| Description | Date | Identifier | |
| Letter discussing different methods for fitting fabric to cone clutches, including riveting, wire stitching, and staples. | 9th Jul 1912 | Box 74 \ 2 scan0160 | |
| Letter discussing the manufacturing challenges and progress related to cones and segment cone clutches. | 16th Sep 1912 | Box 74 \ 2 scan0161 | |
| From Mr. Barrington requesting the standardisation of the fabric-lined cone clutch. | 16th Sep 1912 | Box 74 \ 2 scan0162 | |
| Testing and standardisation of a cotton fabric cone clutch. | 19th Sep 1912 | Box 74 \ 2 scan0163 | |
| Departmental memo recommending the adoption of cotton fabric cone clutches as standard. | 26th Sep 1912 | Box 74 \ 2 scan0164 | |
| The testing and recommendation to adopt cotton fabric clutches using only staples. | 26th Sep 1912 | Box 74 \ 2 scan0165 | |
| Use and standardization of cotton fabric for cone clutches, recommending weaving with selvedges. | 27th Sep 1912 | Box 74 \ 2 scan0166 | |
| Standardisation of cotton fabric cone clutches and a suggestion from Mr Royce regarding the wire gauge for staples. | 27th Sep 1912 | Box 74 \ 2 scan0167 | |
| Departmental memo inquiring about the chassis number from which cotton fabric cone clutches using staples will become a standard part. | 27th Sep 1912 | Box 74 \ 2 scan0168 | |
| Clutch clinging and dragging issues caused by the fraying of stapled cotton fabric. | 23th Oct 1912 | Box 74 \ 2 scan0169 | |
| Recommendation to test selvedged edge material on standard cars to address issues with strained change speed levers. | 28th Oct 1912 | Box 74 \ 2 scan0170 | |
| Supply of cotton fabric cone clutches for experimental cars. | 28th Oct 1912 | Box 74 \ 2 scan0171 | |
| The standardisation and testing of cotton fabric clutches for standard cars. | 28th Oct 1912 | Box 74 \ 2 scan0172 | |
| Special parts, specifically the clutch, fitted to Chassis 2100E. | 4th Dec 1912 | Box 74 \ 2 scan0173 | |
| Potential improvements to the Ionides clutch and addressing oil retention and performance issues on the clutch for chassis 2301. | 2nd Jan 1914 | Box 74 \ 2 scan0174 | |
| Extract from a memo concerning issues with a harsh, oil-losing, fabric-lined clutch. | 13th Jan 1914 | Box 74 \ 2 scan0175 | |
| Use of fibre and cork for friction discs in the Slipper Flywheel for the 20 HP and Phantom models. | 10th Oct 1927 | Box 74 \ 2 scan0176 | |
| Alternative materials, such as cotton duck and cork, for slipper flywheel friction discs. | 4th Oct 1927 | Box 74 \ 2 scan0177 | |
| The receipt and trial of slipper flywheel friction discs made of cotton duck. | 1st Nov 1927 | Box 74 \ 2 scan0178 | |
| Promising results of slipper wheels fitted with cotton duck friction rings and requesting an order for specific models. | 7th Nov 1927 | Box 74 \ 2 scan0179 | |
| The receipt of fabric friction discs and the non-arrival of bakelite discs for a damping flywheel. | 26th Apr 1928 | Box 74 \ 2 scan0180 | |
| Letter from the American branch to the London branch regarding fabric friction discs for testing. | 5th Apr 1928 | Box 74 \ 2 scan0181 | |
| Standardisation proposal for cotton duck washers for a slipping wheel in conjunction with lighter springs. | 30th Mar 1928 | Box 74 \ 2 scan0182 | |
| Questionnaire regarding the fitting of a new part to a chassis, including costs and testing dates. | 18th May 1928 | Box 74 \ 2 scan0183 | |
| Urgent internal order request for six cotton duck washers with part number E.76547. | 18th May 1928 | Box 74 \ 2 scan0184 | |
| Note discussing two proposals for fabric friction discs for a slipper drive. | 16th Jun 1928 | Box 74 \ 2 scan0185 | |
| Performance and testing of woven discs for slipper flywheels. | 1st Jun 1928 | Box 74 \ 2 scan0186 | |
| Changing friction washer material for the 20 HP crankshaft damper slipper wheel. | 21th Nov 1928 | Box 74 \ 2 scan0187 | |
| Slipper drive failures concerning the use of cotton duck material and suggested solutions. | 1st Jan 1929 | Box 74 \ 2 scan0188 | |
| Instructions for setting the spring loading when ironing cotton duck fabric. | 29th Jan 1929 | Box 74 \ 2 scan0189 | |
| Clutch experiments and a proposal by Mr. Royce for a progressive engagement system using multiple springs. | 23th Jan 1919 | Box 74 \ 2 scan0190 | |
| From 'E' to 'E.H.' detailing Mr. Royce's suggestion to improve clutch take-up by introducing flexibility into the anchorage. | 26th Apr 1917 | Box 74 \ 2 scan0191 | |
| To Mr. Coverley regarding a blueprint for a clutch mechanism. | 24th Feb 1919 | Box 74 \ 2 scan0192 | |
| Replacement of an aluminium leather-lined clutch with a malleable cone clutch lined with Thermoid. | 2nd Apr 1919 | Box 74 \ 2 scan0193 | |
| Referring papers concerning the E. Baudaux patent clutch to the Assistant Chief Engineer for review. | 1st May 1919 | Box 74 \ 2 scan0194 | |
| Distorted movement in the 40/50 HP clutch operation, requesting a new design scheme for Mr. Royce's criticism. | 12th May 1919 | Box 74 \ 2 scan0195 | |
| List of assembled parts for Chassis 1. E.X., detailing components from the 'F' section. | 30th Jun 1919 | Box 74 \ 2 scan0196 | |
| Design of a safer, standard clutch catch to replace the recommended wooden block. | 25th Oct 1918 | Box 74 \ 2 scan0197 | |
| The design of a catch for holding the clutch out. | 25th Oct 1918 | Box 74 \ 2 scan0198 | |
| Cancelling instructions for a clutch catch mechanism following Mr. Royce's disapproval. | 1st Jan 1920 | Box 74 \ 2 scan0199 | |
| Dissatisfaction with the clutch pedal movement and proposing potential modifications. | 1st Jan 1920 | Box 74 \ 2 scan0200 | |
| Point about clutch pedal movement and the use of existing aluminium castings. | 15th Jan 1920 | Box 74 \ 2 scan0201 | |
| Ongoing issue with a leaking clutch spigot oil valve and proposed solutions. | 2nd Feb 1920 | Box 74 \ 2 scan0202 | |
| Complaint and proposed modifications for the operating pin for a clutch oil valve. | 18th Jun 1920 | Box 74 \ 2 scan0203 | |
| Continued memo with suggestions for component design alternatives, referencing scheme 398. | 18th Jun 1920 | Box 74 \ 2 scan0204 | |
| Examination and wear on a Packard clutch, with notes on other American and Hawk-Northcliffe clutches. | 6th Dec 1920 | Box 74 \ 2 scan0205 | |
| Customer-supplied wooden tee piece for holding out the clutch overnight. | 16th Dec 1920 | Box 74 \ 2 scan0206 | |
| Upcoming delivery of four distinct sets of Ferodo clutch linings. | 5th Feb 1921 | Box 74 \ 2 scan0207 | |
| Issues with the gear change mechanism, including clutch braking, gearbox oil viscosity, and transmission slack. | 25th Apr 1921 | Box 74 \ 2 scan0208 | |
| Continued memorandum discussing slack in the transmission and the irritating nature of engine misfires. | 10th Dec 1920 | Box 74 \ 2 scan0209 | |
| Adjustment of clutch brakes and related issues with gear changing. | 27th Apr 1921 | Box 74 \ 2 scan0210 | |
| Typed document discussing complaints of slack in the transmission and its relation to the firing of the engine. | 29th Apr 1921 | Box 74 \ 2 scan0211 | |
| Mr. Royce's feedback regarding a heavy clutch on the 40/50 HP model and modifications for the N. series. | 29th Apr 1921 | Box 74 \ 2 scan0212 | |
| Extract discussing oil leakage in clutch valves and recommending a standardized fix. | 13th Aug 1921 | Box 74 \ 2 scan0213 | |
| Clutch on the 4-EX car that jaggers and sticks. | 13th Apr 1923 | Box 74 \ 2 scan0214 | |
| Oil leaks from the clutch valve on American cars, attaching a copy of a letter for information. | 19th Oct 1920 | Box 74 \ 2 scan0215 | |
| Letter from Rolls-Royce of America regarding oil leaks from the clutch valve on American cars. | 28th Sep 1920 | Box 74 \ 2 scan0216 | |
| Proposed scheme for clutch and flywheel lightening on the Phantom model. | 21th Feb 1927 | Box 74 \ 2 scan0217 | |
| Testing and potential adoption of a serrated coupling for the Phantom clutch. | 6th Mar 1927 | Box 74 \ 2 scan0218 | |
| Phantom clutch, comparing its performance and cost against the older cone clutch and addressing material issues. | 27th May 1927 | Box 74 \ 2 scan0219 | |
| Chassis alteration number 4, detailing modifications to the clutch brake spring to address slow gear changes. | 21th Jan 1929 | Box 74 \ 2 scan0220 | |
| Alteration to a clutch-brake, its performance, and seeking advice on further improvements. | 19th Mar 1929 | Box 74 \ 2 scan0221 | |
| Cover letter forwarding correspondence from OY concerning the single plate clutch. | 19th Mar 1929 | Box 74 \ 2 scan0222 | |
| Letter from Rolls-Royce of America discussing unfavourable clutch performance and issues with facings on Phantom models. | 1st Mar 1929 | Box 74 \ 2 scan0223 | |
| Clutch grabbing and slipping issues, detailing potential solutions and noting severe use complaints from New York. | 1st Mar 1929 | Box 74 \ 2 scan0224 | |
| Letter discussing the use of 'Tenoid' material and comparing Silver Ghost and Phantom clutches. | 18th Mar 1929 | Box 74 \ 2 scan0225 | |
| Technical letter discussing the clutch defects of the Silver Ghost and comparing them to the Phantom model. | 13th Mar 1929 | Box 74 \ 2 scan0226 | |
| Practice of slipping the Phantom clutch and comparing its performance. | 24th Mar 1929 | Box 74 \ 2 scan0227 | |
| Repeated development of clutch 'jaggering' and 'grabbing' issues. | 12th Jun 1929 | Box 74 \ 2 scan0228 | |
| Modification to clutch fabric rings to address persistent trouble. | 28th Jun 1929 | Box 74 \ 2 scan0229 | |
| Intensive rough test of a clutch on car MX-4, resulting in its failure and fire. | 28th Jun 1929 | Box 74 \ 2 scan0230 | |
| Clutch failure analysis for Phantom cars, detailing issues with slipping and material damage. | 28th Jun 1929 | Box 74 \ 2 scan0231 | |
| Proposed test procedure for different clutch part assemblies on a dynamometer rig. | 28th Jun 1929 | Box 74 \ 2 scan0232 | |
| Clutch testing procedures under known load and slipping speed. | 8th Jul 1929 | Box 74 \ 2 scan0233 | |
| Design and friction challenges of a slipper flywheel. | 8th Jul 1929 | Box 74 \ 2 scan0234 | |
| Development of Phantom clutches following feedback from the American company. | 16th Sep 1930 | Box 74 \ 2 scan0235 | |
| Note received from the U.S.A. regarding clutch performance and brake squeaks. | 29th Nov 1930 | Box 74 \ 2 scan0236 | |
| Engine design considerations for the 'After-The-War Chassis'. | 3rd Oct 1916 | Box 74 \ 2 scan0237 | |
| Visit from Herbert Frood about the use of his asbestos-based material in plate clutches. | 21th Dec 1918 | Box 74 \ 2 scan0238 | |
| Different clutch materials, including wire-woven asbestos and a non-asbestos cotton-based alternative. | 21th Dec 1918 | Box 74 \ 2 scan0239 | |
| Impregnating fabric with emery or graphite for vehicle spring damping. | 21th Dec 1918 | Box 74 \ 2 scan0240 | |
| Test results for various materials, measuring the co-efficient of friction at 150°C and 500°C. | 12th Dec 1918 | Box 74 \ 2 scan0241 | |
| Alterations for the 40/50 HP chassis, to be applied to a new batch of 500 units. | 8th Jan 1918 | Box 74 \ 2 scan0242 | |
| Alterations and experimental work for the 40/50 HP present type chassis X.2565. | 18th Dec 1918 | Box 74 \ 2 scan0243 | |
| Design considerations for the clutch, gearbox, and back axle. | 18th Dec 1918 | Box 74 \ 2 scan0244 | |
| Alterations for the 40/50 HP chassis and the associated draughting work. | 8th Jan 1919 | Box 74 \ 2 scan0245 | |
| Alterations and experimental work for the 40/50 HP present type chassis X.2565. | 18th Dec 1918 | Box 74 \ 2 scan0246 | |
| Design changes for front flywheels, magnetos, and the air pump. | 18th Dec 1918 | Box 74 \ 2 scan0247 | |
| Confirming receipt of an arrangement drawing for a 'Chassis' Flywheel & Clutch. | 14th Feb 1919 | Box 74 \ 2 scan0248 | |
| Instruction memo regarding flywheel timing markings for the 40/50 HP chassis. | 10th Mar 1919 | Box 74 \ 2 scan0249 | |
| Modifications to clutch cones for a 40/50 HP chassis flywheel and clutch. | 22th Mar 1919 | Box 74 \ 2 scan0250 | |
| Standardising the Clutch Cone for the 40/50 HP Chassis, replacing drawing G.2192 with G.6735. | 22th Mar 1919 | Box 74 \ 2 scan0251 | |
| Previous experiment on a lighter clutch and proposing further modifications for weight reduction. | 25th Mar 1919 | Box 74 \ 2 scan0252 | |
| Issues with the 40/50 clutch's aluminium oil retaining ring and recommending a design modification. | 23th May 1919 | Box 74 \ 2 scan0253 | |
| Altering the ignition markings on the flywheel for the 40/50 chassis. | 15th Aug 1919 | Box 74 \ 2 scan0254 | |
| Requesting an order for stronger experimental clutch springs for the 40/50 HP chassis. | 15th Aug 1919 | Box 74 \ 2 scan0255 | |
| Practice of holding clutches out, their lubrication, and materials. | 27th Aug 1919 | Box 74 \ 2 scan0256 | |
| The clutch brake, gear changing techniques, and a new retaining ring for clutch oil. | 27th Aug 1919 | Box 74 \ 2 scan0257 | |
| Extract listing new parts fitted to the 40/50 chassis compared to the pre-war version. | 27th Aug 1919 | Box 74 \ 2 scan0258 | |
| Extract listing a new part fitted to the 40/50 chassis compared to the pre-war 40/50 HP chassis. | 27th Aug 1919 | Box 74 \ 2 scan0259 | |
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