| Description | Date | Identifier | |
| Tests on steering problems, proposing spring modifications, and actions regarding pendulum levers. | 28th Apr 1920 | Box 20 \ 2 Scan087 | |
| Solution for Mr. Horlick's complaint by altering a trials car's steering. | 5th May 1920 | Box 20 \ 2 Scan088 | |
| Steering modifications to an open trials car and arranging a visit with Mr. Horlick. | 7th May 1920 | Box 20 \ 2 Scan089 | |
| Proposed improvements and standardization for steering systems, including pivot lean and ball ends. | 10th May 1920 | Box 20 \ 2 Scan090 | |
| Proposed scheme for a plain thrust steering column to make it less reversible. | 2nd Aug 1920 | Box 20 \ 2 Scan091 | |
| Comparison of steering performance and behaviour between experimental cars 1.EX and 6.EX. | 23th Aug 1920 | Box 20 \ 2 Scan092 | |
| Continued memo describing vehicle stability on a narrow, curved road track, analogized to a belt on a pulley. | 23th Aug 1920 | Box 20 \ 2 Scan093 | |
| Customer complaints about production cars, attributing steering issues to the American tyres being used. | 7th Sep 1920 | Box 20 \ 2 Scan094 | |
| Steering faults, including 'steering wobbles', their causes, and proposed remedies. | 7th Sep 1920 | Box 20 \ 2 Scan095 | |
| Steering at high speed, detachable rims, steering wobble, and transmission knock. | 7th Sep 1920 | Box 20 \ 2 Scan096 | |
| Suspension design, transmission issues, and electrical installation plans for a new chassis. | 19th Jul 1920 | Box 20 \ 2 Scan097 | |
| Steering complaints, detailing four possible causes for steering trouble in cars. | 9th Sep 1920 | Box 20 \ 2 Scan098 | |
| Report page discussing the causes of steering wobble and experiments to resolve the issue. | 9th Sep 1920 | Box 20 \ 2 Scan099 | |
| Wheel wobble testing, linking it to pivot alignment, and historical issues with post-war car steering. | 9th Sep 1920 | Box 20 \ 2 Scan100 | |
| Steering instability, wheel oscillation, and Mr. Royce's proposed solutions involving friction and springs. | 9th Sep 1920 | Box 20 \ 2 Scan101 | |
| Steering system experiments, detailing friction adjustments and material tests to resolve steering wobble issues. | 9th Sep 1920 | Box 20 \ 2 Scan102 | |
| The causes and potential cures for steering wobbles, including tests on wheels, tyres, and friction devices. | 9th Sep 1920 | Box 20 \ 2 Scan103 | |
| Front axle wear and the use of a plain thrust washer to manage steering friction. | 9th Sep 1920 | Box 20 \ 2 Scan104 | |
| Letter discussing chassis troubles and steering complaints, specifically relating to low-speed steering wobble. | 7th Oct 1920 | Box 20 \ 2 Scan105 | |
| The causes and potential cures for steering wobble, including tire pressure and friction devices. | 7th Oct 1920 | Box 20 \ 2 Scan106 | |
| Letter discussing steering wobble in cars, potential cures, and the effects of different components on steering sensitivity. | 24th Jan 1921 | Box 20 \ 2 Scan107 | |
| Comparison of 'Marmon' steering with the company's own central point steering system. | 24th Jan 1921 | Box 20 \ 2 Scan108 | |
| Continued discussion on steering design, comparing different wheel types and pivot arrangements. | 24th Jan 1921 | Box 20 \ 2 Scan109 | |
| Causes of road shock in steering systems and proposed modifications for all cars. | 29th Mar 1924 | Box 20 \ 2 Scan110 | |
| Danger of fitting front brakes to cars with steel artillery wheels due to steering issues caused by increased pivot over-hang. | 1st Apr 1924 | Box 20 \ 2 Scan111 | |
| Modifications to steering and suspension to mitigate road shocks, including a diagram of a pendulum lever with a friction damper. | 10th Apr 1924 | Box 20 \ 2 Scan112 | |
| Private memo from 'Ps' to 'Hs' regarding an enclosed letter about a steering mechanism. | 28th Jun 1926 | Box 20 \ 2 Scan113 | |
| Letter from a consulting engineer detailing a patent for a new hydraulic steering mechanism. | 24th Aug 1926 | Box 20 \ 2 Scan114 | |
| Voluminous French file on M. Renaudin's steering invention. | 24th Aug 1926 | Box 20 \ 2 Scan115 | |
| Declining interest in M. Renaudin's steering gear mechanism after examination. | 1st Sep 1926 | Box 20 \ 2 Scan116 | |
| Steering ratios, comparing them with competitors, and considering improvements for flexibility and comfort. | 16th Apr 1928 | Box 20 \ 2 Scan117 | |
| Data sheet on Bensport steering 'Out of centre point' measurements for various models and wheel types. | 19th May 1933 | Box 20 \ 2 Scan118 | |
| Efficiency tests of a Steering Nut with Reduced Surfaces compared to a standard nut. | 22th Nov 1933 | Box 20 \ 2 Scan119 | |
| Effects on thread contact when adjusting for wear in a nut by reducing shims. | 22th Nov 1933 | Box 20 \ 2 Scan120 | |
| Suggestion to add a square to the clutch trunnion's ball end socket for future forgings. | 21th Sep 1911 | Box 20 \ 3 Scan001 | |
| Improvements to clutch design, proposing a new arrangement with a non-combustible, non-metallic face and no oil. | 12th Oct 1911 | Box 20 \ 3 Scan002 | |
| Clutch design, comparing leather, cone, and dry plate clutches, and experiments with cotton and asbestos friction materials. | 12th Dec 1910 | Box 20 \ 3 Scan003 | |
| Request to produce six socket bolts for a clutch mechanism for experimental purposes. | 27th Oct 1911 | Box 20 \ 3 Scan004 | |
| Meeting minutes discussing the materials, storage, and testing of the cone clutch, and the progress of the plate clutch. | 1st Nov 1911 | Box 20 \ 3 Scan005 | |
| Meeting notes discussing a suggestion for clutch trunnion lubrication and the storage method for clutch leathers. | 16th Nov 1911 | Box 20 \ 3 Scan006 | |
| Urgent implementation of a new heavier flywheel as standard and the required alterations. | 27th Nov 1911 | Box 20 \ 3 Scan007 | |
| Experimental clutch ring and large flywheel test report card. | 30th Sep 1911 | Box 20 \ 3 Scan008 | |
| Requesting the addition of a second oil hole to the clutch trunnion lever C766 for improved lubrication. | 17th Nov 1911 | Box 20 \ 3 Scan009 | |
| Meeting minutes discussing the design of the C711 Clutch Trunnion socket link regarding clearance of the ball end. | 29th Nov 1911 | Box 20 \ 3 Scan010 | |
| Meeting minutes discussing a lubricating hole for a clutch lever and a clutch cone from an external supplier. | 6th Dec 1911 | Box 20 \ 3 Scan011 | |
| Meeting minutes concerning cone clutch noise, lubrication issues, and material supplied by the Scandinavian Belting Company. | 8th Dec 1911 | Box 20 \ 3 Scan012 | |
| Committee discussion on the Cone Clutch, prioritizing the lubrication of the leather clutch. | 15th Dec 1911 | Box 20 \ 3 Scan013 | |
| To Mr Spinney about standardizing the flats cut on a clutch trunnion ball socket link. | 15th Dec 1911 | Box 20 \ 3 Scan014 | |
| Copy of a meeting minute regarding the design of a C711 Clutch trunnion socket link. | 19th Dec 1911 | Box 20 \ 3 Scan015 | |
| Meeting minutes discussing the clearance in a clutch trunnion socket link and the evaluation of Renault and Crossley clutch designs. | 8th Jan 1912 | Box 20 \ 3 Scan016 | |
| Request to review the layout of the Clutch Trunnion Socket Link C711 regarding its clearance and bearing surface. | 8th Jan 1912 | Box 20 \ 3 Scan017 | |
| Departmental memo regarding a broken part from The Hon. E.S. Montagu, requesting an examination for a possible free of charge replacement. | 15th Feb 1912 | Box 20 \ 3 Scan018 | |
| Broken pieces of a ball case for a clutch trunnion, requesting an examination and report. | 14th Feb 1912 | Box 20 \ 3 Scan019 | |
| Clutch rivets catching, despite being countersunk. | 10th Jul 1912 | Box 20 \ 3 Scan020 | |
| Departmental memo chasing an overdue report from Mr Wormald regarding a broken clutch trunnion for Chassis 1331. | 21th Feb 1912 | Box 20 \ 3 Scan021 | |
| Failure of a socket bolt and arranging a technical committee meeting. | 22th Feb 1912 | Box 20 \ 3 Scan022 | |
| Departmental memo discussing the lubrication of trunion ball races and suggesting improvements. | 29th Mar 1912 | Box 20 \ 3 Scan023 | |
| Letter from F.H. Royce regarding the possibilities of using magnetic clutches in change speed boxes. | 24th Jun 1912 | Box 20 \ 3 Scan024 | |
| Departmental memo regarding a potential rectification of a clutch to be reviewed by the designers. | 3rd Jul 1912 | Box 20 \ 3 Scan025 | |
| Dirt accumulation in the flywheel guard and potential modifications to prevent clutch failure. | 8th Jul 1912 | Box 20 \ 3 Scan026 | |
| The probable cause of clutch heating and a plan for its replacement. | 25th Jul 1912 | Box 20 \ 3 Scan027 | |
| Report concerning changing the leather clutch to a fabric one on Chassis 1378 for Mrs Fitzgerald. | 25th Jul 1912 | Box 20 \ 3 Scan028 | |
| Requesting information on single plate clutches of the De Dion type. | 25th Jul 1912 | Box 20 \ 3 Scan029 | |
| To Mr. Royce regarding research into single plate clutches from competitor cars. | 30th Jul 1912 | Box 20 \ 3 Scan030 | |
| The concluding page of a typed document signed by T.S. Mercer. | 13th Aug 1912 | Box 20 \ 3 Scan031 | |
| To Mr. Royce regarding descriptions of Panhard, De Dion, and Arrol-Johnston plate clutches. | 13th Aug 1912 | Box 20 \ 3 Scan032 | |
| Small diameter clutch, noting vibration issues at certain speeds. | 14th Aug 1912 | Box 20 \ 3 Scan033 | |
| Recommendation to adopt steel clutch rings as standard following successful experimental testing. | 20th Aug 1912 | Box 20 \ 3 Scan034 | |
| The successful testing of steel clutch rings, leading to their approval for standard use. | 21th Aug 1912 | Box 20 \ 3 Scan035 | |
| Note confirming the standard use of steel clutch rings following successful testing. | 21th Aug 1912 | Box 20 \ 3 Scan036 | |
| From F.H.R. (Frederick Henry Royce) expressing satisfaction with the results of cone clutch tests on steel clutch rings. | 23th Aug 1912 | Box 20 \ 3 Scan037 | |
| The standardization of steel clutch rings for cone clutches, quoting Mr. Royce. | 26th Aug 1912 | Box 20 \ 3 Scan038 | |
| To Mr Johnson regarding a press cutting about cone clutches. | 27th Aug 1912 | Box 20 \ 3 Scan039 | |
| To Mr Bailey regarding a report from Mr Hives about steel rivets on a clutch cone showing wear on chassis 1926. | 26th Sep 1912 | Box 20 \ 3 Scan040 | |
| Extract from Mr. Platford's report on cars in the Spanish Grand Prix regarding the clutch. | 17th Sep 1914 | Box 20 \ 3 Scan041 | |
| Technical description and critique of an expanding band type clutch and a note on the gearbox. | 24th Nov 1913 | Box 20 \ 3 Scan042 | |
| Axle 'periods' or vibrations on test cars, identifying a potential solution by using a damped spring type engine coupling. | 7th Feb 1914 | Box 20 \ 3 Scan043 | |
| Issue of 'jaggering' clutches and the effect of different engine couplings and oiling. | 7th Feb 1914 | Box 20 \ 3 Scan044 | |
| Car's clutch-related 'jaggering' trouble and the resulting strain on the chassis and transmission. | 7th Feb 1914 | Box 20 \ 3 Scan045 | |
| 'axle period' issue, the refusal to pass axles with this fault, and potential solutions involving different coupling types. | 7th Feb 1914 | Box 20 \ 3 Scan046 | |
| Whether to continue sending out cars until a permanent cure for an issue is found, referencing double brake axles. | 7th Feb 1914 | Box 20 \ 3 Scan047 | |
| Clarification regarding Mr. Platford's intentions about passing axles to avoid misunderstanding. | 7th Feb 1914 | Box 20 \ 3 Scan048 | |
| Issue of axle periods and seeking a decision on engine coupling types. | 10th Sep 1936 | Box 20 \ 3 Scan049 | |
| Studying a damped spring type engine coupling to solve clutch 'jaggering' issues without stopping output. | 10th Sep 1936 | Box 20 \ 3 Scan050 | |
| Use of a damped spring type coupling to cure jaggering clutches and vibration. | 10th Sep 1936 | Box 20 \ 3 Scan051 | |
| Issues with axle 'periods' and 'jaggering' clutches, and further experimental work. | 12th Feb 1914 | Box 20 \ 3 Scan052 | |
| To Mr Hives requesting a report on axle periods and jaggering clutches. | 12th Feb 1914 | Box 20 \ 3 Scan053 | |
| To Mr Johnson regarding issues with axle periods and clutch jaggering, recommending against spring couplings and proposing further experiments. | 17th Feb 1914 | Box 20 \ 3 Scan054 | |
| To Mr Johnson about issues with axle periods and jaggering clutches. | 17th Feb 1914 | Box 20 \ 3 Scan055 | |
| Note on clutch jaggering, its cause, cure, and the consequences for the spring coupling. | 9th Sep 1916 | Box 20 \ 3 Scan056 | |
| Extract concerning the poor performance of the clutch in chassis 7-CA, comparing it to model 49-GB. | 9th Sep 1916 | Box 20 \ 3 Scan057 | |
| Inquiring about the details of the E. Baudaux patent clutch. | 8th May 1919 | Box 20 \ 3 Scan058 | |
| Test results for 'Mex' Spirit on bench engine X976. | 21th Jul 1909 | Box 20 \ 4 Scan001 | |
| Bench engine test results for 'Rupidin' spirit fuel. | 21th Jul 1909 | Box 20 \ 4 Scan002 | |
| Porcelain soot condition and jet settings. | 2nd May 1914 | Box 20 \ 4 Scan003 | |
| Customer query on the exclusive use of 'Mex'. | 2nd May 1914 | Box 20 \ 4 Scan004 | |
| Internal memorandum clarifying the use of Mex Spirit versus the superior Shell No.1 Spirit for testing cars. | 6th May 1914 | Box 20 \ 4 Scan005 | |
| Giving an opinion on a cheaper but equally good alternative. | 23th Feb 1914 | Box 20 \ 4 Scan006 | |
| Clarifying the use of Mex Spirit versus Shell No. 1 Spirit for vehicle testing purposes. | 8th May 1914 | Box 20 \ 4 Scan007 | |
| Relative effectiveness and engine detonation issues between 'Mex' and 'Pratt's' spirits. | 30th Jun 1914 | Box 20 \ 4 Scan008 | |
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