| Description | Date | Identifier | |
| Charging current, the implementation of an auto-switch, and a separate rear lamp switch for the chassis electrical system. | 12th Oct 1927 | Box 59 \ 1 Scan159 | |
| Page 3 of a document detailing components for controlling the charging system, including a voltmeter, danger lamp, and auto switch. | 12th Oct 1927 | Box 59 \ 1 Scan160 | |
| Analysis of voltmeter positioning and the functionality of a Danger Lamp Unit, referencing a Mentor thermal switch. | 12th Oct 1927 | Box 59 \ 1 Scan161 | |
| The design and wiring of a four-terminal fault detection unit within the vehicle's electrical system. | 12th Oct 1927 | Box 59 \ 1 Scan162 | |
| The dynamo-battery system, danger lamp circuit, and auto-switch. | 8th Oct 1927 | Box 59 \ 1 Scan163 | |
| Continued discussion on wiring connections for the distribution box and associated components. | 8th Oct 1927 | Box 59 \ 1 Scan164 | |
| Chassis electrical system wiring diagram incorporating a Danger Lamp or Auto Switch Unit. | 18th Oct 1927 | Box 59 \ 1 Scan165 | |
| The unsatisfactory working of an auto switch during bench testing. | 27th Oct 1927 | Box 59 \ 1 Scan166 | |
| Analysis of an auto switch phenomenon within the charging circuit and a proposed wiring solution. | 27th Oct 1927 | Box 59 \ 1 Scan167 | |
| Modifying auto switches by adding an extra terminal for the shunt coil to enhance protection. | 27th Oct 1927 | Box 59 \ 1 Scan168 | |
| Continued discussion on the connection of the auto-switch shunt coil and issues with the vibrator regulator. | 8th Jun 1927 | Box 59 \ 1 Scan169 | |
| Proposed modification to prevent vibrator regulator action by altering the shunt coil winding. | 8th Jun 1927 | Box 59 \ 1 Scan170 | |
| Dynamo charging issues and proposed experiments on various chassis components. | 10th Nov 1927 | Box 59 \ 1 Scan171 | |
| Extract detailing how early experimental auto switches prevent dynamos from overheating. | 10th Nov 1927 | Box 59 \ 1 Scan172 | |
| Specifications for the coils used in an auto switch. | 11th Nov 1927 | Box 59 \ 1 Scan173 | |
| The successful bench test and construction of a new auto switch for regulating charging current. | 11th Nov 1927 | Box 59 \ 1 Scan174 | |
| Modifications to the dynamo charging system and electrical switch connections. | 11th Nov 1927 | Box 59 \ 1 Scan175 | |
| Analysis of different wiring configurations for the cutout shunt coil and auto switch. | 11th Nov 1927 | Box 59 \ 1 Scan176 | |
| Resolving vibration in the auto-switch and cutout by altering an electrical connection. | 11th Nov 1927 | Box 59 \ 1 Scan177 | |
| Continued report on the operation of an auto switch and cutout within a vehicle's electrical system, detailing voltage and vibration effects. | 11th Nov 1927 | Box 59 \ 1 Scan178 | |
| Analysis of an auto switch's high resistance design for voltage protection, comparing it to the Midgley arrangement. | 11th Nov 1927 | Box 59 \ 1 Scan179 | |
| Continued report on an auto-switch arrangement, comparing it to the Midgley type and considering patent implications. | 11th Nov 1927 | Box 59 \ 1 Scan180 | |
| Five potential modifications to an electrical system and the decided compromise on resistance. | 14th Nov 1927 | Box 59 \ 1 Scan181 | |
| Circuit diagram for a combined auto-switch and cut-out unit. | 14th Nov 1927 | Box 59 \ 1 Scan182 | |
| Investigating the effect of headlamp load on the operation of the electrical system and auto switch. | 17th Nov 1927 | Box 59 \ 1 Scan183 | |
| Technical comparison of a modified auto switch against Midgley and Bijur type regulators, detailing five points of difference. | 17th Nov 1927 | Box 59 \ 1 Scan184 | |
| Technical comparison of a dynamo regulator system against the Bijur apparatus, detailing differences in design and operation. | 11th Nov 1927 | Box 59 \ 1 Scan185 | |
| Auto-switch arrangement for headlamps and its integration into the existing chassis electrical system. | 11th Nov 1927 | Box 59 \ 1 Scan186 | |
| Request for 3 sets of parts for a Battery Charge Controller, listing blueprints and adjustment gaps. | 22th Nov 1927 | Box 59 \ 1 Scan187 | |
| Urgency of implementing a new auto switch or battery charge controller. | 25th Nov 1927 | Box 59 \ 1 Scan188 | |
| Covering memo from EFC to PN regarding correspondence about an Auto Switch. | 29th Nov 1927 | Box 59 \ 1 Scan189 | |
| Results of bench testing an auto switch for headlamps. | 30th Nov 1927 | Box 59 \ 1 Scan190 | |
| The development of an electrical distribution unit, discussing dynamo charging, circuit protection, and experimental units. | 30th Nov 1927 | Box 59 \ 1 Scan191 | |
| Technical document detailing variations in an electrical distribution box arrangement and its components. | 21th Nov 1927 | Box 59 \ 1 Scan192 | |
| Wiring diagram for a distribution board with a cut out and auto switch. | 21th Nov 1927 | Box 59 \ 1 Scan193 | |
| Correcting an error in the resistance winding gauge for an auto switch. | 30th Nov 1927 | Box 59 \ 1 Scan194 | |
| The fitting of a new auto charge control switch for trials in France, its design, and its patent potential. | 12th Feb 1927 | Box 59 \ 1 Scan195 | |
| Technical memorandum describing the operation of an auto switch and a potential issue with the cutout at high speeds. | 12th Dec 1927 | Box 59 \ 1 Scan196 | |
| The operation of the auto switch and a proposal to investigate a generator with a flat-top characteristic curve. | 5th Dec 1927 | Box 59 \ 1 Scan197 | |
| Requesting the swap of dynamos and an auto switch unit between experimental cars. | 5th Dec 1927 | Box 59 \ 1 Scan198 | |
| Experimental testing and patent considerations for an auto charge control switch. | 5th Dec 1927 | Box 59 \ 1 Scan199 | |
| Evaluation of a Midgley dynamo unit and comparing it to an in-house system. | 10th Dec 1927 | Box 59 \ 1 Scan200 | |
| Notes on the auto charge control switch and its planned testing on an experimental car. | 10th Dec 1927 | Box 59 \ 1 Scan201 | |
| Notes on the advantages of the electrical system, incorporating the auto charge control switch. | 9th Dec 1927 | Box 59 \ 1 Scan202 | |
| The auto switch unit, charging control, and ignition switch arrangements for the vehicle's electrical system. | 9th Dec 1927 | Box 59 \ 1 Scan203 | |
| Battery ignition testing procedures and the use of an auto switch. | 9th Dec 1927 | Box 59 \ 1 Scan204 | |
| The advantages of an auto charge control switch over the type represented by the Midgley auto switch. | 9th Dec 1927 | Box 59 \ 1 Scan205 | |
| The advantages of design changes to an electrical component, specifically regarding coils and contacts. | 9th Dec 1927 | Box 59 \ 1 Scan206 | |
| Dynamo operation, battery charging methods, and their effects on component wear and battery life. | 9th Dec 1927 | Box 59 \ 1 Scan207 | |
| Automatic switch and battery charging and maintenance. | 28th Dec 1927 | Box 59 \ 1 Scan208 | |
| Wiring diagram for an electro-magnetic field resistance inserting switch unit for a chassis dynamo. | 28th Dec 1927 | Box 59 \ 1 Scan209 | |
| Development and performance issues of an auto charge control switch on chassis 14-EX. | 12th Dec 1927 | Box 59 \ 1 Scan210 | |
| Confirming a modification to the instructions for the auto switch unit. | 12th Dec 1927 | Box 59 \ 1 Scan211 | |
| Switchbox on the 14-EX, noting an additional switch for earthing the magneto. | 13th Dec 1927 | Box 59 \ 1 Scan212 | |
| Modifications to a Battery Charge Controller to improve the rigidity of the fixed contact point. | 15th Dec 1927 | Box 59 \ 1 Scan213 | |
| Pencil sketch illustrating a bolted joint assembly with associated part numbers. | 19th Dec 1927 | Box 59 \ 1 Scan214 | |
| Letter to Mr. Minchin of Peto & Radford concerning the development of an auto switch and regulator for the electrical system. | 19th Dec 1927 | Box 59 \ 1 Scan215 | |
| Letter discussing the dynamo charging rate and requesting the return of original documents. | 21th Dec 1927 | Box 59 \ 1 Scan216 | |
| Material change from steel to brass for the winding cheeks of an auto switch. | 21th Dec 1927 | Box 59 \ 1 Scan217 | |
| Letter from Peto & Radford concerning battery charging, cut-off switches, and patents. | 22th Dec 1927 | Box 59 \ 1 Scan218 | |
| Continuation of a letter from Peto & Radford to E. Fowler Clark Esq. concerning a car battery. | 22th Dec 1927 | Box 59 \ 1 Scan219 | |
| Confirming the replacement of an auto charge control switch on chassis 9-G3. | 22th Dec 1927 | Box 59 \ 1 Scan220 | |
| Cover note for reports concerning an auto charge control switch. | 28th Dec 1927 | Box 59 \ 1 Scan221 | |
| Letter to Mr. Minchin discussing the operation and adjustment of an auto switch for battery charging. | 4th Jan 1928 | Box 59 \ 1 Scan222 | |
| Suggested modifications to the battery charge controller. | 16th Jan 1928 | Box 59 \ 1 Scan223 | |
| The performance and modification of various experimental auto switch models. | 14th Jan 1927 | Box 59 \ 1 Scan224 | |
| Hand-drawn wiring diagrams for a voltmeter and its connections. | 7th Oct 1927 | Box 59 \ 1 Scan225 | |
| List of conditions to be satisfied by a perfect auto charge reducing switch. | 7th Oct 1927 | Box 59 \ 1 Scan226 | |
| Correspondence regarding the development and testing of a Generator Auto-charge Switch. | 18th Jan 1928 | Box 59 \ 1 Scan227 | |
| Decision to fit an auto charge control switch to a Sports Car and a 12-EX test chassis. | 19th Jan 1928 | Box 59 \ 1 Scan228 | |
| The dynamo output for the 12-EX model and its compatibility with an auto switch. | 24th Jan 1928 | Box 59 \ 1 Scan229 | |
| Order for gold-silver contact points mounted on battery ignition screws. | 24th Jan 1928 | Box 59 \ 1 Scan230 | |
| Updating an auto switch on chassis 8-EX and the required wiring modifications. | 26th Jan 1928 | Box 59 \ 1 Scan231 | |
| Hand-drawn wiring diagram showing two different electrical circuit layouts. | 31th Jan 1928 | Box 59 \ 1 Scan232 | |
| Extract from a letter discussing the design and charging issues of an auto switch. | 31th Jan 1928 | Box 59 \ 1 Scan233 | |
| Instructions for modifying an auto-switch with an extra field circuit coil. | 30th Jan 1928 | Box 59 \ 1 Scan234 | |
| Test report on the adjustment of a switch for a 30 HP dynamo. | 29th Jun 1920 | Box 59 \ 1 Scan235 | |
| Test results and adjustments for a dynamo and battery system, noting voltage at various RPMs. | 29th Jun 1920 | Box 59 \ 1 Scan236 | |
| Test results for a dynamo and switch system, noting operating voltages and RPMs. | 29th Jun 1920 | Box 59 \ 1 Scan237 | |
| Test results for electrical system adjustments at various engine speeds. | 29th Jun 1920 | Box 59 \ 1 Scan238 | |
| Instructions regarding a dynamo re-closing voltage issue and the fitting of a replacement switch. | 29th Jun 1920 | Box 59 \ 1 Scan239 | |
| Letter to Mr. G.R.N. Minchin discussing the development and performance of an auto switch. | 31th Jan 1928 | Box 59 \ 1 Scan240 | |
| Dynamo operation, battery charging circuits, and the functionality of an auto switch. | 31th Jan 1928 | Box 59 \ 1 Scan241 | |
| Letter discussing battery experiments and urgently requesting pairs of 40/50 batteries in 6-volt units. | 3rd Feb 1928 | Box 59 \ 1 Scan242 | |
| Wiring diagram for an electro-magnetic field resistance inserting switch unit. | 3rd Feb 1928 | Box 59 \ 1 Scan243 | |
| Instructions for updating and adjusting an Auto-Switch E for 12 Ex. | 2nd Feb 1928 | Box 59 \ 1 Scan244 | |
| Dynamo and controller voltage settings and performance. | 29th Jun 1920 | Box 59 \ 1 Scan245 | |
| Test report and specifications for an automatic switch on chassis 15-EX. | 2nd Feb 1928 | Box 59 \ 1 Scan246 | |
| Request for an auto charge control switch suitable for a 6-volt system. | 3rd Feb 1928 | Box 59 \ 1 Scan247 | |
| Requesting a new unit and detailing the winding specifications for an auto charge control switch. | 3rd Feb 1928 | Box 59 \ 1 Scan248 | |
| Continued memorandum regarding the testing of a switch before despatch to the U.S.A. | 3rd Feb 1928 | Box 59 \ 1 Scan249 | |
| Fitting a later type of auto switch to car 8-EX for a road test. | 3rd Feb 1928 | Box 59 \ 1 Scan250 | |
| Letter from accumulator manufacturers Peto & Radford concerning auto switches and batteries. | 6th Feb 1928 | Box 59 \ 1 Scan251 | |
| Letter from Peto & Radford complaining about the inadequate design of a battery's wooden containing case. | 6th Feb 1928 | Box 59 \ 1 Scan252 | |
| Technical note detailing the winding specifications and design considerations for an auto charge control switch. | 9th Feb 1928 | Box 59 \ 1 Scan253 | |
| Design and winding directions for an auto charge control switch to be incorporated into a distribution box. | 9th Feb 1928 | Box 59 \ 1 Scan254 | |
| Explaining modifications and improvements to an auto switch unit, detailing terminal configurations. | 9th Feb 1928 | Box 59 \ 1 Scan255 | |
| The operation of an auto switch for a dynamo system, including testing, potential disadvantages, and future modifications. | 12th Dec 1927 | Box 59 \ 1 Scan256 | |
| Investigations into the Midgley unit and a temperature-related issue with the auto switch system. | 9th Feb 1928 | Box 59 \ 1 Scan257 | |
| Operation of the auto switch for battery charging under hot and cold conditions. | 9th Feb 1928 | Box 59 \ 1 Scan258 | |
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