| Description | Date | Identifier | |
| Customer complaint about the revolution counter and speedometer and a proposed exchange. | 13th Apr 1934 | Box 59 \ 1 Scan059 | |
| Lighting system failure for Chassis B-131-BL, detailing the owner's complaint, rectification, and general remarks on the cause. | 5th Nov 1934 | Box 59 \ 1 Scan060 | |
| Lighting system failure and incorrect fuse usage on chassis B-131-BL. | 6th Nov 1934 | Box 59 \ 1 Scan061 | |
| Summary of customer complaints regarding clocks, petrol gauges, and speedometers on various models. | 7th Dec 1935 | Box 59 \ 1 Scan062 | |
| Phantom III ammeter complaint detailing electrical discharge issues and a proposed solution. | 15th Sep 1936 | Box 59 \ 1 Scan063 | |
| Battery over-charging issues and proposing an automatic volt-operated cutout as a solution. | 9th Jun 1926 | Box 59 \ 1 Scan064 | |
| Customer's complaint about battery overcharging issues and the proposal to add a voltmeter as an indicator. | 24th Jun 1926 | Box 59 \ 1 Scan065 | |
| Midgley cutout and controller, referencing an attached report and diagram. | 24th Jun 1926 | Box 59 \ 1 Scan066 | |
| Investigation into the dynamo control scheme of a Midgley cutout and controller. | 21th May 1926 | Box 59 \ 1 Scan067 | |
| Operation and test results of a controller armature and cutout unit. | 21th May 1926 | Box 59 \ 1 Scan068 | |
| Test results and analysis of a controller, detailing shunt and series coil performance, resistance values and magnetizing effect. | 21th May 1926 | Box 59 \ 1 Scan069 | |
| Continued report on dynamo performance tests, mentioning attached curves showing the effects of various resistances. | 4th Oct 1923 | Box 59 \ 1 Scan070 | |
| Two electrical wiring diagrams for a controller and cut-out unit. | 4th Oct 1923 | Box 59 \ 1 Scan071 | |
| Letter regarding an experimental report on chassis electrical systems, generators, and regulators. | 24th Jul 1926 | Box 59 \ 1 Scan072 | |
| Recommendations for improving generator regulation systems and replacing manual charging switches. | 8th Oct 1926 | Box 59 \ 1 Scan073 | |
| Chassis generator and regulator systems, including their performance and design objections. | 8th Oct 1926 | Box 59 \ 1 Scan074 | |
| Battery charging system characteristics and compromises between different dynamo types. | 8th Oct 1926 | Box 59 \ 1 Scan075 | |
| Adding an automatically operated electro-magnetic switch to the dynamo's field winding in the electrical system. | 8th Oct 1926 | Box 59 \ 1 Scan076 | |
| The functionality and reliability of an electrical system apparatus and relay switch. | 8th Oct 1926 | Box 59 \ 1 Scan077 | |
| Description of the dynamo charging system's operation, detailing the function of the coils and automatic switch. | 8th Oct 1926 | Box 59 \ 1 Scan078 | |
| Comparison of three devices being bench-tested as alternative propositions for the prevention of battery overcharging. | 8th Oct 1926 | Box 59 \ 1 Scan079 | |
| Comparison of three electrical devices, a voltmeter, a Mentor device, and an electro-magnetic switch, based on human operational requirements. | 8th Oct 1926 | Box 59 \ 1 Scan080 | |
| Wiring diagram for the connections of an electro-magnetic field resistance inserting switch unit for a chassis dynamo. | 19th Oct 1926 | Box 59 \ 1 Scan081 | |
| Letter to Peto & Radford regarding a customer's battery complaint and battery charging experiments. | 19th Oct 1926 | Box 59 \ 1 Scan082 | |
| The lack of a direct instrument for indicating battery charge and the proposal of an electro-magnetic solution. | 21th Oct 1926 | Box 59 \ 1 Scan083 | |
| The fitting of an automatic dynamo field resistance switch unit. | 26th Nov 1926 | Box 59 \ 1 Scan084 | |
| Letter from Peto & Radford concerning discussions with Mr. Royce about a Lucas machine, battery indicator, and battery type. | 29th Nov 1926 | Box 59 \ 1 Scan085 | |
| Follow-up memo enquiring about the results of experiments on automatic control for battery charging. | 30th Nov 1926 | Box 59 \ 1 Scan086 | |
| Updating on the progress of testing for an automatic field resistance inserting switch unit. | 11th Dec 1926 | Box 59 \ 1 Scan087 | |
| Bench tests for an automatic electro-magnetic switch designed to reduce the rate of dynamo charge. | 4th Dec 1926 | Box 59 \ 1 Scan088 | |
| Test systems and dynamo output curves for 20 HP and 40/50 HP models. | 14th Dec 1926 | Box 59 \ 1 Scan089 | |
| Continued report on chassis electrical system testing, referencing resistance units and battery performance. | 4th Dec 1926 | Box 59 \ 1 Scan090 | |
| Battery maintenance, detailing the negative effects of over-filling, leakage, and over-charging. | 4th Dec 1926 | Box 59 \ 1 Scan091 | |
| Continued discussion on a vibrator regulator's output curves for different electrical demands. | 4th Dec 1926 | Box 59 \ 1 Scan092 | |
| Simplified wiring diagram of a chassis electrical system. | 27th Oct 1926 | Box 59 \ 1 Scan093 | |
| Comparison of the operational characteristics of a Voltmeter, Mentor, and Automatic Switch. | 27th Oct 1926 | Box 59 \ 1 Scan094 | |
| Miscellaneous observations on the reduction of field current by inserting a resistance into the circuit. | 8th Nov 1926 | Box 59 \ 1 Scan095 | |
| Observations and readjustment details for an automatic regulating switch's operating voltage under hot and cold conditions. | 8th Nov 1926 | Box 59 \ 1 Scan096 | |
| Test report on a 20 HP dynamo output controller. | 11th Nov 1926 | Box 59 \ 1 Scan097 | |
| Graph showing the specified, representative, and reduced output curves for a Phantom Dynamo. | 4th Dec 1926 | Box 59 \ 1 Scan098 | |
| The despatch of an automatic electro-magnetic switch and a Mentor thermally operated switch for inspection. | 4th Dec 1926 | Box 59 \ 1 Scan099 | |
| Requesting test results for an automatic electric magnetic switch used for reducing dynamo charge rates. | 14th Dec 1926 | Box 59 \ 1 Scan100 | |
| Blueprint for an automatic electro-magnetic switch designed to reduce the dynamo charge rate. | 21th Dec 1926 | Box 59 \ 1 Scan101 | |
| Graph showing various output curves for a 20 HP dynamo. | 1st Jan 1927 | Box 59 \ 1 Scan102 | |
| The return of a sample automatic charge reducing switch and requesting Mr. Royce's feedback on it. | 1st Jan 1927 | Box 59 \ 1 Scan103 | |
| The inspection of an automatic charge reducing switch by Mr. Royce. | 2nd Jan 1927 | Box 59 \ 1 Scan104 | |
| Letter to Peto & Radford requesting advice on a suitable battery and following up on experimental automatic dynamo charge reducing switch reports. | 14th Jan 1927 | Box 59 \ 1 Scan105 | |
| The testing and observed incorrect functioning of an automatic electro-magnetic switch for reducing dynamo charge. | 22th Jan 1927 | Box 59 \ 1 Scan106 | |
| Phenomenon with the dynamo charging switch and a proposed modification to the auto-switch shunt coil. | 28th Jan 1927 | Box 59 \ 1 Scan107 | |
| The electrical connections for auto-switches and a proposal to delete the charging switch. | 4th Dec 1926 | Box 59 \ 1 Scan108 | |
| Modifying the dynamo auto-switch to prevent high voltage spikes and manage the charging rate. | 26th Jan 1927 | Box 59 \ 1 Scan109 | |
| Letter from an accumulator manufacturer discussing dynamo performance, charging rates, and an automatic charge-reducing switch. | 26th Jan 1927 | Box 59 \ 1 Scan110 | |
| Continuation of a letter from Peto & Radford to E. Bowler Clark discussing batteries and gas indicators. | 26th Jan 1927 | Box 59 \ 1 Scan111 | |
| Letter to Mr. Minchin discussing various car electrical components like batteries, charging rates, and points. | 27th Jan 1927 | Box 59 \ 1 Scan112 | |
| Letter discussing an auto charge reducing switch and potential improvements to battery life. | 27th Jan 1927 | Box 59 \ 1 Scan113 | |
| Modification to the electrical connection of the auto charge reducing switch. | 27th Jan 1927 | Box 59 \ 1 Scan114 | |
| Letter from an accumulator manufacturer discussing charging switches, contact points, and other battery-related matters. | 1st Feb 1927 | Box 59 \ 1 Scan115 | |
| Continuation of a letter from Peto & Radford to E. Fowler Clark Esq. | 1st Feb 1927 | Box 59 \ 1 Scan116 | |
| Extract of a memo to Mr. Minchin regarding a charging switch and awaiting feedback from Mr. Royce. | 1st Feb 1927 | Box 59 \ 1 Scan117 | |
| Simple indicator device to prevent over-charging car accumulators. | 18th Feb 1927 | Box 59 \ 1 Scan118 | |
| From EFC to RHC requesting an alteration to the auto charge reducing switch on chassis 8-EX. | 1st Mar 1927 | Box 59 \ 1 Scan119 | |
| Car accumulator overcharging and potential methods for automatic control. | 1st Mar 1927 | Box 59 \ 1 Scan120 | |
| Impracticality of a permanent experimental fitting compared to a standard volt-meter. | 9th Mar 1927 | Box 59 \ 1 Scan121 | |
| Observations from a road test of an automatic switch, detailing voltage and amperage readings under different conditions. | 9th Mar 1927 | Box 59 \ 1 Scan122 | |
| Test results for a switch, detailing voltage, current, and performance under varying temperature conditions. | 29th Jun 1920 | Box 59 \ 1 Scan123 | |
| Instructions for a road test of the dynamo controller on a P.G.II model. | 9th Mar 1927 | Box 59 \ 1 Scan124 | |
| The performance of a device, noting contact uncertainty before operation. | 29th Jun 1920 | Box 59 \ 1 Scan125 | |
| Methods for preventing the overcharging of car accumulators, comparing gassing indicators with automatic switches. | 15th Mar 1927 | Box 59 \ 1 Scan126 | |
| Continuation page of a report detailing observations on a modified auto-switch charging system. | 15th Mar 1927 | Box 59 \ 1 Scan127 | |
| Road tests of an auto-switch's operation within the vehicle's electrical charging system under various conditions. | 1st Jan 1938 | Box 59 \ 1 Scan128 | |
| Car running tests detailing dynamo output characteristics and switch operation. | 29th Sep 1926 | Box 59 \ 1 Scan129 | |
| Technical discussion on an automatic switch for regulating battery charging. | 19th Feb 1933 | Box 59 \ 1 Scan130 | |
| The characteristics of an auto-charge reducing switch, including remarks on its performance. | 19th Feb 1933 | Box 59 \ 1 Scan131 | |
| Cover sheet noting a copy of report EFC2/T15.3.27 was sent to Mr. Minchin. | 15th Mar 1927 | Box 59 \ 1 Scan132 | |
| And comparing different schemes for a charge indicator system. | 29th Mar 1927 | Box 59 \ 1 Scan133 | |
| Requesting more detailed descriptions and drawings for a charge indicator ('green lamp scheme') and a gassing indicator. | 30th Mar 1927 | Box 59 \ 1 Scan134 | |
| Letter from Peto & Radford discussing battery performance, cell gravity readings, and charging current observations. | 22th Apr 1927 | Box 59 \ 1 Scan135 | |
| Letter to E. Fowler Clark Esq. discussing a charging switch, tail lamp indicator, tungsten points and a Lucas magneto. | 22th Apr 1927 | Box 59 \ 1 Scan136 | |
| Letter discussing the performance of a special dynamo and the necessity of an auto charge reducing switch. | 27th Apr 1927 | Box 59 \ 1 Scan137 | |
| Letter discussing vehicle electrical systems, specifically charging rates, automatic switches, tail lamp indicators, and ignition points. | 28th Apr 1927 | Box 59 \ 1 Scan138 | |
| Extract from a letter from Mr. Minchin discussing a scheme and the visibility of a tail lamp indicator. | 28th Apr 1927 | Box 59 \ 1 Scan139 | |
| Letter clarifying a proposal for the operation of a charging switch and its various positions. | 30th Apr 1927 | Box 59 \ 1 Scan140 | |
| Page 2 of a letter discussing battery ignition and charging positions. | 2nd Jun 1927 | Box 59 \ 1 Scan141 | |
| Letter from Peto & Radford discussing views on an auto switch and further tests. | 2nd Jun 1927 | Box 59 \ 1 Scan142 | |
| Standardising the ignition switch for the Phantom to allow testing of the battery ignition separately from the magneto. | 3rd Jun 1927 | Box 59 \ 1 Scan143 | |
| Objections to an ignition switch arrangement and proposals for its improvement. | 3rd Jun 1927 | Box 59 \ 1 Scan144 | |
| Switchbox arrangements and modifications to the battery charging system. | 3rd Jun 1927 | Box 59 \ 1 Scan145 | |
| Continued discussion on improving electrical system commutation, dynamo, and battery performance using an automatic charge controller. | 3rd Jun 1927 | Box 59 \ 1 Scan146 | |
| Page discussing the risk of dynamo failure in relation to battery disconnection and voltage. | 8th Jun 1927 | Box 59 \ 1 Scan147 | |
| Ignition positions and charging circuit arrangement for the Phantom chassis switchbox. | 8th Jun 1927 | Box 59 \ 1 Scan148 | |
| Instructions detailing tests on the resistance for a 20 hp Dynamo Controller. | 22th Jun 1927 | Box 59 \ 1 Scan149 | |
| Test report on dynamo voltage output and contact sparking, leading to a compromise using a resistance to simulate a load. | 29th Jun 1920 | Box 59 \ 1 Scan150 | |
| Electrical characteristics of a controller, including resistance, current, voltage, and its operational behavior under test conditions. | 29th Jun 1920 | Box 59 \ 1 Scan151 | |
| Instructions regarding the performance of a dynamo, its voltage, and issues with the armature and controller. | 29th Jun 1920 | Box 59 \ 1 Scan152 | |
| Test results for a dynamo's open-circuit volts and ampere-output under specific conditions. | 29th Jun 1920 | Box 59 \ 1 Scan153 | |
| Requesting feedback on the functioning of electrical equipment, specifically switches on chassis 8-EX, 9-G3, and 10-EX. | 9th Aug 1927 | Box 59 \ 1 Scan154 | |
| Requesting feedback on the operation of the auto charge reducing switch and mentioning further experiments. | 3rd Oct 1927 | Box 59 \ 1 Scan155 | |
| New battery charging reduction scheme and the use of smaller batteries. | 1st Oct 1927 | Box 59 \ 1 Scan156 | |
| Improvements to vehicle batteries, side lights, and charging systems. | 11th Oct 1927 | Box 59 \ 1 Scan157 | |
| Chassis electrical system, specifically battery charging, danger lamps, and auto switches. | 25th Oct 1927 | Box 59 \ 1 Scan158 | |
| | | | |
