| Description | Date | Identifier | |
| Performance improvements and testing of magnetos with tungsten points. | 6th Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan209 | |
| Page 3 of a report detailing the results of a 200-hour endurance test on a magneto, including observations on performance and component wear. | 1st Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan210 | |
| Magneto endurance tests, comparing contact point materials and discussing solutions for carbon dust accumulation. | 16th Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan211 | |
| The experimental use and cost analysis of tungsten points in chassis magnetos compared to standard platinum points. | 16th Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan212 | |
| Standardisation of car dynamo armatures and charging arrangements. | 16th Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan213 | |
| Tests of a 112° long duration camshaft for the 'China' engine. | 20th Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan214 | |
| Performance comparison graph of 110°, 112°, and 116° camshafts, plotting Brake Horse Power and BMEP against engine RPM. | 19th Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan215 | |
| Blank document page with a Print Room date stamp. | 20th Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan216 | |
| Tests conducted on an Air Silencer Carburetter S.S., detailing power loss and modifications. | 20th Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan217 | |
| Power loss caused by air-silencer and carburetter modifications. | 20th Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan218 | |
| Suggested modifications to a silencer and carburetter to improve performance and reduce noise. | 6th Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan219 | |
| Graph comparing Brake Horse Power vs RPM for different Air Silencer Carburettor configurations on Engine No SS-7. | 6th Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan220 | |
| Blank document page with a 'Print Room, Derby' date stamp. | 20th Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan221 | |
| Graph plotting Brake Horse Power against RPM to show the development of an Air Silencer Carburettor. | 9th Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan222 | |
| Blank page with a purple 'Print Room' stamp. | 20th Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan223 | |
| Graph analyzing engine power losses from various air silencer carburettor configurations. | 9th Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan224 | |
| Blank page marked with a 'Print Room' receiving stamp from Derby. | 20th Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan225 | |
| Feature requests following a 10,000-mile test, including tool storage, a reverse light, and bumpers. | 23th Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan226 | |
| Test bed running of Phantom II Invar pistons, detailing issues with clearances, piston knock and recommendations for eccentric grinding. | 27th Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan227 | |
| Page 2 of a document specifying clearances and hot testing procedures for pads on a test bed. | 24th Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan228 | |
| Blueprint diagram of a piston cross-section identifying an Invar strut and areas of tightening. | 24th Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan229 | |
| Required modifications to an Air Silencer Carburetter. | 28th Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan230 | |
| Test report detailing issues and observations on various vehicle components including filters, batteries, lubrication systems, and bodywork. | 28th Dec 1929 | West Wittering \ T \ 2July1929-December1929 Scan231 | |
| Secret memo discussing engine mounting experiments to reduce vibration, and comparing 6-cylinder vs 8-cylinder engines. | 8th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan001 | |
| Secret memorandum discussing various engine mounting schemes to address roughness, based on a telegram from 'R.' detailing tests with rigid and flexible feet. | 1st May 1929 | West Wittering \ T \ January1929-February1929 Scan002 | |
| Explaining the difference in life between front and rear road springs due to stress variations. | 5th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan003 | |
| Alterations to the SS Chassis clutch system, comparing it to the 20HP and Phantom models. | 9th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan004 | |
| Agreeing to defer the 'SS. Green Lamp Scheme', a battery charge indicator, due to concerns about its cost and complexity. | 9th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan005 | |
| Use of duralumin versus aluminium castings for brake shoes on Phantom and 20HP models. | 7th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan006 | |
| With diagrams discussing the issue of water and mud ingress in 'SS' brakes and proposing solutions. | 7th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan007 | |
| Leak in the SS crankshaft's rear oil retainer and proposing a design alteration. | 1st Jan 1929 | West Wittering \ T \ January1929-February1929 Scan008 | |
| Proposal to modify a crankcase joint with a double oil flinger and drain, referencing related blueprints. | 7th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan009 | |
| Comparative analysis and diagrammatic breakdown of SS and Chrysler engine mounting systems. | 7th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan010 | |
| Engine suspension schemes, testing rubber liners and solid feet to balance engine smoothness with chassis steadiness. | 10th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan011 | |
| Bodywork and associated details for various experimental car models. | 10th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan012 | |
| Scheme for a friction-held cross member to address 'SS. Front Jellying'. | 10th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan013 | |
| Proposal for strengthening the SS Shock Damper's outer casing due to fractures observed during testing. | 10th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan014 | |
| Fracture of a shock damper shaft and proposing a strengthened design scheme. | 10th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan015 | |
| Design modifications to the SS cross steering tube to improve clearance and assembly. | 1st Jan 1929 | West Wittering \ T \ January1929-February1929 Scan016 | |
| Internal memorandum discussing an order for a Close Coupled All-Weather body, including specific modifications and delivery timelines. | 2nd Jan 1929 | West Wittering \ T \ January1929-February1929 Scan017 | |
| Modifications and proposals for the speedometer drive. | 12th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan018 | |
| Addition of a rear screen to the specification for an open tourer body for chassis 23.EX. | 14th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan019 | |
| Overheating spark plugs during a 20HP 10,000-mile test and proposing engine improvements. | 18th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan020 | |
| Engine mounting solutions to address frame flexibility and vibration issues in 'SS' & 20HP cars. | 18th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan021 | |
| Design proposal for a perforated sheet rubber component with suggested dimensions and ferrules. | 18th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan022 | |
| Design memorandum with a cross-sectional drawing discussing options for mounting an engine back plate to a frame. | 16th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan023 | |
| Secret memo regarding a suggested modification to the SS rear shock damper piston. | 16th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan024 | |
| Lubrication method for a cross steering tube, specifically how oil is carried to the pads. | 16th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan025 | |
| Secret report on SS chassis engine improvements, specifically the 19-EX engine, and a suggestion to use up old Phantom parts. | 21th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan026 | |
| Experiments and suggestions for improving an SS engine's exhaust system. | 21th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan027 | |
| Status of a friction head scheme and a front shock damper scheme. | 21th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan028 | |
| Four different schemes for luggage and spare wheel arrangements on the SS model. | 17th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan029 | |
| With a diagram proposing a quieter exhaust design for the SS & 20HP cars. | 17th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan030 | |
| Different SS engine suspension schemes, including one with rubber-lined feet. | 17th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan031 | |
| Difficulties with the SS model oil filler due to its proximity to the klaxon horn, and potential short-circuit risks. | 17th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan032 | |
| Secret memo regarding the Crankshaft Rear Oil Retainer, sending drawings and seeking approval. | 18th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan033 | |
| Secret memo regarding India 4 controls, accompanying drawings LeC. 2627 and 2630. | 18th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan034 | |
| Query about raising the ignition tower by .125 inches on the India 4 model. | 18th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan035 | |
| Proposed redesign of a cast exhaust manifold, referencing blueprint LeC. 2638 and handwritten number X7230. | 19th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan036 | |
| Secret memo proposing a blueprint for main bearings without liners to overcome shop difficulties. | 19th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan037 | |
| Secret memo concerning modifications sent for SS front shock dampers. | 19th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan038 | |
| Modifications to the SS Rear Shock Damper to overcome defects discovered during testing. | 19th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan039 | |
| Progress and difficulties in the design for lowering controls on the steering column. | 19th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan040 | |
| Progress and status of various technical modifications and improvements. | 19th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan041 | |
| Mr. Minchin's feedback on his 20HP car, including suggestions for improvements and pricing. | 21th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan042 | |
| Secret memorandum concerning an improved screw head for SS carburetter mixture adjustment. | 1st Jan 1929 | West Wittering \ T \ January1929-February1929 Scan043 | |
| Secret memo discussing outstanding items and controls for the SS Production 10,000 Mile Car. | 21th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan044 | |
| 'E' to 'HS' discussing the urgency and progress of modifications for the 'SS' car. | 21th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan045 | |
| The K.S. gauge position and maximum body size, referencing scheme N. 2780 and model 19-EX. | 21th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan046 | |
| Repair method for engine main bearings involving liners and bushes. | 26th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan047 | |
| Secret memo correcting a clerical error regarding the strength percentage of SS. Shock Dampers. | 22th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan048 | |
| Secret memo regarding the exhaust system, confirming receipt of clarifying information. | 22th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan049 | |
| Proposed scheme to reduce the height of steering wheel controls. | 22th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan050 | |
| Secret memo discussing camshaft drive options for a left-hand drive chassis for the USA. | 23th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan051 | |
| Suggestion for a centralised oiling system for car spring lubrication and the possibility of patenting the idea. | 28th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan052 | |
| Lowering steering column controls and standardizing larger steering wheels. | 23th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan053 | |
| Loose water pump gland nut on the SS model and proposing a design modification. | 23th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan054 | |
| Modifications to the Dynamo Drive and Air Pump, including lubrication and sizing. | 23th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan055 | |
| Secret memorandum discussing 'SS' car and aero engine mounting designs. | 23th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan056 | |
| Bodywork details including screens, wipers, horns, and coachwork fittings. | 23th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan057 | |
| Oil pressure drop issues in the lower half crankchamber after heavy braking and proposed solutions. | 24th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan058 | |
| Proposal to incorporate drip plug lubrication into the starter motor dashpot scheme. | 24th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan059 | |
| Secret memo providing instructions on design schemes for an SS exhaust system, comparing alternatives. | 25th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan060 | |
| Design and weight of car doors on a Mulliner-Weyman body. | 26th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan061 | |
| Blueprint for a press button starter switch. | 26th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan062 | |
| Sending prints for SS engine mounting components. | 26th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan063 | |
| Design considerations for a shorter, lefthand American chassis, focusing on wheelbase and body dimensions. | 26th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan064 | |
| SS Chassis flexible coupling and the potential use of a metal universal joint. | 27th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan065 | |
| Research work and development strategy for Mr. Ricardo's compression ignition engines. | 27th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan066 | |
| Dynamo charging current issues and potential armature modifications. | 27th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan067 | |
| Planned improvements and trials for the SS and 20HP G.4 models. | 27th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan068 | |
| Investigation into the angle of servo cams and lever lengths for SS brake gear. | 27th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan069 | |
| List of drawings being sent which completes the instructions for an SS. Chassis. | 27th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan070 | |
| Accessibility of the starter motor pocket and concluding the current design provides maximum accessibility. | 28th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan071 | |
| Redesign of an accessory distribution board to include an earth terminal. | 28th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan072 | |
| Secret memo discussing the challenges of SS. engine mounting, particularly the front feet and shock damper proximity. | 28th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan073 | |
| Modifications for a luggage grid and side wheel carrier on an existing car. | 28th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan074 | |
| New proposal for the location of the SS. valve tappet guide. | 28th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan075 | |
| Change from cast iron to a steel pipe design for an exhaust manifold. | 28th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan076 | |
| Design and mounting of rear engine feet for an SS model. | 28th Jan 1929 | West Wittering \ T \ January1929-February1929 Scan077 | |
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