| Description | Date | Identifier | |
| Blueprint for a taper Magneto Drive and the production of Undershields. | 26th Feb 1925 | Box 66 \ 3 scan0276 | |
| Supply of Flywheel & Clutch unit parts for the EAC.11 proposal and a required design modification. | 1st Mar 1924 | Box 66 \ 4 scan0001 | |
| Secret memo regarding an experimental drawing for a gravity clutch brake. | 27th Mar 1924 | Box 66 \ 4 scan0002 | |
| Secret memo discussing drawing No.LeC.1869, which details a proposed spring for a clutch stop mechanism. | 8th May 1924 | Box 66 \ 4 scan0003 | |
| Secret memo discussing engine detonations, over-running vibrations, and clutch brake issues on the EAC engine. | 8th May 1924 | Box 66 \ 4 scan0004 | |
| Secret memo regarding a drawing for a clutch brake spring pressure device. | 2nd May 1924 | Box 66 \ 4 scan0005 | |
| Cause of a clutch failing to disengage and proposing a new fitting to fix the issue. | 2nd May 1924 | Box 66 \ 4 scan0006 | |
| Testing and modifying an E.A.C. clutch brake. | 20th May 1924 | Box 66 \ 4 scan0007 | |
| Confirming a spring fitted to the E.A.C. Clutch has resolved performance issues. | 5th May 1924 | Box 66 \ 4 scan0008 | |
| Determining the moment of inertia for EAC and 40/50 HP flywheels. | 20th Mar 1924 | Box 66 \ 4 scan0009 | |
| Comparison table of flywheel and clutch specifications for the EAC and 40/50 HP models. | 16th Feb 1925 | Box 66 \ 4 scan0010 | |
| Secret memorandum discussing clutch difficulties, specifically slipping and disengagement, on the 98-NK test car. | 16th Feb 1925 | Box 66 \ 4 scan0011 | |
| Secret memo regarding an improvement to the E.A.C. Clutch's 'gentle take-up plungers'. | 23th Feb 1925 | Box 66 \ 4 scan0012 | |
| Secret memorandum on the E.A.C. clutch and flywheel, noting it is heavier with more inertia than the 40/50 model, and requesting an investigation into weight and cost reduction. | 13th Mar 1935 | Box 66 \ 4 scan0013 | |
| Corrections and modifications for clutches on 'V' Series and 'B' type chassis. | 20th Mar 1925 | Box 66 \ 4 scan0014 | |
| Design and manufacturing modifications for an E.A.C. Clutch to reduce weight, inertia, and cost. | 21th Mar 1925 | Box 66 \ 4 scan0015 | |
| Modifications to a flywheel rim to reduce inertia, weight, and expense, including a diagram and handwritten notes. | 21th Mar 1925 | Box 66 \ 4 scan0016 | |
| Proposing an improved scheme for a car clutch mechanism. | 5th Dec 1925 | Box 66 \ 4 scan0017 | |
| Authorisation sheet for a new clutch trunnion design on the 'V' Series to resolve a noise issue and improve output. | 14th May 1925 | Box 66 \ 4 scan0018 | |
| Secret memo from AJS regarding an improved E.A.C. clutch damping device with alternatives for fitting. | 15th May 1925 | Box 66 \ 4 scan0019 | |
| Secret memo describing an improved EAC clutch with a new damping mechanism and other modifications. | 15th May 1925 | Box 66 \ 4 scan0020 | |
| Clutch dismantling procedures and design suggestions for clutch components. | 21th May 1925 | Box 66 \ 4 scan0021 | |
| Authorisation sheet for a modification to use a flat race clutch trunnion. | 21th May 1925 | Box 66 \ 4 scan0022 | |
| Causes and potential cures for eccentricity in clutch assemblies. | 22th May 1925 | Box 66 \ 4 scan0023 | |
| Continued discussion on production methods for flywheels and crankshafts, weighing accuracy against efficiency. | 28th May 1925 | Box 66 \ 4 scan0024 | |
| Proceeding with an experiment to make the F.A.C. Clutch Flywheel and Cover as separate units. | 28th May 1925 | Box 66 \ 4 scan0025 | |
| Design changes to the EAC clutch stop, referencing drawing LeC. 2080. | 10th Jun 1925 | Box 66 \ 4 scan0026 | |
| Modifications to the EAC clutch, suggesting using fabric on revolving parts. | 3rd Jul 1925 | Box 66 \ 4 scan0027 | |
| New light type clutch plate for the EAC clutch, its construction, and a request for a dismantling report. | 9th Jul 1925 | Box 66 \ 4 scan0028 | |
| With a sketch proposing a modification to the light clutch to ease split pin insertion. | 14th Jul 1925 | Box 66 \ 4 scan0029 | |
| Cover note for a report on the machining of E.A.C. clutches. | 14th Jul 1925 | Box 66 \ 4 scan0030 | |
| Alterations to the Slipper Flywheel dowel design, referencing drawing LeC.2131. | 31th Aug 1925 | Box 66 \ 4 scan0031 | |
| Machining of the new Phantom clutch unit, detailing tolerances and issues with crankshaft flanges. | 27th Oct 1925 | Box 66 \ 4 scan0032 | |
| Procedure for fitting a clutch unit to a crankshaft. | 27th Oct 1925 | Box 66 \ 4 scan0033 | |
| Present and proposed manufacturing methods for the 'Phantom' clutch unit to improve interchangeability. | 29th Oct 1925 | Box 66 \ 4 scan0034 | |
| Comparison of existing and proposed methods for a crankshaft and flywheel assembly. | 9th Nov 1925 | Box 66 \ 4 scan0035 | |
| Complaints of clutch 'jagger' in New Phantom models. | 9th Nov 1925 | Box 66 \ 4 scan0036 | |
| Clutch jaggering issues on 'New Phantom' cars, listing specific chassis and actions taken. | 13th Nov 1925 | Box 66 \ 4 scan0037 | |
| Comparing the moment of inertia of a new light type clutch plate unit against the standard. | 23th Nov 1925 | Box 66 \ 4 scan0038 | |
| Standardisation of chassis parts, specifically a slipper wheel fitted with dowel pegs to improve reliability. | 10th Dec 1925 | Box 66 \ 4 scan0039 | |
| Standardisation document for a lightened flywheel and clutch to reduce weight and cost. | 10th Dec 1925 | Box 66 \ 4 scan0040 | |
| Benefits and implementation of a lighter, more powerful aluminium engine for the Phantom model. | 11th Apr 1926 | Box 66 \ 4 scan0041 | |
| Clutch failures on the 40/50 HP model due to oil contamination on the clutch surfaces. | 15th Apr 1926 | Box 66 \ 4 scan0042 | |
| Investigating a slipping clutch complaint, which was found to be an isolated incident due to excessive lubrication. | 22th Apr 1926 | Box 66 \ 4 scan0043 | |
| Development of a lighter clutch, flywheel, and new gearbox for the Phantom model. | 17th Apr 1926 | Box 66 \ 4 scan0044 | |
| Further lightening of the Phantom flywheel and clutch by comparing its weight and moment of inertia with the Silver Ghost. | 26th Apr 1926 | Box 66 \ 4 scan0045 | |
| New lightened axle and clutch issues on the 12-EX car, including a new Ferodo clutch disc test. | 29th May 1926 | Box 66 \ 4 scan0046 | |
| Comparing the inertia and weight of flywheel and clutch units for the Phantom and Silver Ghost models. | 10th Jun 1926 | Box 66 \ 4 scan0047 | |
| Faults found in car 7-EX after a 260-mile test run. | 15th Jun 1926 | Box 66 \ 4 scan0048 | |
| Adjustment issues and wear on the Phantom clutch. | 18th Jun 1926 | Box 66 \ 4 scan0049 | |
| Proposed modifications for the EAC clutch, specifically additional lightening and a reduction in the diameter of the ferodo. | 26th Jun 1926 | Box 66 \ 4 scan0050 | |
| The use of taper bolts for securing the flywheel to the crankshaft on the EAC clutch. | 1st Jul 1926 | Box 66 \ 4 scan0051 | |
| Confirmation of a telegram from West Wittering requesting a clutch universal joint. | 1st Jul 1926 | Box 66 \ 4 scan0052 | |
| Interchangeability of the E.A.C. clutch arrangement parts. | 5th Jul 1926 | Box 66 \ 4 scan0053 | |
| Mr. Royce's requirements for manufacturing a clutch arrangement and flywheel. | 7th Jul 1926 | Box 66 \ 4 scan0054 | |
| Proposed new lubrication method for the clutch operating shaft. | 16th Jul 1926 | Box 66 \ 4 scan0055 | |
| Redesigning the Phantom Clutch to reduce flywheel weight and overall cost. | 16th Jul 1926 | Box 66 \ 4 scan0056 | |
| Features of the improved, lightened, and simplified Phantom Clutch No. 4. | 21th Jul 1926 | Box 66 \ 4 scan0057 | |
| Proposal by Mr. Royce to use Kelmit metal bushes with small flanges to prevent squeaking in the Phantom clutch lever fulcrums. | 1st Jul 1926 | Box 66 \ 4 scan0058 | |
| Running experimental chassis engines with plain parallel bolts on the crankshaft. | 13th Aug 1926 | Box 66 \ 4 scan0059 | |
| Test report on the clutch of the MX-1 first O.H. valve test car after 14,000 miles. | 20th Sep 1926 | Box 66 \ 4 scan0060 | |
| Proposal to introduce a simple internal and external gear coupling to reduce wear in the clutch. | 20th Sep 1926 | Box 66 \ 4 scan0061 | |
| Trial of a serrated drive on the Phantom clutch coupling shaft and its modification. | 2nd Oct 1926 | Box 66 \ 4 scan0062 | |
| The proposal to test Phantom Clutch No.4 using the existing clutch casing. | 10th Oct 1936 | Box 66 \ 4 scan0063 | |
| Internal works note regarding sending dampers and other parts with specific fitting instructions. | 1st Oct 1926 | Box 66 \ 4 scan0064 | |
| Clutch, a report for final decision, and arranging shipment of hydraulic pump shock absorbers. | 1st Oct 1926 | Box 66 \ 4 scan0065 | |
| Copy of a cable regarding a new clutch design and an order for a hydraulic pump and shock absorbers. | 18th Oct 1926 | Box 66 \ 4 scan0066 | |
| Introduction of a lightened clutch for Phantom cars and the dispatch of hydraulic shock absorbers. | 19th Oct 1926 | Box 66 \ 4 scan0067 | |
| Cablegram from the US to UK factory regarding production issues with clutches for the Phantom type. | 26th Oct 1926 | Box 66 \ 4 scan0068 | |
| Telegram from Springfield, Massachusetts about a production hold-up due to clutch engagement problems with the Phantom model. | 26th Oct 1926 | Box 66 \ 4 scan0069 | |
| The dispatch of a cable about a 'USA Clutch' to Springfield. | 28th Oct 1926 | Box 66 \ 4 scan0070 | |
| Letter confirming a decoded cablegram about friction surfaces and operating levers. | 29th Oct 1926 | Box 66 \ 4 scan0071 | |
| Friction in a new front axle, including proposals for ball ends and steering pivots. | 5th Nov 1926 | Box 66 \ 4 scan0072 | |
| Letter from Maurice Olley of Rolls-Royce America to E. W. Hives regarding clutch improvements. | 6th Nov 1926 | Box 66 \ 4 scan0073 | |
| Issues with the slipper drive and friction damper on the 40/50 and 20 HP models needing improvement. | 22th Nov 1926 | Box 66 \ 4 scan0074 | |
| Cause of squeaking slipper dampers and proposing a new treatment using black lead and lanoline. | 23th Nov 1926 | Box 66 \ 4 scan0075 | |
| Inconsistent working and weakness of the slipper wheel on the 20 HP Trials Saloon, chassis GYK-10. | 29th Nov 1926 | Box 66 \ 4 scan0076 | |
| Potential weight reduction and performance improvements for the Phantom and 7-EX engines. | 10th Feb 1927 | Box 66 \ 4 scan0077 | |
| From AJS discussing further lightening of the Phantom's clutch and flywheel. | 2nd Feb 1927 | Box 66 \ 4 scan0078 | |
| Potential improvements to the Phantom clutch, including a serrated coupling design and material specifications. | 6th Mar 1927 | Box 66 \ 4 scan0079 | |
| Telegram requesting a copy of the experimental report for the number four phantom clutch. | 17th Mar 1927 | Box 66 \ 4 scan0080 | |
| Proposed modifications for a lightened and simplified clutch and flywheel design. | 17th Mar 1927 | Box 66 \ 4 scan0081 | |
| Drawing LeC. 2394 for a lightened and simplified clutch for the Phantom No.5. | 18th Mar 1927 | Box 66 \ 4 scan0082 | |
| Superiority of the new Phantom clutch over the old cone clutch, despite its higher cost. | 27th May 1927 | Box 66 \ 4 scan0083 | |
| Weight distribution to improve riding qualities and reduce pitching. | 1st Jun 1927 | Box 66 \ 4 scan0084 | |
| New serrated coupling design for the Phantom clutch on a test car. | 2nd Sep 1927 | Box 66 \ 4 scan0085 | |
| Inquiry regarding the performance of a proposed serrated coupling and lightened flywheel for the Phantom model. | 12th Sep 1927 | Box 66 \ 4 scan0086 | |
| Improvements to the Phantom and Sports Car clutch. | 13th Sep 1927 | Box 66 \ 4 scan0087 | |
| EAC.10 & 12 clutch and clutch brake design, noting alterations and points for confirmation. | 17th Sep 1927 | Box 66 \ 4 scan0088 | |
| Confirming the required material, either grey or red vulcanised fibre, for Phantom engine slipper drive friction discs. | 22th Sep 1927 | Box 66 \ 4 scan0089 | |
| Proposal to modify the 20 HP slipper flywheel to match the Phantom design and to test new friction materials. | 29th Sep 1927 | Box 66 \ 4 scan0090 | |
| Alternative materials, such as cotton duck and cork, for slipper flywheel friction discs. | 4th Oct 1927 | Box 66 \ 4 scan0091 | |
| Use of fibre and cork for friction discs in the Slipper Flywheel on 20 HP and Phantom models. | 4th Oct 1927 | Box 66 \ 4 scan0092 | |
| Modifications to the Sports Phantom slipper flywheel, including reduced diameter and changes to driving springs. | 10th Oct 1927 | Box 66 \ 4 scan0093 | |
| Improved clutch design adapted for a new crankcase and preparations for a future unit gearbox. | 22th Oct 1927 | Box 66 \ 4 scan0094 | |
| Requesting the lightening of a flywheel section to match another design. | 24th Oct 1927 | Box 66 \ 4 scan0095 | |
| Requesting to fit new clutch stop springs with a longer free length to sports cars. | 20th Dec 1927 | Box 66 \ 4 scan0096 | |
| Alteration of a spring for the clutch stop on Sports cars. | 20th Dec 1927 | Box 66 \ 4 scan0097 | |
| Issues found during testing of the new slipper wheel drive for the Phantom model. | 21th Dec 1927 | Box 66 \ 4 scan0098 | |
| Investigation into slipper drive failures on a New Phantom chassis, test No. 53-UF. | 22th Dec 1927 | Box 66 \ 4 scan0099 | |
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