| Description | Date | Identifier | |
| The development and production readiness of a 20 HP starter motor. | 29th Sep 1927 | Box 56 \ 4 Scan097 | |
| Investigation into a slipping issue with the 20 HP starter motor, caused by a worn cork washer and insufficient friction. | 29th Sep 1927 | Box 56 \ 4 Scan098 | |
| Instruction regarding the standard thickness of a cork washer for a 20 HP starter motor. | 30th Sep 1927 | Box 56 \ 4 Scan099 | |
| Requesting an order for three Ferobestos clutch washers for a 20 HP experimental starter motor. | 31th Oct 1927 | Box 56 \ 4 Scan100 | |
| Investigation into the causes of failures on the 20 HP starter motor. | 24th Jun 1927 | Box 56 \ 4 Scan101 | |
| Investigation into starter unit pinion engagement failure and slipping, detailing spring and clutch modifications. | 13th Sep 1927 | Box 56 \ 4 Scan102 | |
| Letter from the American branch to the UK regarding the reliability of the 20 HP Starter Motor. | 13th Sep 1927 | Box 56 \ 4 Scan103 | |
| Specification for a stronger clutch stop spring. | 11th Nov 1927 | Box 56 \ 4 Scan104 | |
| Investigation into improved stops for a 20 HP starter, comparing single cone, ball race, and circumferential teeth types, with a proposal to standardize the circumferential teeth design. | 1st Nov 1927 | Box 56 \ 4 Scan105 | |
| Investigation into increased initial friction in a 20 HP starter pinion unit. | 1st Nov 1927 | Box 56 \ 4 Scan106 | |
| Investigation into a 20 HP starter's multiple clutch, testing different disc materials and spring loads. | 1st Nov 1927 | Box 56 \ 4 Scan107 | |
| The lubricating scheme, noting the effectiveness of Prices Motorine 'C' oil. | 21th Nov 1927 | Box 56 \ 4 Scan108 | |
| Recommending a design change for the 20 HP starter motor, incorporating circumferential teeth for the stop. | 21th Nov 1927 | Box 56 \ 4 Scan109 | |
| Tests of two schemes for a 20 HP starter motor, focusing on friction from a cork washer. | 23th Nov 1927 | Box 56 \ 4 Scan110 | |
| Clutch spring specifications and why a lighter spring cannot be used to resolve a slipping issue. | 23th Nov 1927 | Box 56 \ 4 Scan111 | |
| Recommending the standardisation of the 20 HP starter motor to a multiple clutch type. | 23th Nov 1927 | Box 56 \ 4 Scan112 | |
| The results for a 20 HP starter motor with a multiple clutch. | 23th Nov 1927 | Box 56 \ 4 Scan113 | |
| Test results for clutch components, specifically corks and Ferobestos discs, under various oily and wear conditions. | 23th Nov 1927 | Box 56 \ 4 Scan114 | |
| Tests and modifications to a drive, clutch, and starter motor to resolve grabbing and digging issues. | 21th Nov 1927 | Box 56 \ 4 Scan115 | |
| Standardisation of a modified 20 HP starter drive to improve reliability. | 21th Nov 1927 | Box 56 \ 4 Scan116 | |
| Standardisation and revision form for chassis parts, detailing costs and implementation for a new part. | 21th Feb 1928 | Box 56 \ 4 Scan117 | |
| Standardisation document for a modified starter motor drive. | 1st Mar 1928 | Box 56 \ 4 Scan118 | |
| Questionnaire detailing the introduction of a new part for the 'N' Series chassis, including test date and costs. | 3rd Sep 1928 | Box 56 \ 4 Scan119 | |
| Secret memo discussing improvements to the SS and 20 HP electrical starters. | 25th Mar 1929 | Box 56 \ 4 Scan120 | |
| Proposal for an indicator light on the instrument board to prevent damage to flywheel starter rings. | 15th Apr 1929 | Box 56 \ 4 Scan121 | |
| Referencing a note about an S.S. chassis and a previous general report. | 25th Jun 1929 | Box 56 \ 4 Scan122 | |
| Severity of damaged flywheel starter rings in England. | 28th Jun 1929 | Box 56 \ 4 Scan123 | |
| Damage to 20 HP cars from passengers treading on components. | 1st Jul 1929 | Box 56 \ 4 Scan124 | |
| Damage to starter motors and flywheel rings on 20 HP chassis. | 2nd Jul 1929 | Box 56 \ 4 Scan125 | |
| The causes of damage to 20 HP starter gear rings. | 3rd Jul 1929 | Box 56 \ 4 Scan126 | |
| Questioning the delay in producing a new switchbox design for 40/50 & 20 HP models. | 10th Nov 1925 | Box 56 \ 4 Scan127 | |
| Recommending the standardisation of stainless steel screws for the switch handle after a successful 10,000-mile test. | 27th May 1926 | Box 56 \ 4 Scan128 | |
| Instruction to introduce stainless steel screws for the switch handles on 20 HP and 40/50 HP chassis. | 31th May 1926 | Box 56 \ 4 Scan129 | |
| Inspection and testing procedures for the 20 HP Switchbox. | 19th Oct 1926 | Box 56 \ 4 Scan130 | |
| Instructions for testing electrical wiring and components. | 7th Dec 1927 | Box 56 \ 4 Scan131 | |
| Request to produce a modified 20 HP chassis switchbox by superseding specific contact makers. | 7th Dec 1927 | Box 56 \ 4 Scan132 | |
| Instruction for an experiment on a 20 HP chassis switchbox to reduce the burning of contact points. | 21th Dec 1927 | Box 56 \ 4 Scan133 | |
| Extract proposing a standard modification to switchboxes for the Phantom and 20 HP models to prevent burnt armature contacts. | 2nd Mar 1928 | Box 56 \ 4 Scan134 | |
| Modification to the switchbox for 40/50 HP & 20 HP models. | 30th Mar 1928 | Box 56 \ 4 Scan135 | |
| Confirming a modification instruction for the 20 HP & 40/50 HP switchbox. | 5th Apr 1928 | Box 56 \ 4 Scan136 | |
| Request to prepare a scheme for alterations to the switchbox on the 20 HP electrical installation for India. | 3rd Oct 1928 | Box 56 \ 4 Scan137 | |
| Scheme for alterations to the switchbox for the 20 HP chassis electrical installation for India. | 9th Oct 1928 | Box 56 \ 4 Scan138 | |
| Drawing for a 20 HP chassis switchbox, showing alterations for a green lamp scheme. | 12th Nov 1928 | Box 56 \ 4 Scan139 | |
| Switchbox modifications for a green lamp scheme. | 17th Nov 1928 | Box 56 \ 4 Scan140 | |
| Request for blueprints and an order of 4 sets of switchbox parts for an INDIA 4 unit. | 5th Dec 1928 | Box 56 \ 4 Scan141 | |
| Table outlining various switchbox arrangements for different vehicle models. | 2nd Jan 1929 | Box 56 \ 4 Scan142 | |
| Specification of production inspection and test for a switchbox applicable to the Phantom type chassis. | 2nd Jan 1929 | Box 56 \ 4 Scan143 | |
| Electrical testing procedure for various terminals and switches using a battery and lamp. | 26th Jun 1930 | Box 56 \ 4 Scan144 | |
| Requesting the switchbox from chassis 14-GIV for examination of the extended armature contact. | 26th Jun 1930 | Box 56 \ 4 Scan145 | |
| Technical memorandum discussing the switchbox and cutout arrangement, focusing on circuit breaking and spark reduction. | 11th Nov 1930 | Box 56 \ 4 Scan146 | |
| Analysis of different electrical switchbox and cutout arrangements and their performance. | 31th Dec 1930 | Box 56 \ 4 Scan147 | |
| Cross-reference note regarding the 20/25 switchbox (general). | 31th Dec 1930 | Box 56 \ 4 Scan148 | |
| Follow-up memo regarding complaints about the difficulty of replacing the distribution box cover. | 30th Oct 1925 | Box 57 \ 1 Scan001 | |
| Requesting clarification on the specific part of an apparatus that is causing a known error. | 24th Jun 1926 | Box 57 \ 1 Scan002 | |
| Specification for the inspection, adjustment, and testing of the distribution board and cutout. | 19th Oct 1926 | Box 57 \ 1 Scan003 | |
| Test procedure for a dynamo and cutout system detailing voltage, current, and resistance limits. | 19th Oct 1926 | Box 57 \ 1 Scan004 | |
| Wiring diagram for distribution board and cutout tests on a 20 HP engine. | 3rd Oct 1928 | Box 57 \ 1 Scan005 | |
| Alterations to the 20HP chassis switchbox for the India 4 electrical installation, specifically the application of a green lamp scheme. | 3rd Oct 1928 | Box 57 \ 1 Scan006 | |
| Request to produce parts for a distribution board, cutout, and green lamp switch for project 'INDIA 4'. | 30th Nov 1928 | Box 57 \ 1 Scan007 | |
| Extract from Mr. Hancock's report on the distribution board and cut-out on vehicle 14-GIV after 14,000 miles. | 5th Apr 1930 | Box 57 \ 1 Scan008 | |
| Production issue with black-enamelling on an Armature Spring and the proposed solution of a new part. | 29th Aug 1930 | Box 57 \ 1 Scan009 | |
| Proposing a new specification for a distribution box and cut-out production test. | 29th Oct 1930 | Box 57 \ 1 Scan010 | |
| Examination of a cutout's ability to handle increased dynamo output after extensive mileage. | 13th Nov 1930 | Box 57 \ 1 Scan011 | |
| Cross-reference document for the 20/25 distribution box and cut-out. | 31th Dec 1930 | Box 57 \ 1 Scan012 | |
| Reference note for previous correspondence regarding the Goshawk II Electrical System. | 22th Sep 1925 | Box 57 \ 1 Scan013 | |
| Electrical equipment failures during a 10,000-mile test of a 20 HP model. | 22th Sep 1925 | Box 57 \ 1 Scan014 | |
| Report page detailing issues with stud alignment, ignition contact breaker points, and lamps. | 5th Oct 1925 | Box 57 \ 1 Scan015 | |
| Listing various electrical parts and their corresponding part numbers. | 5th Oct 1925 | Box 57 \ 1 Scan016 | |
| Requesting an update on actions taken regarding electrical failures from a 10,000-mile test. | 20th Nov 1925 | Box 57 \ 1 Scan017 | |
| Updates on electrical equipment, specifically the dynamo and ignition platinum points. | 20th Nov 1925 | Box 57 \ 1 Scan018 | |
| 10,000 miles test for the New Phantom, addressing oil flow onto cables and potential solutions. | 25th Nov 1925 | Box 57 \ 1 Scan019 | |
| Test report on the final peak conditions of the 20 HP chassis charging circuit. | 8th Dec 1925 | Box 57 \ 1 Scan020 | |
| Comparison of P & R and Exide battery performance in a 40/50 system, noting internal resistance and voltage figures. | 15th Jan 1926 | Box 57 \ 1 Scan021 | |
| Summary of items for possible standardisation following a 10,000 mile test in France. | 15th Jan 1926 | Box 57 \ 1 Scan022 | |
| Electrical fittings for chassis 10-GIII after 2948 miles. | 12th Apr 1926 | Box 57 \ 1 Scan023 | |
| The performance of electrical fittings on Chassis 10-GIII after a 7526-mile test. | 23th Apr 1926 | Box 57 \ 1 Scan024 | |
| The electrical fittings for Chassis 10-GIII after completing 10,027 miles. | 4th May 1926 | Box 57 \ 1 Scan025 | |
| Confirming a conversation about the standardisation of various electrical components for 40/50 and 20 HP models. | 16th May 1926 | Box 57 \ 1 Scan026 | |
| Request to remove an ammeter, distributor head, rotor, and primary winding coil from chassis 10-GIII for inspection. | 21th May 1926 | Box 57 \ 1 Scan027 | |
| Cover note for a list of items related to a 20 HP chassis 10,000 mile test on car 10-GIII. | 27th Jan 1927 | Box 57 \ 1 Scan028 | |
| List of modifications and items for a 20 HP chassis, 10-GIII, undergoing a 10,000-mile test. | 27th Jan 1927 | Box 57 \ 1 Scan029 | |
| Chassis 10-G3 after a 10,000-mile test in France. | 10th May 1927 | Box 57 \ 1 Scan030 | |
| Proposed improvements for a new 20 HP chassis. | 4th Jun 1928 | Box 57 \ 1 Scan031 | |
| Answer for the 20 HP car GLK-46 belonging to Lord Dawson of Penn. | 28th Jun 1927 | Box 57 \ 1 Scan032 | |
| Electrical system's capacity, dynamo output, and battery charging under different running conditions. | 28th Jun 1927 | Box 57 \ 1 Scan033 | |
| Continued document discussing system performance and load conditions. | 28th Jun 1927 | Box 57 \ 1 Scan034 | |
| List of suggested items for a 10,000-mile test on a new experimental 20 HP chassis. | 5th Jun 1928 | Box 57 \ 1 Scan035 | |
| Instruction of an experimental H.T. wiring system for the 20 HP India Chassis. | 26th Jul 1928 | Box 57 \ 1 Scan036 | |
| List of experimental electrical items fitted to chassis 12-GZ, detailing ignition and generator/distribution components. | 28th Aug 1928 | Box 57 \ 1 Scan037 | |
| Extract from a report from France detailing multiple electrical failures on a 20 HP car, model 18-EX. | 31th Dec 1928 | Box 57 \ 1 Scan038 | |
| Requesting the return of experimental electrical items from chassis 9-G3 upon dismantling. | 1st Jan 1929 | Box 57 \ 1 Scan039 | |
| List of items and their status for the 10,000-mile test on chassis 14-G4. | 1st Feb 1930 | Box 57 \ 1 Scan040 | |
| Status report on various electrical components for a vehicle build, including magneto, cables, dynamo, and lamps. | 1st Feb 1930 | Box 57 \ 1 Scan041 | |
| The performance of the dynamo-battery system and a two-rate charge switching scheme. | 9th Dec 1930 | Box 57 \ 1 Scan042 | |
| Dynamo output, electrical resistance settings, and battery charging performance. | 9th Dec 1930 | Box 57 \ 1 Scan043 | |
| Dynamo output curves and the establishment of a standardized basis for their comparison. | 9th Dec 1930 | Box 57 \ 1 Scan044 | |
| Dynamo output, battery charging schemes, and the desirability of an automatic resistance method. | 9th Dec 1930 | Box 57 \ 1 Scan045 | |
| Suggestion to lengthen the dynamo unit and an analysis of various output curves. | 9th Dec 1930 | Box 57 \ 1 Scan046 | |
| Graph showing output speed performance curves for a 48 coil 40/50 dynamo under three different operating conditions. | 26th Nov 1930 | Box 57 \ 1 Scan047 | |
| Graph showing output speed performance curves for a 48 coil 20/25 dynamo at 80°C. | 4th Dec 1930 | Box 57 \ 1 Scan048 | |
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