | |
| Letter from clutch manufacturer Borg & Beck regarding a burst pressure plate. | 21th Mar 1938 | Box 129 \ 4 scan0182 | |
| Chart plotting Centrifugal Force (C.F.) against Revolutions Per Minute (R.P.M.) for various radii of rotation. | 24th Mar 1938 | Box 129 \ 4 scan0183 | |
| Letter to a supplier requesting advice on a clutch's pressure plate finish and adjusting screws. | 30th Mar 1938 | Box 129 \ 4 scan0184 | |
| Letter from clutch manufacturer Borg & Beck regarding the finish and adjustment method of a Long 10 C.F. Clutch. | 2nd Apr 1938 | Box 129 \ 4 scan0185 | |
| Suggestion to add a rubber washer as an upward stop for the clutch pedal on Wraith and Bentley models. | 5th Apr 1938 | Box 129 \ 4 scan0186 | |
| Letter to Ferodo Ltd. discussing a clutch judder issue and the frictional properties of clutch facings. | 7th Apr 1938 | Box 129 \ 4 scan0187 | |
| Letter discussing a 'juddering' clutch plate and testing a new S7732 facing material. | 7th Apr 1938 | Box 129 \ 4 scan0188 | |
| Letter from The Cleveland Graphite Bronze Co. discussing alloys, work with Chrysler and enclosing a report. | 8th Apr 1938 | Box 129 \ 4 scan0189 | |
| Letter from The Cleveland Graphite Bronze Co. discussing issues with brake servo lining, specifically unit pressure and material fading. | 7th Apr 1938 | Box 129 \ 4 scan0190 | |
| Disagreeing with an objection regarding a servo design with one disc instead of two. | 9th Apr 1938 | Box 129 \ 4 scan0191 | |
| Bursting tests and safety recommendations for a Phantom III cast iron flywheel. | 9th Apr 1938 | Box 129 \ 4 scan0192 | |
| Diagrammatic sketch of a suggested rig for a Phantom III flywheel test. | 8th Apr 1938 | Box 129 \ 4 scan0193 | |
| Letter from Ferodo Limited concerning a meeting to examine clutch plates and the S.7732 facing for Bentley/25/30 models. | 11th Apr 1938 | Box 129 \ 4 scan0194 | |
| Letter from Ferodo Limited regarding a meeting to examine clutch plates and S.7732 facings for a Bentley or 25/30 model. | 11th Apr 1938 | Box 129 \ 4 scan0195 | |
| Letter to W.E. Shilton of Ferodo Ltd. confirming a visit to Chapel-en-le-Frith. | 12th Apr 1938 | Box 129 \ 4 scan0196 | |
| The preparation of parts and modification of a flywheel to fit a 10' B & B clutch. | 13th Apr 1938 | Box 129 \ 4 scan0197 | |
| Letter from Ferodo Limited to Mr. N.R. Chandler regarding a meeting and lunch invitation. | 13th Apr 1938 | Box 129 \ 4 scan0198 | |
| Covering note sent with a re-issued copy of a previously mislaid memo. | 20th Apr 1938 | Box 129 \ 4 scan0199 | |
| Noting an alteration to the inertia ring for a semi-flexible low inertia flywheel. | 20th Apr 1938 | Box 129 \ 4 scan0200 | |
| Letter to Ferodo Ltd. following a visit to their works to investigate clutch judder and the frictional characteristics of clutch facings. | 21th Apr 1938 | Box 129 \ 4 scan0201 | |
| Visit to Ferodo Ltd. in Chapel to investigate clutch judder issues. | 21th Apr 1938 | Box 129 \ 4 scan0202 | |
| The microscopic examination of a plate, detailing steel deposits from the flywheel and the deterioration of facing materials. | 21th Apr 1938 | Box 129 \ 4 scan0203 | |
| Comparison of flywheel inertia values in lbs.ins. for various wheel and clutch combinations. | 22th Apr 1938 | Box 129 \ 4 scan0204 | |
| Clutch judder, its potential causes including ferrous coating on facings and engine mounting flexibility. | 28th Apr 1938 | Box 129 \ 4 scan0205 | |
| Letter to a supplier requesting information on an 11' Long Clutch for experimental purposes. | 30th Apr 1938 | Box 129 \ 4 scan0206 | |
| Inquiry into the number of cars fitted with graphite bronze clutch facings and any subsequent complaints received. | 2nd May 1938 | Box 129 \ 4 scan0207 | |
| Letter to Ferodo Ltd. regarding the receipt of unsolicited clutch discs. | 2nd May 1938 | Box 129 \ 4 scan0208 | |
| Letter from Borg & Beck Company Ltd. regarding the supply of a Long 11.C.F. Clutch, including drawings and price details. | 2nd May 1938 | Box 129 \ 4 scan0209 | |
| Letter from Ferodo Limited regarding the supply of clutch disc linings and a discussion about special bronze linings. | 3rd May 1938 | Box 129 \ 4 scan0210 | |
| Letter to Ferodo Ltd. declining to test obsolete clutch facings but requesting alternative samples. | 5th May 1938 | Box 129 \ 4 scan0211 | |
| Letter to Borg & Beck Co. Ltd. requesting a clutch for experimental purposes. | 5th May 1938 | Box 129 \ 4 scan0212 | |
| Two experimental discs supplied free of charge by Ferodo Ltd. | 5th May 1938 | Box 129 \ 4 scan0213 | |
| Request to place an order for a Long 11' C.F. clutch. | 5th May 1938 | Box 129 \ 4 scan0214 | |
| The approximate number of cars fitted with graphite bronze clutch facings and reporting no subsequent complaints. | 5th May 1938 | Box 129 \ 4 scan0215 | |
| Location for the Borg & Beck clutch spring test rig. | 6th May 1938 | Box 129 \ 4 scan0216 | |
| Letter from a clutch manufacturer regarding the supply of an 11' C.F. Long type clutch for experimental purposes. | 6th May 1938 | Box 129 \ 4 scan0217 | |
| Resolution of clutch and synchromesh gear issues by using lead bronze linings. | 6th May 1938 | Box 129 \ 4 scan0218 | |
| Letter to Borg & Beck Co. Ltd. regarding the driven plate for a Long 11' C.F. Clutch. | 7th May 1938 | Box 129 \ 4 scan0219 | |
| Letter from Borg & Beck regarding the specification and assembly of a Long 11.C.F. clutch. | 10th May 1938 | Box 129 \ 4 scan0220 | |
| Specification and recommendation sheet for a clutch for a 25/30 HP model. | 9th May 1938 | Box 129 \ 4 scan0221 | |
| Letter from Ferodo Limited concerning the dimensions of clutch discs and apologising for a delay in correspondence. | 19th May 1938 | Box 129 \ 4 scan0222 | |
| Letter to Ferodo Ltd. regarding clutch pressure plate dimensions. | 20th May 1938 | Box 129 \ 4 scan0223 | |
| Letter from Borg & Beck Company Ltd. confirming a telephone conversation regarding the supply of a 10' Long C.F. Clutch for experimental purposes. | 20th May 1938 | Box 129 \ 4 scan0224 | |
| Short typed memo to Roy requesting an order be sent to B. & B. based on an attached letter. | 20th May 1938 | Box 129 \ 4 scan0225 | |
| Letter to Borg & Beck Co. Ltd. requesting a 10' Long C.F. Bentley clutch for experimental work and providing a specification correction. | 20th May 1938 | Box 129 \ 4 scan0226 | |
| Letter from Ferodo Limited regarding the machining and dispatch of half a dozen S.7732 discs. | 23th May 1938 | Box 129 \ 4 scan0227 | |
| Letter from Ferodo Limited confirming the dispatch of six clutch facings. | 26th May 1938 | Box 129 \ 4 scan0228 | |
| Letter to Ferodo Ltd. regarding the receipt and testing of six 11' facings. | 28th May 1938 | Box 129 \ 4 scan0229 | |
| Letter from Borg & Beck Company Ltd. enclosing deflection curves for driven plates. | 28th May 1938 | Box 129 \ 4 scan0230 | |
| Letter from Ferodo Limited confirming the supply of clutch facings on a 'no charge' basis. | 30th May 1938 | Box 129 \ 4 scan0231 | |
| Dispatch request for clutch facings to be sent to Borg & Beck. | 30th May 1938 | Box 129 \ 4 scan0232 | |
| Letter to Borg & Beck Co. Ltd. requesting the preparation of driven plates fitted with new die-pressed clutch facings for testing. | 30th May 1938 | Box 129 \ 4 scan0233 | |
| Letter from Borg & Beck Company Ltd. regarding the supply and cost of 10' and 11' driven plates. | 31th May 1938 | Box 129 \ 4 scan0234 | |
| Price quote from Borg & Beck for driven plates fitted with Ferodo S-7732. | 1st Jun 1938 | Box 129 \ 4 scan0235 | |
| Letter to Borg & Beck Ltd thanking them for deflection curves and arranging a follow-up meeting. | 1st Jun 1938 | Box 129 \ 4 scan0236 | |
| The testing of a Borg & Beck Clutch Test Rig for Cricklewood, with requests for plate fabrication and modifications. | 9th Jun 1938 | Box 129 \ 4 scan0237 | |
| Request to Borg & Beck Co. Ltd. for various thrust springs for experimental clutches. | 9th Jun 1938 | Box 129 \ 4 scan0238 | |
| Letter from Borg & Beck Company Ltd. confirming a visit to the Rolls-Royce works. | 17th Jun 1938 | Box 129 \ 4 scan0239 | |
| Letter from a clutch manufacturer regarding the delivery of special clutch facings for testing and a proposed centrifugal clutch. | 21th Jun 1938 | Box 129 \ 4 scan0240 | |
| Completion of a test rig for Borg & Beck clutches suitable for both 25/30 and Bentley models. | 21th Jun 1938 | Box 129 \ 4 scan0241 | |
| Instruction to make and fit a pedal plate with spherical mounting for a Bendix Press-O-Meter. | 24th Jun 1938 | Box 129 \ 4 scan0242 | |
| Letter to Bendix Ltd. regarding the supply and modification of a 'Press-o-Meter' for measuring pedal pressures. | 24th Jun 1938 | Box 129 \ 4 scan0243 | |
| Letter from Bendix Limited concerning the supply and pricing of a Press-o-meter instrument. | 27th Jun 1938 | Box 129 \ 4 scan0244 | |
| Letter to Dennis Bros. regarding experimental work on clutches running in oil. | 28th Jun 1938 | Box 129 \ 4 scan0245 | |
| Newly designed rig for testing the clutch pressure on 25/30 and 4¼ Litre models. | 28th Jun 1938 | Box 129 \ 4 scan0246 | |
| Confirming a visit and demonstration related to 25/30 clutches. | 29th Jun 1938 | Box 129 \ 4 scan0247 | |
| Letter to Bendix Ltd. regarding an instrument reading and a foot plate for a Press-o-meter. | 29th Jun 1938 | Box 129 \ 4 scan0248 | |
| Short memo regarding a change in an arrival time from 11 o'clock to 10 o'clock. | 30th Jun 1938 | Box 129 \ 4 scan0249 | |
| Telegram received by telephone confirming a convenient time for a meeting. | 30th Jun 1938 | Box 129 \ 4 scan0250 | |
| Letter from Bendix acknowledging a sketch for a modification to a 'Press-o-meter'. | 1st Jul 1938 | Box 129 \ 4 scan0251 | |
| Test rig specifications for Borg & Beck clutch thrust springs on 25/30 and 4¼ Litre Bentley models. | 6th Jul 1938 | Box 129 \ 4 scan0252 | |
| Clutch judder, the function of anti-rattle springs, and related testing procedures. | 6th Jul 1936 | Box 129 \ 4 scan0253 | |
| Letter to Borg & Beck Co. Ltd. requesting a 10' Long C.F. clutch and a quotation for future bulk orders. | 2nd Aug 1938 | Box 129 \ 4 scan0254 | |
| Letter from a clutch manufacturer concerning test results and a sample driven plate for a Phantom III model. | 10th Aug 1938 | Box 129 \ 4 scan0255 | |
| Letter to Borg & Beck Co. Ltd. regarding a suggested 12' Long C.F. clutch for the Phantom III, discussing thrust and pedal pressure. | 11th Aug 1938 | Box 129 \ 4 scan0256 | |
| Letter requesting a sample clutch of American manufacture for trial purposes before quotation. | 11th Aug 1938 | Box 129 \ 4 scan0257 | |
| Letter to Borg & Beck Co. Ltd. regarding a 13 1/2' 'Borglite' Plate for the Phantom III, discussing deflection data and potential design changes. | 11th Aug 1938 | Box 129 \ 4 scan0258 | |
| Letter to Borg & Beck Co. Ltd. regarding a quotation and feedback on a 10' Long C.F. Clutch. | 11th Aug 1938 | Box 129 \ 4 scan0259 | |
| Letter to Borg & Beck Co. Ltd regarding an omitted specification form for the Phantom III Clutch. | 12th Aug 1938 | Box 129 \ 4 scan0260 | |
| Borg & Beck clutches specification sheet for a Rolls Royce Phantom III. | 12th Aug 1938 | Box 129 \ 4 scan0261 | |
| Summary discussing the application of Graphite Bronze and asbestos-based facings in clutch designs. | 15th Aug 1938 | Box 129 \ 4 scan0262 | |
| On the feasibility of a rivetless bronze-faced clutch and a response to Mr. Vandervell's query about sintered bronze. | 15th Aug 1938 | Box 129 \ 4 scan0263 | |
| Letter from Vandervell Products Ltd. confirming plans to manufacture sintered bronze clutch material and requesting information. | 11th Aug 1938 | Box 129 \ 4 scan0264 | |
| Continuation of a letter from Vandervell Products Ltd. discussing material performance for aircraft super-charger clutches. | 12th Aug 1938 | Box 129 \ 4 scan0265 | |
| Letter from Borg & Beck regarding a 12' Long C.F. Clutch for the Phantom III application. | 12th Aug 1938 | Box 129 \ 4 scan0266 | |
| Letter from Borg & Beck Company Ltd discussing a sample Borglite driven plate for the Phantom III. | 12th Aug 1938 | Box 129 \ 4 scan0267 | |
| Letter from Borg & Beck Company Ltd. regarding a 10' Long C.F. Clutch, discussing tool costs, quotations, and the finish of the pressure plate. | 12th Aug 1938 | Box 129 \ 4 scan0268 | |
| Letter from Borg & Beck Company Ltd. concerning the supply and costs of clutches for the Experimental Phantom III and Bentley applications. | 16th Aug 1938 | Box 129 \ 4 scan0269 | |
| Advice note from Borg & Beck Co., Ltd. for a 13.5 inch Borglite driven plate assembly for a Phantom III. | 16th Aug 1938 | Box 129 \ 4 scan0270 | |
| Advice note from Borg & Beck Co., Ltd. for the dispatch of a clutch assembly. | 16th Aug 1938 | Box 129 \ 4 scan0271 | |
| Letter from Bendix Limited concerning the possibility of obtaining pressure gauges calibrated from Zero to 100 lbs. | 16th Aug 1938 | Box 129 \ 4 scan0272 | |
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