| Description | Date | Identifier | |
| Testing procedures for the oil relay ignition governor springs and freedom of movement. | 28th Jan 1925 | Box 65 \ 1 scan0072 | |
| Assembly and testing instructions for a governor, detailing spring settings and pull force specifications. | 28th Jan 1925 | Box 65 \ 1 scan0073 | |
| Instructions for setting and testing an Oil Relay Mechanism. | 28th Jan 1925 | Box 65 \ 1 scan0074 | |
| Instructions for fitting and troubleshooting an oil relay assembly and governor, including potential ignition issues. | 28th Jan 1925 | Box 65 \ 1 scan0075 | |
| List of potential faults and their causes related to piston, lever, and governor mechanisms. | 29th Jan 1925 | Box 65 \ 1 scan0076 | |
| Blueprint showing the approximate setting of eccentrics for a hand control linkage. | 29th Jan 1925 | Box 65 \ 1 scan0077 | |
| Graph showing oil relay lever angular movement against engine and governor RPM. | 31th Jan 1925 | Box 65 \ 1 scan0078 | |
| Objections to the Scintilla magneto and alternative ignition control systems for 'V' series engines. | 31th Jan 1925 | Box 65 \ 1 scan0079 | |
| Anxieties over engine detonations from a new head design with two governors and wide-apart plugs. | 31th Jan 1925 | Box 65 \ 1 scan0080 | |
| Testing procedure for rating governor torsion springs. | 28th Jan 1925 | Box 65 \ 1 scan0081 | |
| Secret memo regarding the testing of EAC Ignition Governor Springs to determine their rating and revise production limits. | 2nd Feb 1925 | Box 65 \ 1 scan0082 | |
| Containing a telegram discussing potential issues and improvements for a gearbox. | 2nd Feb 1925 | Box 65 \ 1 scan0083 | |
| Issues and improvements for the Relay Advance and Four Speed Box. | 2nd Mar 1925 | Box 65 \ 1 scan0084 | |
| Design improvements for pinions and shafts, including tooth angle and clearances. | 5th Feb 1925 | Box 65 \ 1 scan0085 | |
| Requesting to try stronger torsional springs for the EAC ignition governor. | 5th Feb 1925 | Box 65 \ 1 scan0086 | |
| Secret memorandum regarding the automatic advance ignition mechanism and a suggested design change. | 11th Feb 1925 | Box 65 \ 1 scan0087 | |
| List of compression springs that can be used in the Relay Crosshead for the Ignition Governor. | 16th Feb 1925 | Box 65 \ 1 scan0088 | |
| Magneto and requesting a modification for springs in the oil relay. | 26th Feb 1925 | Box 65 \ 1 scan0089 | |
| Tests to prevent the inner piston in the ignition relay from sticking due to oil impurities. | 28th Feb 1925 | Box 65 \ 1 scan0090 | |
| Operational certainty of an EAC oil relay governor mechanism. | 2nd Mar 1925 | Box 65 \ 1 scan0091 | |
| Instruction book page detailing the function, cleaning, and troubleshooting procedures for the oil relay. | 3rd Mar 1925 | Box 65 \ 1 scan0092 | |
| Instructions for dismantling a relay due to grit between the pistons. | 12th Mar 1925 | Box 65 \ 1 scan0093 | |
| Secret memo requesting suggestions for laboratory tests to justify a new automatic ignition control system. | 12th Mar 1925 | Box 65 \ 1 scan0094 | |
| Suggesting a cooler for the ignition oil relay to prevent damage from high temperatures during bench tests. | 18th Mar 1925 | Box 65 \ 1 scan0095 | |
| Oil relay governor ignition system, discussing advantages over other schemes and the benefits of synchronized dual spark plugs. | 18th Mar 1925 | Box 65 \ 1 scan0096 | |
| Oil relay governor ignition, explaining the phenomenon of engine detonation. | 17th Mar 1925 | Box 65 \ 1 scan0097 | |
| Engine detonation, proposing a dual ignition system as a solution for larger engines. | 17th Mar 1925 | Box 65 \ 1 scan0098 | |
| Dual ignition system with automatic advance via an oil relay. | 17th Mar 1925 | Box 65 \ 1 scan0099 | |
| Automatic ignition controls and the inspection of car 98-NK for joint improvements. | 23th Mar 1925 | Box 65 \ 1 scan0100 | |
| Request for figures for curves for springs E.73152 and E.73203, for the Ignition Governor. | 26th Mar 1925 | Box 65 \ 1 scan0101 | |
| The failure of an oil ignition relay due to a perished cup leather from high oil temperature. | 31th Mar 1925 | Box 65 \ 1 scan0102 | |
| Instruction to omit the troublesome spring ring from future Oil Relay parts. | 3rd Apr 1925 | Box 65 \ 1 scan0103 | |
| Request to test the durability of two different types of cup leather for an oil relay at various temperatures. | 1st Apr 1925 | Box 65 \ 1 scan0104 | |
| Removal of an oil relay ignition governor from a test rig for further testing. | 9th Apr 1925 | Box 65 \ 1 scan0105 | |
| Oil relay ignition governor, detailing performance issues and proposed solutions. | 6th Apr 1925 | Box 65 \ 1 scan0106 | |
| Modifying a governor's performance curve, providing a data table of engine RPM versus lever movement. | 6th Apr 1925 | Box 65 \ 1 scan0107 | |
| Investigations of the oil relay governor. | 21th Apr 1925 | Box 65 \ 1 scan0108 | |
| Modifications to the Oil Relay Ignition Governor, focusing on inner piston clearances and foreign matter filtration. | 25th Sep 1924 | Box 65 \ 1 scan0109 | |
| Modifications to engine ignition advance and control springs. | 25th Sep 1924 | Box 65 \ 1 scan0110 | |
| Issues with a magneto sticking and the failure of cup leathers. | 25th Sep 1924 | Box 65 \ 1 scan0111 | |
| The failure of cup leathers due to high oil temperatures and viscosity changes in engines. | 25th Sep 1924 | Box 65 \ 1 scan0112 | |
| Tests for an ignition oil relay leather piston ring. | 25th Sep 1924 | Box 65 \ 1 scan0113 | |
| Graph showing the viscosity of Price's Motorine 'C' at various temperatures. | 20th Apr 1925 | Box 65 \ 1 scan0114 | |
| Graph of the ignition advance curve for an ignition relay governor, plotted against engine RPM under extreme working conditions. | 20th Apr 1925 | Box 65 \ 1 scan0115 | |
| Ignition timing specifications for automatic control, magneto, and battery systems. | 14th May 1925 | Box 65 \ 1 scan0116 | |
| Confirming a production fix by soldering the ball end on the Oil Relay Ignition Governor plunger. | 22th Jun 1925 | Box 65 \ 1 scan0117 | |
| Two experimental methods for preventing crankcase gas leakage via the ignition governor. | 31th Aug 1925 | Box 65 \ 1 scan0118 | |
| Proposed modification to the ignition control for the 40/50HP Chassis. | 3rd Sep 1925 | Box 65 \ 1 scan0119 | |
| Instructing the replacement of a magneto and spring for the oil relay ignition control on car 98-NK. | 19th Jan 1926 | Box 65 \ 1 scan0120 | |
| Removing an inner spring from the oil ignition relay due to a reduction in magneto sleeve friction. | 12th Feb 1926 | Box 65 \ 1 scan0121 | |
| Tests on the efficiency of ignition controls and an ignition oil relay. | 16th Feb 1926 | Box 65 \ 1 scan0122 | |
| Piston efficiency tests, including a diagram of the test apparatus. | 16th Feb 1926 | Box 65 \ 1 scan0123 | |
| Test report comparing the performance of different piston types and analyzing relay power. | 16th Feb 1926 | Box 65 \ 1 scan0124 | |
| The efficiency of an oil relay, detailing tests on expanding rings and the power required to operate controls. | 16th Feb 1926 | Box 65 \ 1 scan0125 | |
| Explanation of the forces and operation of the magneto hand control relay and pressure piston. | 16th Feb 1926 | Box 65 \ 1 scan0126 | |
| Investigation into piston efficiency, magneto alternatives, and the characteristics of an oil relay and ignition governor. | 16th Feb 1926 | Box 65 \ 1 scan0127 | |
| Analysis of a pressure piston system, focusing on the relationship between load, cut-off gap, leaks, and effective pressure. | 16th Feb 1926 | Box 65 \ 1 scan0128 | |
| Page discussing the significance of oil pressure and its variation with speed, including a data table. | 17th Feb 1926 | Box 65 \ 1 scan0129 | |
| Sending two blueprints of a Piston Ring for an experiment on the 40/50HP Chassis Ignition Governor. | 17th Feb 1926 | Box 65 \ 1 scan0130 | |
| Engineering drawing for a hammered piston ring for a relay piston. | 16th Feb 1926 | Box 65 \ 1 scan0131 | |
| Using models of pointers and quadrants to establish a standard for setting controls on bodied cars. | 18th Feb 1926 | Box 65 \ 1 scan0132 | |
| Experiments and suggestions for the Phantom Automatic Ignition Advance system. | 10th Mar 1926 | Box 65 \ 1 scan0133 | |
| Comparison of two alternative springs for a 40/50HP chassis ignition governor, detailing load and stress. | 12th Mar 1926 | Box 65 \ 1 scan0134 | |
| The Phantom automatic ignition advance, discussing friction and noise in the magneto. | 13th Mar 1926 | Box 65 \ 1 scan0135 | |
| Continued page discussing the causes and solutions for noise originating from magneto sleeves and control linkages. | 13th Mar 1926 | Box 65 \ 1 scan0136 | |
| The testing and development of a Lucas magneto, including noise levels and proposed modifications. | 3rd Mar 1926 | Box 65 \ 1 scan0137 | |
| Progress report on machine modifications and chassis tests, specifically concerning Lucas magnetos. | 13th Mar 1926 | Box 65 \ 1 scan0138 | |
| Diagram of timing for a Watford E06 Sleeve Magneto No 73972 and its distributor. | 25th Mar 1926 | Box 65 \ 1 scan0139 | |
| Improvements to the magneto and relay motor for the Phantom Auto: Advance system. | 30th Mar 1926 | Box 65 \ 1 scan0140 | |
| Merits of Watford magnetos and modifications to the Phantom automatic advance mechanism. | 27th Mar 1926 | Box 65 \ 1 scan0141 | |
| Continued memorandum discussing servo motor performance in relation to oil pressure and the governor. | 27th Mar 1926 | Box 65 \ 1 scan0142 | |
| Magneto's automatic advance mechanism on a Phantom model. | 30th Mar 1936 | Box 65 \ 1 scan0143 | |
| Requesting modifications for an ignition governor oil relay to complete experiments. | 7th Apr 1926 | Box 65 \ 1 scan0144 | |
| Altered blueprints for the 40/50HP Chassis Ignition Governor, specifically lengthening the relay cylinder. | 12th Apr 1926 | Box 65 \ 1 scan0145 | |
| Confirming the dispatch of blueprints for springs related to the 40/50HP Chassis ignition governor and controls. | 14th Apr 1926 | Box 65 \ 1 scan0146 | |
| Outlining a proposed scheme for the Phantom Relay Advance system, complete with a performance graph. | 18th Apr 1926 | Box 65 \ 1 scan0147 | |
| Modifications for the Ignition Governor on a 40/50HP Chassis. | 26th Apr 1926 | Box 65 \ 1 scan0148 | |
| Accompanying two blueprints for 40/50HP Chassis Ignition Governor parts. | 30th Apr 1926 | Box 65 \ 1 scan0149 | |
| Modifications to the 40/50 HP chassis ignition governor, considering cost and implementation timing. | 3rd May 1926 | Box 65 \ 1 scan0150 | |
| Phantom's automatic advance mechanism, including magneto noise, relay pistons, and governor settings. | 4th May 1926 | Box 65 \ 1 scan0151 | |
| Continued discussion on governor mechanism inefficiency with a suggested modification to the governor springing. | 4th May 1926 | Box 65 \ 1 scan0152 | |
| Continued discussion on improvements to the relay piston, governor weights and spring arrangements. | 4th May 1926 | Box 65 \ 1 scan0153 | |
| Notes and a graph analyzing engine timing advance characteristics against engine revolutions. | 1st May 1926 | Box 65 \ 1 scan0154 | |
| Concluding remarks on engine control system improvements, focusing on governors, springs, and hydraulic cylinders. | 4th May 1926 | Box 65 \ 1 scan0155 | |
| New return spring for the 40/50HP Chassis Ignition Governor. | 13th May 1926 | Box 65 \ 1 scan0156 | |
| Issue with an oil relay lever fouling a piston and subsequent adjustments. | 1st May 1926 | Box 65 \ 1 scan0157 | |
| Modifications to ignition timing and components to resolve a production issue. | 14th May 1926 | Box 65 \ 1 scan0158 | |
| Alterations required for the ignition governor for the 12-EX engine. | 14th May 1926 | Box 65 \ 1 scan0159 | |
| Extract detailing improvements to the Phantom's auto advance system, including new timing instructions and piston modifications. | 14th May 1926 | Box 65 \ 1 scan0160 | |
| Alterations required for the ignition governor for the 12-EX engine. | 14th May 1926 | Box 65 \ 1 scan0161 | |
| Updates and issues with the Phantom's automatic ignition advance system, referencing drawings and test results. | 17th May 1926 | Box 65 \ 1 scan0162 | |
| Note detailing ignition advance mechanisms and proposed modifications for the Phantom model's ignition system. | 8th May 1926 | Box 65 \ 1 scan0163 | |
| Extract detailing suggested modifications to the ignition system for Phantom Chassis models X.8770, X.8685 and X.8680. | 8th May 1926 | Box 65 \ 1 scan0164 | |
| Requesting a spare Battery Ignition Tower for EFC. | 27th May 1926 | Box 65 \ 1 scan0165 | |
| Requesting a fitter to be sent to the Experimental Electrical Lab for a Phantom ignition tower governor test. | 5th Jun 1926 | Box 65 \ 1 scan0166 | |
| From R. to H.S. regarding improvements to the automatic advance mechanism. | 10th Jun 1926 | Box 65 \ 1 scan0167 | |
| The fitting of a Phantom ignition tower for a governor test. | 10th Jun 1926 | Box 65 \ 1 scan0168 | |
| Ignition controls, advance curves, and associated drawings LeC's 2262 and 2265. | 3rd Jul 1926 | Box 65 \ 1 scan0169 | |
| Scheme for carburettor mixture control and revisions to ignition controls. | 6th Jul 1926 | Box 65 \ 1 scan0170 | |
| Preliminary tests and modifications on a new type of oil relay. | 19th Jul 1926 | Box 65 \ 1 scan0171 | |
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