| Description | Date | Identifier | |
| Letter discussing the result of changing a coil and requesting the old one be returned for examination. | 17th May 1929 | Box 57 \ 2 Scan017 | |
| Letter responding to a query about 'Delco' ignition systems, detailing the development of coils and contact points. | 17th May 1929 | Box 57 \ 2 Scan018 | |
| Page two of a letter discussing the longevity and performance of ignition coils, focusing on insulation and ballast resistance. | 21th May 1930 | Box 57 \ 2 Scan019 | |
| The return of specific parts for chassis GYL-61 for severe testing and reporting. | 21th May 1930 | Box 57 \ 2 Scan020 | |
| Returned parts for chassis GYL-61 and clarifying a previous communication. | 29th May 1930 | Box 57 \ 2 Scan021 | |
| Faulty battery ignition parts from a 20 HP Chassis, GYL-61. | 30th May 1930 | Box 57 \ 2 Scan022 | |
| Analysis of faulty battery ignition parts from a 20 HP chassis, identifying bad contact points as the likely cause of failure. | 2nd Jun 1930 | Box 57 \ 2 Scan023 | |
| Persistent ignition issues on chassis GYL-61, suggesting a deeper problem than the contact points. | 2nd Jun 1930 | Box 57 \ 2 Scan024 | |
| Responding to a request for a report on faulty battery ignition parts for chassis GYL-61. | 5th Jun 1930 | Box 57 \ 2 Scan025 | |
| Diagnostic memo on faulty battery ignition parts and potential causes for failure on a 20 HP chassis. | 5th Jun 1930 | Box 57 \ 2 Scan026 | |
| Misfire issue due to contact gap closure, proposing a distributor modification on chassis GYL-61. | 5th Jun 1930 | Box 57 \ 2 Scan027 | |
| Investigation report into engine misfiring on a 20/25 HP chassis, caused by temperature-related variations in the contact breaker gap. | 6th Jun 1930 | Box 57 \ 2 Scan028 | |
| Short typed memo regarding faulty battery ignition parts for a vehicle. | 12th Jun 1930 | Box 57 \ 2 Scan029 | |
| Return of faulty battery ignition parts for chassis GYL-61. | 6th Jun 1930 | Box 57 \ 2 Scan030 | |
| Arranging the return of faulty battery ignition parts taken from chassis GYL-61. | 6th Jun 1930 | Box 57 \ 2 Scan031 | |
| Returned parts for chassis GYL-61 and who to debit for repairs. | 14th Jul 1930 | Box 57 \ 2 Scan032 | |
| Internal memorandum regarding the allocation of repair costs for chassis GYL-61. | 8th Jul 1930 | Box 57 \ 2 Scan033 | |
| Examination report on ignition units (GLN-15), identifying faulty operation due to impurities in the coil's paraffin wax insulation. | 30th Dec 1930 | Box 57 \ 2 Scan034 | |
| The investigation of an ignition coil failure on chassis GLN-15, which occurs only when hot. | 1st Jan 1931 | Box 57 \ 2 Scan035 | |
| Letter from a repair department regarding a persistent engine misfire issue on a customer's car. | 19th Feb 1931 | Box 57 \ 2 Scan036 | |
| Complaint about a defective coil from chassis GLN.60, sent for examination and repair. | 31th Dec 1931 | Box 57 \ 2 Scan037 | |
| The dismantling and fault analysis of a non-standard experimental coil from chassis GLN.60. | 4th Jan 1932 | Box 57 \ 2 Scan038 | |
| Letter detailing an intermittent misfiring and ignition trouble with a 20 HP model car. | 14th May 1929 | Box 57 \ 2 Scan039 | |
| Letter from Peto & Radford discussing ignition trouble and the reliability of 'Delco' coils. | 16th May 1929 | Box 57 \ 2 Scan040 | |
| The examination of a faulty dynamo and cutout, identifying a bent contact spring as the cause of over-voltage. | 25th Jun 1927 | Box 57 \ 2 Scan041 | |
| Burnt platinum-tipped rocker arm on Chassis No.95-MC, attributing the fault to oil vapour. | 30th Oct 1925 | Box 57 \ 2 Scan042 | |
| Issues with the platinum points on chassis GCK-70, suggesting the replacement of the ignition coil and distributor for investigation. | 6th Sep 1926 | Box 57 \ 2 Scan043 | |
| Customer complaint about the short life of platinum points on chassis GCK-70. | 5th Nov 1926 | Box 57 \ 2 Scan044 | |
| Failure of bakelite battery ignition H.T. rotors due to tracking. | 6th Jul 1927 | Box 57 \ 2 Scan045 | |
| Failure of the 20 HP distributor rotor and proposed solutions. | 11th Apr 1929 | Box 57 \ 2 Scan046 | |
| Requesting particulars about a dynamo failure on a 20 HP India chassis. | 27th Oct 1926 | Box 57 \ 2 Scan047 | |
| 20-HP vehicle complaint regarding a defective dynamo and the compilation of a complaint list. | 28th Oct 1926 | Box 57 \ 2 Scan048 | |
| 20 HP dynamo with solder thrown out of the commutator, sent for inspection. | 24th Nov 1926 | Box 57 \ 2 Scan049 | |
| Letter regarding the examination of a 20 HP Dynamo with a faulty negative brush causing solder to run. | 26th Nov 1926 | Box 57 \ 2 Scan050 | |
| Note regarding a 20 HP dynamo from chassis 54S9 returned to the Works for repair. | 28th Nov 1926 | Box 57 \ 2 Scan051 | |
| Instruction sheet requesting the inspection of two dynamos from Cricklewood. | 6th Dec 1926 | Box 57 \ 2 Scan052 | |
| Instruction note regarding a dynamo from a customer's car, requesting a report on its failure. | 8th Dec 1926 | Box 57 \ 2 Scan053 | |
| Report outlining the reasons for failure of a 20 HP Dynamo, number 132. | 6th Dec 1926 | Box 57 \ 2 Scan054 | |
| Request to the Test Department to quieten a dynamo that moans at low and medium speeds. | 13th Dec 1926 | Box 57 \ 2 Scan055 | |
| Faults found in a 20 HP Dynamo No. 896 from chassis GMK.25. | 15th Dec 1926 | Box 57 \ 2 Scan056 | |
| Noisy 20 HP dynamos after repair. | 15th Dec 1926 | Box 57 \ 2 Scan057 | |
| The failure of a 20 HP dynamo from chassis GA.54, detailing issues with the control brush setting and commutator micas. | 15th Dec 1926 | Box 57 \ 2 Scan058 | |
| Noise issue of a Dynamo S.5.H. and proposed solutions for modification and testing. | 16th Dec 1926 | Box 57 \ 2 Scan059 | |
| The dispatch of two machines used on an experimental car. | 16th Dec 1926 | Box 57 \ 2 Scan060 | |
| Fault report on Dynamo No.171 from chassis CMK.40, detailing issues with brush fitting and commutator sparking. | 16th Dec 1926 | Box 57 \ 2 Scan061 | |
| Faults and investigations on several 20 HP dynamos. | 22th Dec 1926 | Box 57 \ 2 Scan062 | |
| Continued memorandum regarding the conditions for inspecting returned dynamos. | 22th Dec 1926 | Box 57 \ 2 Scan063 | |
| The faults found in two 20 HP dynamos, No. 94 and No. 340. | 22th Dec 1926 | Box 57 \ 2 Scan064 | |
| Return and examination of five dynamos. | 14th Dec 1926 | Box 57 \ 2 Scan065 | |
| 20 HP dynamo, number 330, removed from chassis 71A4 for examination. | 30th Dec 1926 | Box 57 \ 2 Scan066 | |
| Possible cause for a dynamo failure on a 20 HP car, attributing it to a weak brush spring or an external circuit fault. | 6th Jan 1927 | Box 57 \ 2 Scan067 | |
| The failure analysis of a 20 HP Dynamo No. 155 from chassis 52-S-7. | 13th Jan 1927 | Box 57 \ 2 Scan068 | |
| To Mr. Clark regarding an adjustment made to a 20 HP dynamo control. | 4th Feb 1927 | Box 57 \ 2 Scan069 | |
| Returned Dynamo from Chassis GSK-76 due to a complaint of low output. | 28th Feb 1927 | Box 57 \ 2 Scan070 | |
| Instructions regarding a noisy Dynamo (20HP) returned from the Test Department. | 22th Mar 1924 | Box 57 \ 2 Scan071 | |
| Repair history of dynamo No.94. | 25th Mar 1927 | Box 57 \ 2 Scan072 | |
| Faulty dynamo returned from chassis 63-H6 for examination. | 25th Mar 1927 | Box 57 \ 2 Scan073 | |
| Recurring fault with a 20 HP Dynamo, No.94, where solder repeatedly runs from the commutator. | 28th Mar 1927 | Box 57 \ 2 Scan074 | |
| Persistent faults found in a 20 HP Dynamo No.94, ex chassis 63-H6, with recommended corrections. | 28th Mar 1927 | Box 57 \ 2 Scan075 | |
| Complaints and repairs for 20 HP and 40/50 HP dynamos returned between January and March 1927. | 30th Mar 1927 | Box 57 \ 2 Scan076 | |
| Instruction sheet regarding the examination of a returned Dynamo NU132 from chassis 72A-O. | 25th Apr 1927 | Box 57 \ 2 Scan077 | |
| Inspection report on a 20 HP Dynamo No. 132 from chassis 72-AO, detailing issues with the control brush setting and commutator micas. | 27th Apr 1927 | Box 57 \ 2 Scan078 | |
| Instruction to examine dynamo No 1749 from chassis C.U.R. 30 and forward a report. | 27th Apr 1927 | Box 57 \ 2 Scan079 | |
| Examination of Dynamo No.1749 from chassis GUK.30, concluding an external fault caused over-voltage running. | 30th Apr 1927 | Box 57 \ 2 Scan080 | |
| Instructions regarding the examination and reporting on a returned 20 HP Dynamo No 1307. | 11th May 1927 | Box 57 \ 2 Scan081 | |
| Examination report on a 20 HP Dynamo, No.1307, detailing issues with stiff brushes, overheating, and excessive lubrication. | 16th May 1927 | Box 57 \ 2 Scan082 | |
| The condition of three 20 HP dynamos received from Cricklewood. | 21th May 1927 | Box 57 \ 2 Scan083 | |
| Faults found in three 20 HP dynamos from various chassis. | 30th May 1927 | Box 57 \ 2 Scan084 | |
| Modification and production of a 20 HP Dynamo L.70. | 30th May 1927 | Box 57 \ 2 Scan085 | |
| Instruction to examine Dynamo No. 371 from Chassis GRK78, noting its previous history with Chassis 69 H. | 9th Jun 1927 | Box 57 \ 2 Scan086 | |
| Instruction sheet detailing issues with a dynamo and cutout from chassis G.S.K. 38, requesting an examination and report. | 23th Jun 1927 | Box 57 \ 2 Scan087 | |
| Examination and test report for Dynamo No. 371 from Chassis GRK. 78, detailing faults found and its return. | 14th Jun 1927 | Box 57 \ 2 Scan088 | |
| Examination report on a faulty dynamo and cutout from a 20 HP chassis GSK.38. | 25th Jun 1927 | Box 57 \ 2 Scan089 | |
| Instruction memo to Mr Clarke regarding a faulty dynamo on chassis C.A.K.5. | 29th Jun 1927 | Box 57 \ 2 Scan090 | |
| The test results of a 20 HP Dynamo No. 775 from chassis GAK.5, which was reported to fail to charge. | 11th Jul 1927 | Box 57 \ 2 Scan091 | |
| Instructions to examine Dynamo No. 235 from Chassis 53 S.4 due to melted solder. | 13th Jul 1927 | Box 57 \ 2 Scan092 | |
| Instruction note regarding a returned dynamo from chassis C.746 where the commutator has been polished. | 13th Jul 1927 | Box 57 \ 2 Scan093 | |
| Inspection report on faulty 20hp dynamos from two different chassis. | 14th Jul 1924 | Box 57 \ 2 Scan094 | |
| Instruction sheet detailing a failure analysis of an electrical component, focusing on brushes, the commutator, and the charging circuit. | 29th Jun 1920 | Box 57 \ 2 Scan095 | |
| Works instruction sheet detailing the faults causing a machine failure. | 29th Jun 1920 | Box 57 \ 2 Scan096 | |
| Two 20 HP dynamos, one from chassis GF.46 and the other 55.S.4. | 1st Jul 1927 | Box 57 \ 2 Scan097 | |
| Inspection report on two faulty 20 HP dynamos, numbers 671 and 235. | 14th Jul 1927 | Box 57 \ 2 Scan098 | |
| Report continuation page detailing faults leading to a machine failure. | 18th Aug 1927 | Box 57 \ 2 Scan099 | |
| Complaints and findings related to 20 HP dynamos from four different chassis. | 18th Aug 1927 | Box 57 \ 2 Scan100 | |
| Instruction sheet requesting a report on solder running from two different vehicle chassis. | 25th Aug 1927 | Box 57 \ 2 Scan101 | |
| Inspection report on a returned 20 HP Dynamo No.489 from chassis 47-G.5. | 30th Aug 1927 | Box 57 \ 2 Scan102 | |
| Instruction memo regarding the inspection of two faulty 20 HP dynamos. | 31th Aug 1927 | Box 57 \ 2 Scan103 | |
| The failure analysis of two 20 HP dynamos from chassis 50 S.1 and GHK.78. | 2nd Sep 1927 | Box 57 \ 2 Scan104 | |
| Continuation page stating that it is unnecessary to receive further machines as the causes of failure are sufficiently known. | 2nd Sep 1927 | Box 57 \ 2 Scan105 | |
| Instruction sheet detailing the investigation of faulty 20 HP 57 Segment Dynamos. | 3rd Nov 1927 | Box 57 \ 2 Scan106 | |
| Fault report detailing issues with solder running on two separate components, one of which also had sticky brushes. | 4th Nov 1927 | Box 57 \ 2 Scan107 | |
| The inspection results for three failed 20 HP dynamos. | 4th Nov 1927 | Box 57 \ 2 Scan108 | |
| Faulty Dynamo received from customer Mrs Titley for chassis GYK-39, requesting an examination and report. | 5th Jan 1928 | Box 57 \ 2 Scan109 | |
| Requesting a reply for a report on a 20 HP Dynamo removed from chassis GYK-39. | 13th Jan 1928 | Box 57 \ 2 Scan110 | |
| Faulty Dynamo received from a customer's chassis. | 20th Jan 1928 | Box 57 \ 2 Scan111 | |
| Modifications for a special winding on a 20 HP chassis dynamo armature. | 27th Feb 1928 | Box 57 \ 2 Scan112 | |
| Experiment to alter characteristics on chassis GCK76 for Mr. J. Bartram. | 24th Feb 1928 | Box 57 \ 2 Scan113 | |
| Confirming alterations to a 20 HP dynamo armature winding. | 24th Feb 1928 | Box 57 \ 2 Scan114 | |
| Typed letter responding to a customer query regarding dynamo charging capacity for chassis GCK-76. | 27th Feb 1928 | Box 57 \ 2 Scan115 | |
| Faulty 20 HP dynamo from chassis GHJ-34 which fails to charge, and querying which account to charge for the repair. | 3rd Mar 1928 | Box 57 \ 2 Scan116 | |
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