| Description | Date | Identifier | |
| Cost-saving analysis comparing an old part with a new part, including the cost of new tooling. | 11th Jul 1936 | Box 129 \ 1 scan0006 | |
| Letter from clutch manufacturers Borg & Beck regarding the Phantom III clutch and sample driven plates. | 9th Sep 1936 | Box 129 \ 1 scan0007 | |
| Letter to Borg & Beck Ltd. requesting information on the coefficient of friction for 'Hycoe' clutch material. | 10th Sep 1936 | Box 129 \ 1 scan0008 | |
| Letter from Borg & Beck Company Ltd. regarding the cost of sample 'Hyco' Friction Facings for a 10' clutch. | 14th Sep 1936 | Box 129 \ 1 scan0009 | |
| Letter from Borg & Beck regarding 'Hyco' friction fabric for a 10' driven plate on a Bentley chassis. | 14th Sep 1936 | Box 129 \ 1 scan0010 | |
| Continuation page of a letter from Borg & Beck Company Limited with an attached sticker for the Olympia Motor Exhibition. | 15th Sep 1936 | Box 129 \ 1 scan0011 | |
| Invoice from Borg & Beck Co. Ltd. for modified Driven Plate Assemblies. | 15th Sep 1936 | Box 129 \ 1 scan0012 | |
| Special clutch driven plate from Borg & Beck for Phantom III experimental testing. | 29th Sep 1936 | Box 129 \ 1 scan0013 | |
| Letter from clutch manufacturer Borg & Beck regarding Hyco Friction Material and a Cushion Segment Driven Plate. | 25th Sep 1936 | Box 129 \ 1 scan0014 | |
| Phantom III driven plate handed over by a Borg & Beck representative. | 2nd Oct 1936 | Box 129 \ 1 scan0015 | |
| Letter from clutch manufacturer Borg & Beck regarding the trial of a new 13.5 inch driven plate. | 3rd Oct 1936 | Box 129 \ 1 scan0016 | |
| Letter to Borg & Beck Ltd. reporting on the performance of a cross cushion clutch plate after testing in a Phantom III. | 8th Oct 1936 | Box 129 \ 1 scan0017 | |
| Page 2 of a letter discussing the widths of facing and potential improvements to cushioning. | 8th Oct 1936 | Box 129 \ 1 scan0018 | |
| Letter from clutch manufacturers Borg & Beck regarding technical data sheets for specific clutch models. | 8th Oct 1936 | Box 129 \ 1 scan0019 | |
| Letter from clutch manufacturer Borg & Beck regarding the performance and testing of a sample driven plate on a Phantom III chassis. | 9th Oct 1936 | Box 129 \ 1 scan0020 | |
| Letter from Borg & Beck Company Ltd regarding a driven plate and disc. | 12th Oct 1936 | Box 129 \ 1 scan0021 | |
| Letter to Messrs. Borg & Beck Co. Ltd. regarding modifications and delivery of an original plate. | 12th Oct 1936 | Box 129 \ 1 scan0022 | |
| Letter from Borg & Beck Company Ltd. regarding a Phantom III Cross Cushion Segment. | 13th Oct 1936 | Box 129 \ 1 scan0023 | |
| Letter to Borg & Beck Ltd. to arrange a meeting to discuss the Phantom III clutch. | 14th Oct 1936 | Box 129 \ 1 scan0024 | |
| Letter to Borg & Beck Ltd. proposing a modification to the Bentley clutch based on Phantom III findings. | 16th Oct 1936 | Box 129 \ 1 scan0025 | |
| Deteriorating accuracy of Borg & Beck clutches for Bentley and 25/30 models. | 17th Oct 1936 | Box 129 \ 1 scan0026 | |
| Order to be placed with Borg & Beck for a specific Bentley Clutch driven plate. | 20th Oct 1936 | Box 129 \ 1 scan0027 | |
| Letter from clutch manufacturers Borg & Beck regarding the construction and testing of a Bentley clutch. | 20th Oct 1936 | Box 129 \ 1 scan0028 | |
| Inspection and relining of a returned Borg and Beck clutch centre plate for a Bentley chassis. | 21th Oct 1936 | Box 129 \ 1 scan0029 | |
| Inspection and relining of a Borg & Beck centre plate from a Bentley chassis. | 23th Oct 1936 | Box 129 \ 1 scan0030 | |
| Inquiry to Ford Motor Company regarding the durability of rubberised friction fabrics for clutches. | 23th Oct 1936 | Box 129 \ 1 scan0031 | |
| Letter to Borg & Beck Ltd. detailing modifications for two returned 10-A-6 type clutch cover assemblies. | 26th Oct 1936 | Box 129 \ 1 scan0032 | |
| Modifications for two 10-A-6 type Bentley clutch cover assemblies sent to Borg & Beck. | 26th Oct 1938 | Box 129 \ 1 scan0033 | |
| Letter from a clutch manufacturer regarding a material supply issue for Eyebolts and a new sample of S.82 steel for testing. | 26th Oct 1936 | Box 129 \ 1 scan0034 | |
| Letter from Borg & Beck Company Ltd. regarding clutch assembly rebuilds and parts. | 27th Oct 1936 | Box 129 \ 1 scan0035 | |
| The physical and chemical testing of S.82 steel for potential use in clutch eyebolts. | 28th Oct 1936 | Box 129 \ 1 scan0036 | |
| Letter from Ford Motor Company clarifying the materials used for clutch facings. | 29th Oct 1936 | Box 129 \ 1 scan0037 | |
| Letter to Borg & Beck Ltd. regarding wear on a 10 A.3. type clutch after endurance testing in a Bentley chassis. | 29th Oct 1936 | Box 129 \ 1 scan0038 | |
| The quality control of Borg and Beck clutches and supplier standards. | 30th Oct 1936 | Box 129 \ 1 scan0039 | |
| Letter to Ford Motor Co. Ltd. about the origin of a clutch disc seen at the Olympia Show. | 30th Oct 1936 | Box 129 \ 1 scan0040 | |
| Letter of enquiry to Messrs. Newton & Bennet Ltd. regarding particulars of their flexible clutch disc. | 31th Oct 1936 | Box 129 \ 1 scan0041 | |
| Letter from a clutch manufacturer regarding wear on a clutch from a Bentley Chassis and arranging a visit to discuss. | 31th Oct 1936 | Box 129 \ 1 scan0042 | |
| Letter to Borg & Beck Company regarding a visit, clutches, a modified plate, and steel tests. | 2nd Nov 1936 | Box 129 \ 1 scan0043 | |
| Graph showing the characteristics of a long semi-centrifugal clutch versus motor RPM. | 1st Apr 1936 | Box 129 \ 1 scan0044 | |
| Letter from Newton & Bennett Ltd. regarding their flexible clutch disc. | 2nd Nov 1936 | Box 129 \ 1 scan0045 | |
| Letter from Borg & Beck Company Ltd. regarding trials and updates to various clutch parts. | 4th Nov 1936 | Box 129 \ 1 scan0046 | |
| Letter from Newton & Bennett Ltd. arranging a visit to discuss a flexible clutch plate. | 4th Nov 1936 | Box 129 \ 1 scan0047 | |
| Letter to Newton & Bennett Ltd. confirming a meeting with Mr. Newton. | 5th Nov 1936 | Box 129 \ 1 scan0048 | |
| Requesting an order for a 10-A-6 type Bentley clutch with specific modifications. | 5th Nov 1936 | Box 129 \ 1 scan0049 | |
| Letter to Borg & Beck Company Ltd. regarding clutch modifications, steel sample testing, and a new clutch order. | 5th Nov 1936 | Box 129 \ 1 scan0050 | |
| Letter from clutch manufacturer Borg & Beck regarding clutch models, materials, and modifications. | 6th Nov 1936 | Box 129 \ 1 scan0051 | |
| Urging action on three specific clutch development jobs. | 9th Nov 1936 | Box 129 \ 1 scan0052 | |
| Letter from Borg & Beck Company Ltd. regarding the manufacture and inspection of 11-inch clutches for a 25-HP application. | 10th Nov 1936 | Box 129 \ 1 scan0053 | |
| Letter to Messrs. Borg & Beck Ltd. proposing a joint inspection process for a number of clutches. | 10th Nov 1936 | Box 129 \ 1 scan0054 | |
| Letter to Messrs. Borg & Beck Ltd. concerning a proposed visit to co-operate on clutch inspection. | 10th Nov 1936 | Box 129 \ 1 scan0055 | |
| Questioning the recent price increase of Borg and Beck clutches for Bentley and 25/30 models. | 10th Nov 1936 | Box 129 \ 1 scan0056 | |
| Letter from clutch manufacturer Borg & Beck regarding a visit and the testing of 10' and 11' clutches. | 11th Nov 1936 | Box 129 \ 1 scan0057 | |
| Confirming a request from Borg and Beck for flywheels and studs to be used for setting up a clutch testing fixture. | 12th Nov 1936 | Box 129 \ 1 scan0058 | |
| Letter from Newton & Bennett Ltd. acknowledging an order for an experimental clutch plate. | 13th Nov 1936 | Box 129 \ 1 scan0059 | |
| Letter to Borg & Beck Co. Ltd. regarding clutch cover distortion, flywheels, and a new fixture. | 13th Nov 1936 | Box 129 \ 1 scan0060 | |
| Letter from clutch manufacturer Borg & Beck regarding supply, packaging, and tolerances of clutches. | 14th Nov 1936 | Box 129 \ 1 scan0061 | |
| The consultation required before fitting Borg and Beck clutches to a chassis. | 14th Nov 1936 | Box 129 \ 1 scan0062 | |
| Promotional document for the Newton Patent Clutch Disc. | 14th Nov 1936 | Box 129 \ 1 scan0063 | |
| The features and advantages of the Newton Clutch Disc. | 16th Oct 1935 | Box 129 \ 1 scan0064 | |
| Reprint from 'The Motor' magazine about an ingenious new clutch plate for smooth pick-up developed by Noel Newton. | 16th Oct 1935 | Box 129 \ 1 scan0065 | |
| Production troubles, price increases, and quality issues with Borg & Beck clutches. | 16th Nov 1936 | Box 129 \ 1 scan0066 | |
| Issue of slack clutch links and the need for improved workmanship on several car models. | 20th Nov 1936 | Box 129 \ 1 scan0067 | |
| Setting difficulties experienced with the Borg & Beck clutch on Bentley & 25/30 HP models. | 26th Nov 1936 | Box 129 \ 1 scan0068 | |
| Instructions for setting and adjusting a clutch mechanism. | 24th Nov 1936 | Box 129 \ 1 scan0069 | |
| Blueprint of a rig for Bentley and 25/30 HP clutch finger operation. | 19th Nov 1936 | Box 129 \ 1 scan0070 | |
| Blueprint detailing modifications for a Bentley 25/30 HP component, comparing an existing and a new scheme with a castellated nut. | 18th Nov 1936 | Box 129 \ 1 scan0071 | |
| Blueprint showing a modification for a Bentley 4 & 25/30 HP, comparing an existing scheme to a new one with a castellated nut. | 18th Nov 1936 | Box 129 \ 1 scan0072 | |
| Letter from Newton & Bennett Ltd. regarding the preparation of drawings and a sample clutch plate for a 'Panthom 3'. | 7th Nov 1936 | Box 129 \ 1 scan0073 | |
| Letter from the Experimental Department to Messrs Borg & Beck Co. Ltd. regarding a finger setting campaign and clutch plates. | 24th Nov 1936 | Box 129 \ 1 scan0074 | |
| The order and subsequent return of 40 eyebolts for an 11A3 type clutch from Borg & Beck. | 24th Nov 1936 | Box 129 \ 1 scan0075 | |
| Requesting an official order for 40 eyebolt nuts for Production Bentley and 25/30 clutches. | 25th Nov 1936 | Box 129 \ 1 scan0076 | |
| Letter from clutch manufacturer Borg & Beck Company Ltd. regarding clutch lever settings and orders. | 27th Nov 1936 | Box 129 \ 1 scan0077 | |
| Letter to a supplier regarding issues with delivered clutches and proposing a collaborative solution for their correction. | 7th Dec 1936 | Box 129 \ 1 scan0078 | |
| Letter from Newton & Bennett Ltd. regarding the despatch of an experimental Newton Clutch Plate. | 9th Dec 1936 | Box 129 \ 1 scan0079 | |
| Letter to Borg & Beck Ltd. discussing specifications and requesting a quotation for clutches. | 12th Dec 1936 | Box 129 \ 1 scan0080 | |
| Page two of a typed document regarding castellated nuts. | 15th Dec 1936 | Box 129 \ 1 scan0081 | |
| Letter from Borg & Beck regarding clutch adjustments, castellated nuts, and a production quote for clutch models 10.A6 and 11.A6. | 15th Dec 1936 | Box 129 \ 1 scan0082 | |
| Letter from Newton & Bennett Ltd. providing technical details for a special clutch disc prepared for a Phantom III model. | 15th Dec 1936 | Box 129 \ 1 scan0083 | |
| Letter to Newton & Bennett Ltd. acknowledging receipt of a clutch disc and noting its high Moment of Inertia. | 16th Dec 1936 | Box 129 \ 1 scan0084 | |
| Modifications, criticisms and adjustments to Borg & Beck clutches. | 19th Dec 1936 | Box 129 \ 1 scan0085 | |
| Letter to Borg & Beck Co. Ltd. regarding rear axle 'overun groans' in a 25/30 HP car and asking for suggestions on damper springs. | 19th Dec 1936 | Box 129 \ 1 scan0086 | |
| Letter to supplier Borg & Beck Ltd. concerning an issue with insufficiently countersunk rivet heads on driven plates. | 22th Dec 1936 | Box 129 \ 1 scan0087 | |
| Return of a faulty Bentley driven plate to Messrs Borg & Beck due to faulty rivetting. | 22th Dec 1936 | Box 129 \ 1 scan0088 | |
| Letter from clutch manufacturer Borg & Beck regarding overrun noise in the rear axle of a 25/30-HP car. | 23th Dec 1936 | Box 129 \ 1 scan0089 | |
| Letter from Borg & Beck acknowledging a complaint about insufficiently countersunk rivet heads on a clutch plate. | 28th Dec 1936 | Box 129 \ 1 scan0090 | |
| Letter from a clutch manufacturer regarding a delay in supplying serrated nuts due to a tool delivery issue. | 4th Jan 1937 | Box 129 \ 1 scan0091 | |
| Stock of Borg & Beck clutch driven discs in the experimental stores and a proposal for their refurbishment. | 5th Jan 1937 | Box 129 \ 1 scan0092 | |
| Letter from Vandervell Products Ltd. regarding lay-out drawings for special discs and enclosing associated blueprints. | 1st Jan 1937 | Box 129 \ 1 scan0093 | |
| Letter from The Cleveland Graphite Bronze Co to Vandervell Products Ltd regarding fitting friction lining on clutch plates. | 18th Dec 1936 | Box 129 \ 1 scan0094 | |
| The concluding page of a typed letter from The Cleveland Graphite Bronze Co. | 24th Nov 1936 | Box 129 \ 1 scan0095 | |
| Engineering drawing for a clutch friction disc. | 24th Nov 1936 | Box 129 \ 1 scan0096 | |
| Blueprint of a clutch friction disc spring. | 25th Sep 1936 | Box 129 \ 1 scan0097 | |
| Blueprint for a clutch driven disc. | 24th Jan 1936 | Box 129 \ 1 scan0098 | |
| Blueprint for a clutch friction disc manufactured by The Cleveland Graphite Bronze Co. | 24th Jun 1936 | Box 129 \ 1 scan0099 | |
| Blueprint of a clutch pressure plate assembly. | 12th Feb 1936 | Box 129 \ 1 scan0100 | |
| Letter from a clutch manufacturer confirming modifications to rivet heads. | 7th Jan 1937 | Box 129 \ 1 scan0101 | |
| Insufficiently countersunk rivets on clutch driven plates from supplier Borg & Beck, and the agreed future specification. | 7th Jan 1937 | Box 129 \ 1 scan0102 | |
| Letter to Vandervell Products Ltd. acknowledging their proposals for a clutch. | 8th Jan 1937 | Box 129 \ 1 scan0103 | |
| Cost breakdown for changing flywheel starter rings on Phantom II and 20 HP models. | 21th Oct 1936 | Box 129 \ 1 scan0104 | |
| Costs and failure rates for the 20-25 H. Solid Flywheel and Starter Ring. | 8th Jan 1937 | Box 129 \ 1 scan0105 | |
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