| Description | Date | Identifier | |
| Graph plotting load against movement to determine the efficiency and hysteresis of a torsion shaft for a 20-25 front axle. | 21th Dec 1934 | Box 13 \ 1 01-page76 | |
| Photograph of a cable-operated control or brake mechanism assembly. | 21th Dec 1934 | Box 13 \ 1 01-page77 | |
| Load testing rig with a Salter's spring balance and a series of linked components under tension. | 17th Jan 1935 | Box 13 \ 1 01-page78 | |
| Modification to address oil on hand brake shoes for the Phantom II and 25 HP chassis. | 17th Jan 1935 | Box 13 \ 1 01-page79 | |
| Hand brake efficiency and oil on the brakes for the Phantom II & 25 HP chassis. | 18th Jan 1935 | Box 13 \ 1 01-page80 | |
| Blueprint diagram illustrating where a crack occurs in a cylinder head. | 5th Mar 1927 | Box 13 \ 2 02-page001 | |
| Stiffening camshafts for the rear brakes by increasing their diameter and drilling them out, comparing them to the Phantom model. | 5th Mar 1927 | Box 13 \ 2 02-page002 | |
| Sponginess in EAC. 7. rear brakes and the required modifications. | 9th May 1927 | Box 13 \ 2 02-page003 | |
| Camshaft bearings, enclosing drawing Lec.2519. | 6th Mar 1928 | Box 13 \ 2 02-page004 | |
| Material and design of camshaft bearings, suggesting aluminium alloy or magnesium. | 9th Mar 1928 | Box 13 \ 2 02-page005 | |
| Valve lift curves, required accelerations, and related drawings for an engine. | 9th May 1923 | Box 13 \ 2 02-page006 | |
| Oil leaks from the F.2.B. Chassis rocker shaft cover caused by movement during testing. | 28th Jun 1928 | Box 13 \ 2 02-page007 | |
| Widening of cams for valve gear to improve wear and lubrication. | 25th Jul 1928 | Box 13 \ 2 02-page008 | |
| Change in the manufacturing process for super sports engine timing gears. | 28th Aug 1923 | Box 13 \ 2 02-page009 | |
| Alteration to engine timing, proposing two new camshaft designs with diagrams. | 30th Aug 1928 | Box 13 \ 2 02-page010 | |
| New design for the Phantom rocker cover to prevent oil leaks and reduce tappet noise. | 9th Sep 1928 | Box 13 \ 2 02-page011 | |
| Recommending the adoption of a new Phantom Rocker Cover after testing proved it superior to the standard version which had a tendency to loosen. | 18th Sep 1928 | Box 13 \ 2 02-page012 | |
| The performance of the 'SS' engine, detailing running conditions, induction distribution, and optimal camshaft timings. | 20th Sep 1928 | Box 13 \ 2 02-page013 | |
| Comparison of 110° and 116° camshaft performance with notes on vacuum pump lubrication and tappet adjustment. | 19th Sep 1928 | Box 13 \ 2 02-page014 | |
| Power curve graph for a Super Sports Engine, comparing different camshaft configurations. | 19th Sep 1928 | Box 13 \ 2 02-page015 | |
| Technical memorandum regarding new cam forms, spring pressures, and valve lift curves for various car and aero engines. | 6th Oct 1928 | Box 13 \ 2 02-page016 | |
| From R. querying the delay on developing a longer duration cam for 'SS' engines X.7090 and X.7010. | 20th Oct 1928 | Box 13 \ 2 02-page017 | |
| Delay in completing drawings for S.S. Engine long duration cam forms. | 24th Oct 1928 | Box 13 \ 2 02-page018 | |
| Approving a tested engine unit for an urgently needed chassis, with further improvements planned for subsequent units. | 19th Sep 1928 | Box 13 \ 2 02-page019 | |
| Tests and modifications to the 'SS' engine's rocker shaft lubrication system. | 11th Nov 1923 | Box 13 \ 2 02-page020 | |
| Sketch showing the oil restriction in the rockers for a Super Sports Engine. | 12th Nov 1928 | Box 13 \ 2 02-page021 | |
| Blueprint for a modified rocker shaft with small flats for a super-sports engine. | 12th Nov 1928 | Box 13 \ 2 02-page022 | |
| Requesting modifications to the 'SS' rocker cover to incorporate changes from the latest Phantom engine. | 11th Nov 1928 | Box 13 \ 2 02-page023 | |
| Outlining proposed changes to the 'SS' valve gear lubrication system. | 13th Nov 1928 | Box 13 \ 2 02-page024 | |
| Agreement to change the 'SS' engine cam and idler wheels to a one-piece Phantom type construction. | 16th Nov 1923 | Box 13 \ 2 02-page025 | |
| Application of nitrifying hardening to various engine components. | 19th Nov 1928 | Box 13 \ 2 02-page026 | |
| Query on using copper-plating to prevent hardening on specific areas of parts during the nitrifying process. | 22th Nov 1928 | Box 13 \ 2 02-page027 | |
| Modifications to the rocker shaft lubrication for the 'S.S.' Phantom chassis. | 23th Nov 1928 | Box 13 \ 2 02-page028 | |
| Standardisation of a Phantom Rocker Cover to prevent it working loose and make an oil-tight joint. | 25th Sep 1928 | Box 13 \ 2 02-page029 | |
| Form detailing information for a new chassis part, including costs and testing schedule. | 28th Jan 1929 | Box 13 \ 2 02-page030 | |
| Camshaft design, valve lift curves, and practical considerations for improving performance. | 20th Dec 1928 | Box 13 \ 2 02-page031 | |
| Experiments and requirements for 'SS' valve rocker lubrication. | 22th Jan 1929 | Box 13 \ 2 02-page032 | |
| Various schemes for 'SS' valve rocker lubrication and issues with cold start noise. | 22th Jan 1929 | Box 13 \ 2 02-page033 | |
| Experiments with valve rocker lubrication schemes for the 'SS' engine. | 22th Jan 1929 | Box 13 \ 2 02-page034 | |
| Oil leakage from a camshaft dowel screw and a proposed solution involving a new blueprint. | 29th Jan 1929 | Box 13 \ 2 02-page035 | |
| Investigation into offsetting tappets on left-handed engines to allow for interchangeable timing gears. | 1st Feb 1929 | Box 13 \ 2 02-page036 | |
| Continued discussion on tappet mechanism design, including taper pins and camshaft lubrication. | 2nd Feb 1929 | Box 13 \ 2 02-page037 | |
| Discussion of design improvements for the 'SS' Valve Rocker Cover, addressing oil leaks, noise, and fastening issues. | 2nd Feb 1929 | Box 13 \ 2 02-page038 | |
| Suitability of a spring washer for 'SS' Camshaft Bearings and suggesting a sheet metal lock. | 3rd Feb 1929 | Box 13 \ 2 02-page039 | |
| Simplification of the engine valve rocker cover design to reduce components, cost, and noise. | 1st Feb 1929 | Box 13 \ 2 02-page040 | |
| Use of sheet metal lock washers in place of spring washers for camshaft bearings. | 8th Feb 1929 | Box 13 \ 2 02-page041 | |
| Modifications to the S.S. rear brake camshafts and associated components. | 2nd Sep 1929 | Box 13 \ 2 02-page042 | |
| Three potential schemes for improving the lubrication of the 'SS' valve gear. | 11th Feb 1929 | Box 13 \ 2 02-page043 | |
| Technical memo discussing issues and proposed improvements for the valve rocker lubrication system. | 1st Feb 1929 | Box 13 \ 2 02-page044 | |
| Suggestion for an experiment on oil flow over the camshaft, tappet mechanism, and push rods. | 11th Feb 1929 | Box 13 \ 2 02-page045 | |
| 'SS' valve rocker lubrication, discussing two schemes and advising to withhold parts pending testing. | 11th Feb 1929 | Box 13 \ 2 02-page046 | |
| And comparing seven possible design schemes for the 'SS' left-hand engine. | 15th Feb 1929 | Box 13 \ 2 02-page047 | |
| Various engine design schemes, camshaft configurations, and future development directions. | 15th Feb 1929 | Box 13 \ 2 02-page048 | |
| Alternative drive schemes, with a reference to the Silver Ghost. | 3rd May 1929 | Box 13 \ 2 02-page049 | |
| Urgent internal request to issue drawings and instructions for testing two 'SS' rocker lubrication schemes. | 3rd May 1929 | Box 13 \ 2 02-page050 | |
| Request to prepare 45° cams and G.76811 levers, while advising not to scrap existing parts due to an unresolved brake lining issue. | 19th Apr 1929 | Box 13 \ 2 02-page051 | |
| Requesting instruction for 3 camshafts for the SS, to drawing number E.77322. | 10th May 1929 | Box 13 \ 2 02-page052 | |
| Storage of experimental braking system levers and cams for potential future use. | 6th May 1929 | Box 13 \ 2 02-page053 | |
| Producing improved camshaft forms for the 20 HP car, referencing related blueprints. | 8th Jun 1929 | Box 13 \ 2 02-page054 | |
| Failure of nitro-alloy camshafts during testing and querying the order of more material. | 21th Oct 1929 | Box 13 \ 2 02-page055 | |
| Removal of a hard skin from Nitro-Alloy camshafts and ordering a second set for further testing. | 23th Oct 1929 | Box 13 \ 2 02-page056 | |
| Investigation into the cause and remedy for a camshaft squeak. | 4th Nov 1929 | Box 13 \ 2 02-page057 | |
| Trial of bronze tappet guides to address a camshaft squeak. | 6th Nov 1929 | Box 13 \ 2 02-page058 | |
| Phantom II camshaft squawks, recommending a change to solid camshafts. | 18th Feb 1930 | Box 13 \ 2 02-page059 | |
| Urgent directive to stop boring Phantom II camshafts to eliminate squeaks. | 19th Feb 1930 | Box 13 \ 2 02-page060 | |
| Instructions to restrict the production of Phantom II engine tappets in Silico Manganese steel and repurpose excess material for gudgeon pins. | 17th Mar 1930 | Box 13 \ 2 02-page061 | |
| Postscript regarding a telephone call to Firths about holding a Silico Manganese steel order. | 17th Mar 1930 | Box 13 \ 2 02-page062 | |
| Ordering case hardening nickel steel for Phantom II camshafts and tappets. | 17th Mar 1930 | Box 13 \ 2 02-page063 | |
| The dispatch and marking of steel bars for the Phantom II Camshaft and Tappet. | 22th Mar 1930 | Box 13 \ 2 02-page064 | |
| The P.2. Petrol Pump, its interchangeability, and required modifications for installation. | 9th Jul 1930 | Box 13 \ 2 02-page065 | |
| Investigation into noise from the rocker arms of a Phantom II camshaft mechanism. | 22th Aug 1930 | Box 13 \ 2 02-page066 | |
| 10,000-mile test on a camshaft, advising to produce 20 sets before standardisation. | 25th Aug 1930 | Box 13 \ 2 02-page067 | |
| Investigation into camshaft squawks on the P.2 model, identifying the cause and proposing an improved lubrication system. | 6th Dec 1930 | Box 13 \ 2 02-page068 | |
| Requesting experiments on the 40/50 HP engine, specifically altering the camshaft to increase power output. | 12th May 1931 | Box 13 \ 2 02-page069 | |
| Outlining the timeline for the production of higher lift cams for a P.2. model. | 27th May 1931 | Box 13 \ 2 02-page070 | |
| Power output and performance of three different camshafts. | 29th May 1931 | Box 13 \ 2 02-page071 | |
| Engine performance related to camshaft timing, tappet clearance, and silencer design. | 22th May 1930 | Box 13 \ 2 02-page072 | |
| Performance comparison graph for Twin Zenith versus standard chassis carburettors on the 'Japan' engine with various camshafts. | 22th May 1930 | Box 13 \ 2 02-page073 | |
| Performance graph comparing Twin Zenith and standard carburetters with 110° and 112° camshafts. | 11th Jul 1930 | Box 13 \ 2 02-page074 | |
| Engine power test results for the Phantom II and 25HP engines, highlighting requirements for improved components. | 30th May 1931 | Box 13 \ 2 02-page075 | |
| Experiments for increasing horsepower on the P.2 engine. | 3rd Jun 1931 | Box 13 \ 2 02-page076 | |
| Power increasing experiments involving different carburetters and camshafts. | 3rd Jun 1931 | Box 13 \ 2 02-page077 | |
| Engine power tests comparing different carburetter and exhaust system configurations. | 1st Jun 1931 | Box 13 \ 2 02-page078 | |
| Graph showing power loss against engine RPM for Engine No SS-15 with various standard exhaust system configurations. | 9th Jan 1930 | Box 13 \ 2 02-page079 | |
| Graph of B.M.E.P. curves for a PII standard engine with different exhaust configurations. | 5th Jun 1931 | Box 13 \ 2 02-page080 | |
| Power curve graph for a Phantom II engine comparing performance with different camshafts. | 3rd Jun 1931 | Box 13 \ 2 02-page081 | |
| Graph of Phantom II engine B.M.E.P. curves with open exhaust and 4.6:1 compression ratio, comparing camshaft types. | 5th Jun 1931 | Box 13 \ 2 02-page082 | |
| Power curve graph for a 'Standard' Phantom II engine with two test conditions. | 3rd Jun 1931 | Box 13 \ 2 02-page083 | |
| Graph of four Phantom II engine power curves taken with an open exhaust. | 3rd Jun 1931 | Box 13 \ 2 02-page084 | |
| Graph of PII BMEP curves for various engine configurations, taken with open exhaust. | 3rd Jun 1921 | Box 13 \ 2 02-page085 | |
| Outlining conclusions on camshaft design, its limitations and performance characteristics across various engines. | 5th Jun 1931 | Box 13 \ 2 02-page086 | |
| Note on determining the permissible duration of inlet valve opening for car work by referencing aero cams. | 5th Jun 1931 | Box 13 \ 2 02-page087 | |
| Camshaft design fears and suggestions for various car work engines. | 5th Jun 1931 | Box 13 \ 2 02-page088 | |
| Camshafts, compression ratios, and fuels to increase power from the P. 2 engine. | 5th Jun 1931 | Box 13 \ 2 02-page089 | |
| Practical limits of engine design, focusing on cams and valve areas for luxury cars. | 9th Jun 1931 | Box 13 \ 2 02-page090 | |
| Requesting the preparation of valve lift curves for longer duration, higher lift cams. | 10th Jun 1931 | Box 13 \ 2 02-page091 | |
| Experiments on camshafts for the Phantom II engine. | 12th Jun 1931 | Box 13 \ 2 02-page092 | |
| Engine performance testing, focusing on camshaft timing, valve design, and carburettor comparisons. | 12th Jun 1931 | Box 13 \ 2 02-page093 | |
| Technical memorandum discussing engine performance improvements with a comparison to Bentley engines. | 12th Jun 1931 | Box 13 \ 2 02-page094 | |
| Graph plotting Inlet and Exhaust Valve B.M.E.P against Engine R.P.M, showing the effect of varying tappet clearances. | 12th Jun 1931 | Box 13 \ 2 02-page095 | |
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