| Description | Date | Identifier | |
| Discussion of engine starting issues and a proposed solution involving a switch in the teazer circuit. | 8th Jun 1929 | Box 64 \ 4 scan0298 | |
| Specific parts awaited to proceed with starter motor system rig tests. | 8th Jun 1929 | Box 64 \ 4 scan0299 | |
| Cover memo for the specification of production adjustment, inspection and test for the S.S. Combined Main Switch & Auxiliary Switch Unit. | 2nd Jun 1929 | Box 64 \ 4 scan0300 | |
| Updated blueprint for the SS. Starter Motor Diagram of Connections. | 14th Jun 1929 | Box 64 \ 4 scan0301 | |
| Starter switch for the SS Chassis, specifically about the size of gaps. | 15th Jun 1929 | Box 64 \ 4 scan0302 | |
| Limits and gaps for the SS. Chassis Automatic Switch. | 25th Jun 1929 | Box 64 \ 4 scan0303 | |
| Specifications and production testing of gaps for duplex push button switches. | 26th Jun 1929 | Box 64 \ 4 scan0304 | |
| Observed gaps and further testing for a main and auxiliary switch unit. | 30th Jun 1929 | Box 64 \ 4 scan0305 | |
| Cover note for the production inspection and test specification for a Duplex Button Switch. | 28th Jun 1929 | Box 64 \ 4 scan0306 | |
| Request to alter a duplex push button switch according to a revised table of gaps for production. | 28th Jun 1929 | Box 64 \ 4 scan0307 | |
| Table for the gap adjustment specifications for a duplex push button switch. | 28th Jun 1929 | Box 64 \ 4 scan0308 | |
| Specification for the production, inspection, and testing of a push duplex button switch. | 28th Jun 1929 | Box 64 \ 4 scan0309 | |
| Investigation report into a burnt-out sequence starter main and auxiliary switch unit from chassis 24-WJ. | 27th Oct 1930 | Box 64 \ 4 scan0310 | |
| Urging the completion of the Duplex starter switch for chassis 27-EX. | 31th Oct 1930 | Box 64 \ 4 scan0311 | |
| Electrical experimental record sheet for a main and auxiliary switch unit with mechanical interlock for a sequence starter, Unit A, Sheet I. | 3rd Dec 1929 | Box 64 \ 4 scan0312 | |
| Electrical experimental record sheet tracking the mileage and condition of a main and auxiliary switch unit. | 3rd Nov 1930 | Box 64 \ 4 scan0313 | |
| Fault with the Phantom II chassis starter system due to an incorrectly fitted instrument board. | 12th Nov 1930 | Box 64 \ 4 scan0314 | |
| Suggesting a material modification for a revised automatic switch's spring contact assembly. | 3rd Nov 1930 | Box 64 \ 4 scan0315 | |
| Requesting the modification of an experimental switch to produce a second unit for endurance testing. | 3rd Nov 1930 | Box 64 \ 4 scan0316 | |
| Faulty automatic switch from chassis 167-XJ. | 18th Nov 1930 | Box 64 \ 4 scan0317 | |
| Test report on a sequence starter main switch unit, comparing two versions with different gauge copper contacts. | 26th Nov 1930 | Box 64 \ 4 scan0318 | |
| Switch contact testing using a chronograph and suggesting a preferred component. | 2nd Dec 1930 | Box 64 \ 4 scan0319 | |
| Test report on two prototype sequence starter main switch units, comparing different contact laminations. | 2nd Dec 1930 | Box 64 \ 4 scan0320 | |
| Proposal to modify the P.2. starter's auxiliary switch by deleting carbon contacts to reduce production costs. | 1st Dec 1930 | Box 64 \ 4 scan0321 | |
| Endurance test report for a modified starter main and auxiliary switch unit. | 15th Dec 1930 | Box 64 \ 4 scan0322 | |
| Improved condition of copper contacts after a test on a switch. | 16th Dec 1930 | Box 64 \ 4 scan0323 | |
| Request to modify the sequence starter main and auxiliary switch unit for an experimental Phantom II chassis. | 16th Dec 1930 | Box 64 \ 4 scan0324 | |
| Endurance test report on a sequence starter main switch copper laminated contact brush. | 16th Dec 1930 | Box 64 \ 4 scan0325 | |
| Cross-reference note for the Phantom II (Sequence) Starter gear. | 31th Dec 1930 | Box 64 \ 4 scan0326 | |
| Proposing a governor-controlled automatic ignition advance mechanism for both magneto and battery systems. | 18th Oct 1923 | Box 65 \ 1 scan0001 | |
| Design sketch and notes for a combined magneto and battery ignition automatic advance hydraulic relay. | 3rd Apr 1934 | Box 65 \ 1 scan0002 | |
| Description and diagrams of a double-acting, 5-piston valve arrangement. | 3rd Apr 1934 | Box 65 \ 1 scan0003 | |
| Technical notes on an automatic ignition advance mechanism, including a diagram, and considerations for piston design to prevent knocking. | 30th May 1924 | Box 65 \ 1 scan0004 | |
| Diagram illustrating the battery and magneto ignition advance curves. | 30th May 1924 | Box 65 \ 1 scan0005 | |
| Ignition systems and detonation issues in the 40/50 model, comparing different ignition setups. | 1st Jul 1924 | Box 65 \ 1 scan0006 | |
| Alterations to the ignition governor advance curve for the EAC engine. | 9th Aug 1924 | Box 65 \ 1 scan0007 | |
| Secret memo about requiring a larger hole in the crankcase for the ignition governor. | 16th Aug 1924 | Box 65 \ 1 scan0008 | |
| Table of figures showing automatic advance settings for the WAC.2 engine. | 21th Aug 1924 | Box 65 \ 1 scan0009 | |
| Sending of various curves for the EAC.II and 20 HP engines' automatic advance. | 27th Aug 1924 | Box 65 \ 1 scan0010 | |
| Continued page describing tracings and curves for various ignition systems and their application. | 27th Aug 1924 | Box 65 \ 1 scan0011 | |
| Comparison of engine performance curves using tracing paper and providing further photostat curves. | 27th Aug 1924 | Box 65 \ 1 scan0012 | |
| Sub-groups of ignition advance curves for various engines and ignition systems. | 27th Aug 1924 | Box 65 \ 1 scan0013 | |
| Instructions and analysis regarding average advance curves for various Scintilla magnetos and a 20 HP engine. | 27th Aug 1924 | Box 65 \ 1 scan0014 | |
| Battery and magneto ignition specifications and settings for the EAC.2 engine. | 27th Aug 1924 | Box 65 \ 1 scan0015 | |
| Synchronizing battery and magneto ignition advances and a formula for flick start hand control settings. | 27th Aug 1924 | Box 65 \ 1 scan0016 | |
| Technical note detailing the 20 HP battery ignition governor spring and distributor speed limits. | 27th Aug 1924 | Box 65 \ 1 scan0017 | |
| Graph showing the required ignition advance range for an E.A.C.II engine at various speeds. | 27th Aug 1924 | Box 65 \ 1 scan0018 | |
| Secret memo detailing progress and issues with the combined automatic advance for magneto and battery ignitions, along with related modifications. | 5th Sep 1924 | Box 65 \ 1 scan0019 | |
| Design of automatic advance mechanisms for battery and magneto ignition systems. | 13th Sep 1924 | Box 65 \ 1 scan0020 | |
| Blueprints, patent work for an automatic relay device, and the importance of secrecy. | 13th Sep 1924 | Box 65 \ 1 scan0021 | |
| Test results for an oil relay automatic ignition control system. | 11th Dec 1924 | Box 65 \ 1 scan0022 | |
| Difficulties encountered with the governor spring, oil relay piston, and cold oil effects. | 11th Dec 1924 | Box 65 \ 1 scan0023 | |
| Governor spring and ignition advance performance with varying oil conditions and viscosity. | 15th Dec 1924 | Box 65 \ 1 scan0024 | |
| Confirmation of a telegram from Royce to Hives regarding working clearances in the relay ignition advance. | 15th Dec 1924 | Box 65 \ 1 scan0025 | |
| Tests for an EAC Relay Ignition Governor. | 18th Dec 1924 | Box 65 \ 1 scan0026 | |
| Governor control springs, including forces, stiction, and the resulting ignition advance curve. | 18th Dec 1924 | Box 65 \ 1 scan0027 | |
| Graph of ignition advance curves obtained for an oil relay ignition governor. | 15th Dec 1924 | Box 65 \ 1 scan0028 | |
| Posing questions and suggestions regarding the performance of the E AC Relay Ignition Governor. | 22th Dec 1924 | Box 65 \ 1 scan0029 | |
| Oil relay ignition control failure and the recommended alternative ignition system. | 25th Sep 1924 | Box 65 \ 1 scan0030 | |
| Continued document page detailing ignition lever positions and retard for battery ignition systems. | 22th Dec 1924 | Box 65 \ 1 scan0031 | |
| Functionality and ignition advance curves of an Oil Relay Governor. | 23th Dec 1924 | Box 65 \ 1 scan0032 | |
| Tests for an oil relay ignition governor. | 24th Dec 1924 | Box 65 \ 1 scan0033 | |
| The EAC ignition oil relay, testing the performance of the inner piston diameter under varying conditions. | 23th Dec 1924 | Box 65 \ 1 scan0034 | |
| Piston design, comparing aluminium and steel, and discussing clearances and materials. | 23th Dec 1924 | Box 65 \ 1 scan0035 | |
| Issues with piston rod length, governor springs, and controls. | 23th Dec 1924 | Box 65 \ 1 scan0036 | |
| The fine adjustment of magneto timing via the serrated drive on the dynamo shaft. | 23th Dec 1924 | Box 65 \ 1 scan0037 | |
| Ignition advance curves obtained with the oil relay ignition governor. | 29th Dec 1924 | Box 65 \ 1 scan0038 | |
| Graph plotting oil relay advance curves for flywheel ignition against engine RPM. | 29th Dec 1924 | Box 65 \ 1 scan0039 | |
| Confirmation of a telegram detailing troubleshooting advice for relay and filter issues. | 30th Dec 1924 | Box 65 \ 1 scan0040 | |
| Telegram from Royce to Elliott with instructions for curing a relay trouble using filters and valves. | 7th Oct 1924 | Box 65 \ 1 scan0041 | |
| On a Post Office Telegram form regarding the trial of an oil system. | 21th Aug 1923 | Box 65 \ 1 scan0042 | |
| Initial tension, spring ratings, and alterations for an oil relay ignition governor. | 31th Dec 1924 | Box 65 \ 1 scan0043 | |
| Weight tolerances, modifications to pistons, piston material, and throttle governor controls. | 31th Dec 1924 | Box 65 \ 1 scan0044 | |
| The testing and performance of an oil ignition relay device. | 31th Dec 1924 | Box 65 \ 1 scan0045 | |
| Page discussing magneto drive accuracy and a proposed material change for inner pistons. | 31th Dec 1924 | Box 65 \ 1 scan0046 | |
| Selection of an ignition advance curve for the EAC engine's oil relay ignition governor. | 31th Dec 1924 | Box 65 \ 1 scan0047 | |
| Ignition advance systems, relay advance issues, and oil selection for the 'V' Series. | 31th Dec 1924 | Box 65 \ 1 scan0048 | |
| Secret memo regarding fitting a fine gauze strainer to an oil relay ignition governor. | 31th Dec 1924 | Box 65 \ 1 scan0049 | |
| Graph illustrating the effect of reduced oil pressure and increased oil temperature on ignition advance versus engine RPM. | 1st Jan 1925 | Box 65 \ 1 scan0050 | |
| Graph of ignition advance in flywheel degrees versus engine RPM for two engines with a 4-1 compression ratio. | 1st Nov 1925 | Box 65 \ 1 scan0051 | |
| Tests on an oil relay ignition governor for an EAC engine. | 2nd Jan 1925 | Box 65 \ 1 scan0052 | |
| Recommendations for the design of pistons used in the oil relay ignition governor. | 1st Jan 1924 | Box 65 \ 1 scan0053 | |
| Potential fouling issue between a lever and piston, and the results of torsion spring tests. | 1st Jan 1925 | Box 65 \ 1 scan0054 | |
| The testing of springs for an oil relay governor ignition system and their load rating. | 1st Jan 1925 | Box 65 \ 1 scan0055 | |
| Test results for an oil relay ignition advance system, focusing on piston clearances and oil leakage. | 3rd Jan 1925 | Box 65 \ 1 scan0056 | |
| The 'V' series chassis, detailing its progress and a fix for the oil relay governor. | 1st Jan 1925 | Box 65 \ 1 scan0057 | |
| Request for two modified open-wound springs for an Ignition Governor to reduce internal friction. | 20th Jan 1925 | Box 65 \ 1 scan0058 | |
| Highlighting potential wear on oil relay advance control joints and suggesting they be made larger. | 23th Jan 1925 | Box 65 \ 1 scan0059 | |
| The initial results and difficulties encountered with the EAC Oil Relay Ignition Governor. | 23th Jan 1925 | Box 65 \ 1 scan0060 | |
| Issues with the ignition advance governor, specifically friction, stiction, and clearance problems preventing full advance. | 23th Jan 1925 | Box 65 \ 1 scan0061 | |
| Suggested modifications to engine controls, including the relay lever and governor spring. | 26th Jan 1925 | Box 65 \ 1 scan0062 | |
| Letter suggesting the design of a centrifugal oil separator for the 'EAC' ignition oil relay gear to prevent failures. | 26th Jan 1925 | Box 65 \ 1 scan0063 | |
| Instructions for production regarding the oil relay ignition governor after testing governor springs. | 28th Jan 1925 | Box 65 \ 1 scan0064 | |
| Laboratory report on the viscosity tests of Sperm, Gas engine, and Lard oils at different temperatures. | 29th Jan 1925 | Box 65 \ 1 scan0065 | |
| Secret internal memo regarding instructions for oil relay ignition control and the carburetter. | 30th Jan 1925 | Box 65 \ 1 scan0066 | |
| Instructions for ignition settings and testing procedures for the oil relay ignition governor. | 28th Jan 1925 | Box 65 \ 1 scan0067 | |
| Instructions for setting the magneto ignition timing and its associated control linkages. | 28th Jan 1925 | Box 65 \ 1 scan0068 | |
| Instructions for diagnosing and adjusting the ignition advance mechanism and linkage. | 28th Jan 1925 | Box 65 \ 1 scan0069 | |
| Troubleshooting guide for an oil relay and ignition advance mechanism. | 28th Jan 1925 | Box 65 \ 1 scan0070 | |
| The effects of control stiffness and the characteristics of the ignition advance. | 28th Jan 1925 | Box 65 \ 1 scan0071 | |
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