| Description | Date | Identifier | |
| Test drive report for car 12-EX, detailing performance observations and suggestions for improvement. | 22th Jul 1926 | Box 65 \ 1 scan0172 | |
| Urgently requesting details on modifications and parts for steering, aero, and oil relay systems. | 1st Aug 1926 | Box 65 \ 1 scan0173 | |
| Chassis 12-EX after a 6000-mile test, detailing the performance of the magneto, battery ignition, and ignition governor. | 19th Aug 1926 | Box 65 \ 1 scan0174 | |
| Ignition governor differences between 7-EX and 12-EX models, with a request for adjustments based on test readings. | 1st Sep 1926 | Box 65 \ 1 scan0175 | |
| Explanation of an oil relay governor ignition system, its inception, and its advantages in preventing engine detonation. | 29th Sep 1926 | Box 65 \ 1 scan0176 | |
| Engine detonation theory, particularly the impact of engine size and the use of dual ignition systems. | 29th Sep 1926 | Box 65 \ 1 scan0177 | |
| The advantages of a linked ignition system with a light governor and oil relay to prevent detonation. | 29th Sep 1926 | Box 65 \ 1 scan0178 | |
| Procedure for setting ignition timing and troubleshooting potential issues. | 29th Sep 1926 | Box 65 \ 1 scan0179 | |
| Instructions for setting the magneto timing, detailing adjustments for retard and advance positions. | 29th Sep 1926 | Box 65 \ 1 scan0180 | |
| Procedure for checking and adjusting the engine ignition advance mechanism and associated linkage. | 29th Sep 1926 | Box 65 \ 1 scan0181 | |
| Instructions for adjusting linkage movement and troubleshooting the oil relay system, including piston removal. | 29th Sep 1926 | Box 65 \ 1 scan0182 | |
| Fitting instructions and troubleshooting guide for the oil relay assembly and cup leather. | 29th Sep 1926 | Box 65 \ 1 scan0183 | |
| Page describing the characteristics of the ignition advance hand control at different speeds. | 5th Oct 1926 | Box 65 \ 1 scan0184 | |
| Technical information memo concerning the R-R Oil Relay Governor Ignition. | 5th Oct 1926 | Box 65 \ 1 scan0185 | |
| Standardisation of an ignition governor oil relay piston using metal packing rings. | 23th Sep 1926 | Box 65 \ 1 scan0186 | |
| Tests of a new ignition oil relay with metal piston rings and proposed ignition advance curves. | 9th Dec 1926 | Box 65 \ 1 scan0187 | |
| Adjustments to a piston and spring assembly for controlling initial advance, including a technical diagram. | 9th Dec 1926 | Box 65 \ 1 scan0188 | |
| Graph showing Ignition Advance on the flywheel versus RPM for an Oil Relay system. | 12th Dec 1926 | Box 65 \ 1 scan0189 | |
| Fitting instructions and modifications for a metal piston relay, including a diagram for a new collar. | 12th Dec 1926 | Box 65 \ 1 scan0190 | |
| Instructions for modifying a governor with new springs, loads, and engine timing adjustments. | 12th Dec 1926 | Box 65 \ 1 scan0191 | |
| Blueprint graph of an ignition advance curve with a diagram of an oil relay. | 23th Apr 1926 | Box 65 \ 1 scan0192 | |
| Experiments to improve the performance and reduce noise of a Phantom Ignition Governor Relay. | 23th Apr 1926 | Box 65 \ 1 scan0193 | |
| Ignition advance relay piston performance and issues with retardation. | 23th Apr 1926 | Box 65 \ 1 scan0194 | |
| Page discussing engine ignition advance modifications and material testing, including a performance graph. | 23th Apr 1926 | Box 65 \ 1 scan0195 | |
| List of alterations to the governor and relay piston for a 10,000-mile test on the 12-EX, with a corresponding ignition advance curve graph. | 23th Apr 1926 | Box 65 \ 1 scan0196 | |
| Disadvantages of light governor weights and recommending stronger control springs. | 4th Feb 1927 | Box 65 \ 1 scan0197 | |
| Feedback on a new trials car and proposed improvements for the 20 HP model, focusing on parts stock management and electrical upgrades. | 4th Feb 1927 | Box 65 \ 1 scan0198 | |
| Benefits and historical issues with the Phantom ignition auto-advance system. | 2nd May 1927 | Box 65 \ 1 scan0199 | |
| Adjustments to the ignition advance curves for an aluminium engine fitted with a turbulent head. | 6th May 1927 | Box 65 \ 1 scan0200 | |
| Blueprint graph comparing ignition advance curves for a Lighter Phantom engine, showing present, required and proposed curves. | 17th May 1927 | Box 65 \ 1 scan0201 | |
| Requesting an update on action to be taken regarding a loose nut on the Phantom's Oil Relay Filter causing engine seizure. | 17th May 1927 | Box 65 \ 1 scan0202 | |
| Phantom ignition control lever seizing due to lack of lubrication and proposed solutions. | 31th May 1927 | Box 65 \ 1 scan0203 | |
| The fitting of a Phantom ignition governor set to vehicle 10-EX. | 1st Jun 1927 | Box 65 \ 1 scan0204 | |
| Prints and stock parts for a Phantom Ignition Governor experiment. | 1st Jun 1927 | Box 65 \ 1 scan0205 | |
| New experimental locking scheme for the milled nut on the Phantom oil relay filter. | 3rd Jun 1927 | Box 65 \ 1 scan0206 | |
| Rejected proposal for a locking device and a proposed change to the ignition relay/governor. | 11th Nov 1927 | Box 65 \ 1 scan0207 | |
| Test report on leakage load for leather and brass ignition relay pistons. | 28th Jan 1928 | Box 65 \ 1 scan0208 | |
| Request to detail a new spring for the oil relay on the Continental Phantom engine. | 2nd Feb 1928 | Box 65 \ 1 scan0209 | |
| Distributing two prints of a Governor Spring for an Ignition Governor experiment. | 10th Feb 1928 | Box 65 \ 1 scan0210 | |
| Request from the American office for a plotted curve showing the altered ignition advance characteristic for an aluminum head. | 4th Aug 1928 | Box 65 \ 1 scan0211 | |
| Investigation into the cause of a seizing dynamo drive pinion bush on an 'SS' engine, detailing an experimental lubrication fix. | 30th Aug 1928 | Box 65 \ 1 scan0212 | |
| Engine testing, detailing oiling issues, modifications to drain grooves, and notes on future tests. | 30th Aug 1938 | Box 65 \ 1 scan0213 | |
| Modification to the oil drain slots in the governor housing of an S.S. Engine. | 30th Aug 1938 | Box 65 \ 1 scan0214 | |
| Blueprint detailing an experimental drain trough for an 'S.S' dynamo drive to feed oil to a bush. | 30th Aug 1938 | Box 65 \ 1 scan0215 | |
| Technical memorandum detailing the specifications for magneto and battery ignition timing and control angles. | 19th Sep 1928 | Box 65 \ 1 scan0216 | |
| Comparison table of present and proposed ignition timing settings for a Phantom engine. | 27th Sep 1928 | Box 65 \ 1 scan0217 | |
| Cover letter for an attached table and blueprint concerning Phantom ignition timing. | 28th Sep 1928 | Box 65 \ 1 scan0218 | |
| Drawing and comparing ignition timing diagrams for the Phantom engine, specifically the magneto and battery advance curves. | 2nd Oct 1928 | Box 65 \ 1 scan0219 | |
| Page 2 of a memo regarding the range of machines and a suggested alteration. | 2nd Oct 1928 | Box 65 \ 1 scan0220 | |
| Ignition timing diagram for the F.A.C. 10 engine, showing degrees of advance. | 26th Sep 1928 | Box 65 \ 1 scan0221 | |
| Comparison table of present and revised ignition timing settings for the Phantom engine. | 27th Sep 1928 | Box 65 \ 1 scan0222 | |
| Engine control drawings, covering the governor control, magneto, and ignition synchronising mechanism. | 20th Oct 1928 | Box 65 \ 1 scan0223 | |
| Cover memo regarding an attached drawing for Magneto and Throttle Governor Controls. | 25th Oct 1928 | Box 65 \ 1 scan0224 | |
| Steering, engine, and chassis issues for a new car, with suggestions for improvements, possibly for the Phantom II. | 28th Jun 1929 | Box 65 \ 1 scan0225 | |
| Engine specifications including timing, power curve data, compression ratio, and clearance volume. | 11th Jul 1929 | Box 65 \ 1 scan0226 | |
| Recommending an optimal ignition timing of 12 degrees before top dead centre to reduce detonation. | 15th Jul 1929 | Box 65 \ 1 scan0227 | |
| Graph showing power variation with ignition timing for S.S. Engines on Engine No S.S.5. | 27th Sep 1929 | Box 65 \ 1 scan0228 | |
| Complaints of the battery ignition distributor rotor working loose and rubbing against the collector pins. | 27th Sep 1929 | Box 65 \ 1 scan0229 | |
| Testing of specially hardened distributor cams using the 'cloud-burst' process. | 26th Oct 1929 | Box 65 \ 1 scan0230 | |
| Testing of specially hardened ignition distributor cams using the 'Cloudburst' process. | 30th Oct 1929 | Box 65 \ 1 scan0231 | |
| Detonation issues and recommended ignition timing adjustments for the Phantom II model. | 6th Nov 1929 | Box 65 \ 1 scan0232 | |
| Requesting a special battery ignition cam for 23-EX be hardened by the 'cloudburst' process. | 28th Jan 1930 | Box 65 \ 1 scan0233 | |
| H.T. rotor failures during endurance tests and a recommendation to increase insulation thickness due to higher compression ratios. | 20th May 1930 | Box 65 \ 1 scan0234 | |
| Request to remove the 'Cloudburst' hardened contact breaker cam from 23-EX for examination. | 7th Jun 1930 | Box 65 \ 1 scan0235 | |
| Statement clarifying the standard ignition timing for the Phantom II vehicle. | 16th Jul 1930 | Box 65 \ 1 scan0236 | |
| List of ignition timing settings in degrees for the Phantom II model. | 16th Jul 1930 | Box 65 \ 1 scan0237 | |
| Request to remove 'cloudburst' cams from experimental cars 23-EX, 19-EX, and 22-EX for examination. | 15th Aug 1930 | Box 65 \ 1 scan0238 | |
| Inquiry regarding seizure of the battery ignition contact breaker lever on its pivot. | 18th Sep 1930 | Box 65 \ 1 scan0239 | |
| The seizure of the battery ignition contact breaker lever on its pivot due to lack of lubrication. | 19th Sep 1930 | Box 65 \ 1 scan0240 | |
| The seizure of the battery ignition contact breaker lever, identifying tight bush clearance and lack of lubrication as causes. | 22th Sep 1930 | Box 65 \ 1 scan0241 | |
| Cases of the battery ignition contact lever pivot seizing due to lack of lubrication. | 23th Sep 1930 | Box 65 \ 1 scan0242 | |
| Proposing two modifications for a self-lubricating pivot pin, noting it was tested on chassis 10-G3. | 23th Sep 1930 | Box 65 \ 1 scan0243 | |
| Material selection for the battery ignition contact lever pivot to prevent corrosion and wear. | 29th Sep 1930 | Box 65 \ 1 scan0244 | |
| Delco-Remy vacuum-operated automatic ignition advance system. | 5th Oct 1931 | Box 65 \ 1 scan0245 | |
| Instruction to arrange for the fitting of a separate dynamo control scheme onto a chassis. | 22th Dec 1926 | Box 65 \ 2 scan0001 | |
| Proposal for electrical circuits, fuse arrangements, and a switchbox ignition test system. | 8th Sep 1928 | Box 65 \ 2 scan0002 | |
| Decision on a new arrangement for electrical wiring circuits, moving to a separate charging switch. | 9th Sep 1928 | Box 65 \ 2 scan0003 | |
| Sparking on the charging switch and proposing an experiment to observe it. | 22th Sep 1928 | Box 65 \ 2 scan0004 | |
| Observations and planned tests on the field break spark of a charging switch. | 25th Sep 1928 | Box 65 \ 2 scan0005 | |
| New scheme for an electrical switch to prevent destructive sparking. | 25th Sep 1928 | Box 65 \ 2 scan0006 | |
| Modifications to an ignition and charging switchbox, referencing drawing LeC. 2597. | 2nd Oct 1928 | Box 65 \ 2 scan0007 | |
| Omissions and required revisions for an SS wiring diagram. | 6th Oct 1928 | Box 65 \ 2 scan0008 | |
| Request to supply 3 sets of parts for a revised switchbox arrangement on a chassis, with manufacturing notes. | 23th Oct 1928 | Box 65 \ 2 scan0009 | |
| Parts required for the S.S. Chassis Magneto Earthing Switch. | 27th Oct 1928 | Box 65 \ 2 scan0010 | |
| New parts and blueprints for the S.S. Chassis IS switchbox. | 5th Nov 1928 | Box 65 \ 2 scan0011 | |
| Switchbox contact life tests. | 7th Nov 1928 | Box 65 \ 2 scan0012 | |
| Instruction sheet detailing burnt electrical contacts and suggesting their renewal for testing. | 8th Dec 1924 | Box 65 \ 2 scan0013 | |
| Results of switchbox contact life tests and requesting modifications for further testing. | 8th Nov 1928 | Box 65 \ 2 scan0014 | |
| Production specification and test for an EAC.10 or S.S. switchbox. | 30th Nov 1928 | Box 65 \ 2 scan0015 | |
| Production inspection and test specification for a switchbox for a 40/50 chassis. | 30th Nov 1928 | Box 65 \ 2 scan0016 | |
| Continued list of electrical testing procedures for a switch or terminal box. | 4th Jan 1929 | Box 65 \ 2 scan0017 | |
| Technical memo discussing the circuit arrangement of a green lamp charge indicator and comparing it to the old Lucas system. | 4th Jan 1929 | Box 65 \ 2 scan0018 | |
| Cancelling the specification for production, inspection and test of the EAC.10 switchbox. | 23th Jan 1929 | Box 65 \ 2 scan0019 | |
| Modification of the S.S. Chassis switchbox. | 31th Jan 1929 | Box 65 \ 2 scan0020 | |
| The specifications and differences between various switchboxes for Phantom models. | 2nd Feb 1929 | Box 65 \ 2 scan0021 | |
| The specifications and modifications of the Final S.S. Standard switchbox. | 28th Feb 1929 | Box 65 \ 2 scan0022 | |
| Results of comparative life tests for switchbox and cut-out contacts. | 28th Feb 1929 | Box 65 \ 2 scan0023 | |
| Switchbox life tests for a 20 HP unit, detailing failure modes and operations count. | 23th Feb 1929 | Box 65 \ 2 scan0024 | |
| Test report page detailing failure modes of an electrical cut-out, comparing 'Armature break first' and 'Field break first' scenarios. | 23th Feb 1929 | Box 65 \ 2 scan0025 | |
| Continuation page of a report discussing variations in setting up a switch for testing. | 1st Mar 1929 | Box 65 \ 2 scan0026 | |
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