| Description | Date | Identifier | |
| Visit to the High Voltage Research Laboratories of Metropolitan Vickers to discuss ignition investigation. | 5th Jul 1939 | Box 163 \ 7 img331 | |
| Visit to a research laboratory to discuss high-voltage investigations and equipment. | 5th Jul 1939 | Box 163 \ 7 img332 | |
| Supply of an electric motor and various ignition components, noting that a rig needs to be manufactured. | 5th Jul 1939 | Box 163 \ 7 img333 | |
| Letter from Metropolitan-Vickers confirming preliminary investigation work on ignition problems. | 7th Jul 1939 | Box 163 \ 7 img334 | |
| The ignition of weak fuel mixtures and planned tests on spark plugs and ignition systems. | 23th Feb 1940 | Box 163 \ 7 img335 | |
| Instructions for testing procedures related to spark plugs, voltage, and carburation settings. | 30th Jun 1939 | Box 163 \ 7 img336 | |
| Visit to Vauxhall Motors Ltd. in Luton to check on experimental work on carburation and fuel economy. | 30th Jun 1939 | Box 163 \ 7 img337 | |
| Ignition system development, including spark plug findings, vacuum advance, and petrol consumption. | 30th Jun 1939 | Box 163 \ 7 img338 | |
| Conclusion on factors for improving fuel economy, focusing on the vacuum control unit and ignition system. | 30th Jun 1939 | Box 163 \ 7 img339 | |
| Diagnosing engine misfires by considering ignition coils and distributors as potential causes. | 30th Jun 1939 | Box 163 \ 7 img340 | |
| Fitting of a governor and a Vertex Magneto to marine engines to prevent over-revving. | 5th Apr 1940 | Box 163 \ 7 img341 | |
| Letter from Metropolitan-Vickers Electrical Co. chasing up equipment for investigational work on ignition problems. | 18th Jun 1940 | Box 163 \ 7 img342 | |
| Letter to Metropolitan Vickers Electrical Co. Ltd. suspending ignition investigation work due to the war. | 25th Jun 1940 | Box 163 \ 7 img343 | |
| Letter from Metropolitan-Vickers suspending investigational work on ignition problems due to abnormal circumstances. | 29th Jun 1940 | Box 163 \ 7 img344 | |
| Installation of a Scintilla Magneto on a B.80 Marine engine, fearing bracket failure from vibration and recommending an additional stay. | 10th May 1940 | Box 163 \ 7 img345 | |
| Internal request to obtain a vertex magneto type NV 8, which was later cancelled due to the war. | 10th Apr 1940 | Box 163 \ 7 img346 | |
| Letter detailing the investigation into a faulty Boyce Electric Clock No. 696, which intermittently stops and can be restarted by shaking. | 8th Jan 1931 | Box 164 \ 1 img001 | |
| Page 2 of a letter to Boyce Motor Accessories Ltd regarding a faulty clock being returned to the manufacturer. | 8th Jan 1931 | Box 164 \ 1 img002 | |
| Instructions for the despatch of a Boyce Electric Clock No. 696 for inspection. | 1st Jan 1931 | Box 164 \ 1 img003 | |
| Letter from Boyce Motor Accessories Ltd. regarding a faulty clock, number 696. | 12th Jan 1931 | Box 164 \ 1 img004 | |
| Letter from Gent & Co. Ltd. discussing technical modifications to car electric clock model 301. | 20th Jan 1931 | Box 164 \ 1 img005 | |
| Diagram illustrating the operation of a contact breaker mechanism in two states. | 20th Jan 1931 | Box 164 \ 1 img006 | |
| Letter detailing the operating principles of a clock's contact and winding mechanism, referencing the 'PUL-SYN-ETIC' system. | 20th Jan 1931 | Box 164 \ 1 img007 | |
| Letter from Gent & Co. Ltd. concerning a delay with the modification of a clock. | 20th Jan 1931 | Box 164 \ 1 img008 | |
| Letter from English Clock & Watch Manufacturers Ltd. regarding the return of a tested 'Empire' Electric Car clock. | 21th Jan 1931 | Box 164 \ 1 img009 | |
| Debit note from English Clock & Watch Manufacturers Ltd. for a Boyce Empire Electric Car Clock. | 21th Jan 1931 | Box 164 \ 1 img010 | |
| Letter to The English Clock & Watch Manufacturers Ltd. regarding the testing and fitting of Boyce Electric Clock No. 696. | 22th Jan 1931 | Box 164 \ 1 img011 | |
| Letter from Boyce Motor Accessories Ltd confirming the return of Clock No. 696. | 23th Jan 1931 | Box 164 \ 1 img012 | |
| The status of Boyce Electric Clock no. 696 following a repair by the makers. | 29th Jan 1931 | Box 164 \ 1 img013 | |
| Letter from Gent & Co. Ltd. regarding the development and testing of a Motor Car Clock following an enquiry from Mr. Royce. | 27th Feb 1931 | Box 164 \ 1 img014 | |
| Typed letter to Messrs. Gent & Co. Ltd of Leicester regarding a lost letter and expecting the return of a clock. | 9th Mar 1931 | Box 164 \ 1 img015 | |
| Test report on the performance of a Seth Thomas clock after three months of use in a car. | 10th Mar 1931 | Box 164 \ 1 img016 | |
| Letter from Gent & Co. Ltd. regarding a motor car clock they have had under observation. | 10th Mar 1931 | Box 164 \ 1 img017 | |
| The status of the new standard instrument patch for fitting experimental car electric clocks. | 2nd Mar 1931 | Box 164 \ 1 img018 | |
| Fitting of electric clocks to experimental cars. | 19th Mar 1931 | Box 164 \ 1 img019 | |
| Examination and faults of a Boyce Electric Clock. | 27th Mar 1931 | Box 164 \ 1 img020 | |
| Faulty Boyce Electric Clock, detailing its performance and how it broke. | 30th Mar 1931 | Box 164 \ 1 img021 | |
| Letter of complaint regarding the performance and failure of a Boyce Electric Clock No. 601. | 31th Mar 1931 | Box 164 \ 1 img022 | |
| Letter detailing the results of an examination of a faulty clock, being the second page of the correspondence. | 31th Mar 1931 | Box 164 \ 1 img023 | |
| Letter to Boyce Motor Accessories Ltd. regarding the testing of clocks. | 31th Mar 1931 | Box 164 \ 1 img024 | |
| Arranging for a Boyce Electric Clock to be despatched for repair. | 1st Apr 1931 | Box 164 \ 1 img025 | |
| Letter from Boyce Motor Accessories Ltd regarding the failure of an electric clock, model 601, due to a broken hand setting knob. | 2nd Apr 1931 | Box 164 \ 1 img026 | |
| Letter from a supplier regarding a faulty and potentially tampered-with electric clock. | 27th Apr 1931 | Box 164 \ 1 img027 | |
| Letter from Boyce Motor Accessories Ltd. regarding the inspection and return of an instrument. | 27th Apr 1931 | Box 164 \ 1 img028 | |
| Letter from Gent & Co. Ltd. regarding improvements and testing of a Motor Car Clock, model no. 301. | 1st May 1931 | Box 164 \ 1 img029 | |
| Technical notes on the Car Electric Clock No. 301. | 1st May 1931 | Box 164 \ 1 img030 | |
| The current taken by a clock at different voltages. | 1st May 1931 | Box 164 \ 1 img031 | |
| Letter to Boyce Motor Accessories Ltd. detailing the history and testing of electric clock No. 601. | 5th May 1931 | Box 164 \ 1 img032 | |
| Letter to Boyce Motor Accessories Ltd. regarding a fault with a clock. | 7th May 1931 | Box 164 \ 1 img033 | |
| Letter to Messrs. Gent & Co. Ltd. concerning modifications and testing of a Car Electric Clock, model No. 301. | 7th May 1931 | Box 164 \ 1 img034 | |
| Letter from Boyce Motor Accessories Ltd regarding the re-testing of an instrument, possibly a clock. | 9th May 1931 | Box 164 \ 1 img035 | |
| The failure and testing of a Boyce Electric Clock No. 601. | 1st May 1931 | Box 164 \ 1 img036 | |
| Requesting the fitting of two Boyce electric clocks to experimental cars 18-GIV and 22-EX. | 1st May 1931 | Box 164 \ 1 img037 | |
| Return of Boyce Electric Clock No.601 for testing. | 12th May 1931 | Box 164 \ 1 img038 | |
| Request to fit a Boyce Electric Clock to car 25-EX for a 10,000-mile test. | 7th Jun 1931 | Box 164 \ 1 img039 | |
| Returning a Gent electric clock to the makers as it is unsuitable for testing on the chassis. | 2nd Aug 1931 | Box 164 \ 1 img040 | |
| Complaints with the standard Watford instrument clock and the testing of alternative electric clocks. | 28th Sep 1931 | Box 164 \ 1 img041 | |
| Recommendation to produce a sample batch of 24 Boyce clocks for evaluation and cost comparison. | 28th Sep 1931 | Box 164 \ 1 img042 | |
| Performance and potential wider use of a Boyce electric clock fitted to car 58-GN. | 29th Sep 1931 | Box 164 \ 1 img043 | |
| Requesting the fitting of a Boyce electric clock to the instrument board of vehicle 27-EX. | 29th Sep 1931 | Box 164 \ 1 img044 | |
| Inquiring about the Boyce electric clock for the instrument board of the 20/25 model. | 14th Oct 1931 | Box 164 \ 1 img045 | |
| Ordering and fitting Boyce electric clocks for Phantom II and 20/25 HP chassis. | 15th Oct 1931 | Box 164 \ 1 img046 | |
| Fitting of a Boyce Electric Clock to the instrument patch on car 25-EX. | 23th Oct 1931 | Box 164 \ 1 img047 | |
| Acquiring a sample of an electrical self-winding Boyce clock, possibly made by Ferranti's. | 27th Oct 1931 | Box 164 \ 1 img048 | |
| Agreeing to an order for instrument board clocks for the Phantom II and 20/25 models, while considering future proposals. | 28th Oct 1931 | Box 164 \ 1 img049 | |
| Inquiring about the availability of electric instrument board clocks from Ferranti and Gent Co. | 30th Oct 1931 | Box 164 \ 1 img050 | |
| Sourcing of British-made electric clocks for an instrument board. | 30th Oct 1931 | Box 164 \ 1 img051 | |
| Letter to S. Smith & Sons, Ltd. requesting a Smith electric clock for examination and testing. | 30th Oct 1931 | Box 164 \ 1 img052 | |
| Letter from S. Smith & Sons (Motor Accessories) Ltd confirming a sample of an Electric Clock will be despatched. | 31th Oct 1931 | Box 164 \ 1 img053 | |
| Testing of a sample electric instrument board clock from Gent & Co. | 2nd Nov 1931 | Box 164 \ 1 img054 | |
| Letter to Gent Co. Ltd. concerning a sample electric instrument clock that lacks external hand adjustment. | 3rd Nov 1931 | Box 164 \ 1 img055 | |
| Letter regarding the modification of an electric instrument board clock to allow for external time adjustment. | 4th Nov 1931 | Box 164 \ 1 img056 | |
| Following up on a conversation about sourcing electric instrument board clocks from the company Ferrantis. | 4th Nov 1931 | Box 164 \ 1 img057 | |
| Requesting the despatch of a Gent electric instrument board clock to the manufacturer to have a knurled knob fitted. | 3rd Nov 1931 | Box 164 \ 1 img058 | |
| Enquiries made to Ferranti about the availability of electric instrument board clocks. | 7th Nov 1931 | Box 164 \ 1 img059 | |
| Letter to Cent & Co. Ltd. regarding the modification of an electric instrument board clock. | 7th Nov 1931 | Box 164 \ 1 img060 | |
| Letter regarding modifications to an electric instrument board clock, including fitting a knurled knob and addressing holes in the case. | 9th Nov 1931 | Box 164 \ 1 img061 | |
| Letter discussing the design, performance, and issues with specimen and previously supplied dashboard clocks. | 14th Nov 1931 | Box 164 \ 1 img062 | |
| Letter from F. H. Royce detailing an idea for a clock rewinding principle based on large turret clocks. | 17th Nov 1931 | Box 164 \ 1 img063 | |
| Letter regarding modifications made to an electrically operated car clock. | 17th Nov 1931 | Box 164 \ 1 img064 | |
| Request to fit a Gent electric instrument board clock to chassis 19-EX. | 9th Nov 1931 | Box 164 \ 1 img065 | |
| Standardisation report for a Boyce electric instrument board clock. | 15th Oct 1931 | Box 164 \ 1 img066 | |
| Form for the standardisation of chassis parts, detailing changes, costs, and approvals. | 16th Oct 1931 | Box 164 \ 1 img067 | |
| Selection of ammeters and self-winding clocks for cars. | 28th Nov 1931 | Box 164 \ 1 img068 | |
| Letter to S. Smith & Sons, Ltd. regarding the testing of an electric clock and arranging a meeting. | 1st Dec 1931 | Box 164 \ 1 img069 | |
| Return of a Smith electric clock to the Stores for despatch after an approval test. | 1st Dec 1931 | Box 164 \ 1 img070 | |
| Letter from S. Smith & Sons regarding a proposed visit to discuss electric clocks and a sample instrument panel. | 3rd Dec 1931 | Box 164 \ 1 img071 | |
| Letter to S. Smith & Sons, Ltd. regarding arrangements for a visit from Mr. Watson. | 7th Dec 1931 | Box 164 \ 1 img072 | |
| Letter from S. Smith & Sons arranging a visit for Mr. Watson. | 9th Dec 1931 | Box 164 \ 1 img073 | |
| Returned sample Smith electric clock and a disputed invoice. | 8th Dec 1931 | Box 164 \ 1 img074 | |
| Letter to Boyce Motor Accessories Ltd. detailing failures and suggesting improvements for their electric clock. | 31th Dec 1931 | Box 164 \ 1 img075 | |
| Despatch of Boyce Electric Clock No. 662 for repair. | 31th Dec 1931 | Box 164 \ 1 img076 | |
| Letter from Boyce Motor Accessories Ltd regarding the repair of clock number 662. | 2nd Jan 1932 | Box 164 \ 1 img077 | |
| Request to fit a Boyce Electric Clock No.696 to chassis 19-EX for testing. | 1st Jan 1932 | Box 164 \ 1 img078 | |
| Letter from Boyce Motor Accessories Ltd regarding issues found with the Empire Electric Clock No. 662. | 20th Jan 1932 | Box 164 \ 1 img079 | |
| Letter from Boyce Motor Accessories Ltd. regarding the repair of a clock, suggestions for replacement fuses, and the return of an order receipt. | 20th Jan 1932 | Box 164 \ 1 img080 | |
| Faulty Boyce electric clock being sent to the makers for repair. | 3rd Mar 1932 | Box 164 \ 1 img081 | |
| Requesting the return and overhaul of a Boyce Empire electric clock, No. 696, for chassis 20-EX. | 20th May 1932 | Box 164 \ 1 img082 | |
| Return of a sample Gent electric clock and a request for the return of parts from a Watford clock. | 20th May 1932 | Box 164 \ 1 img083 | |
| Handover of a sample Watford electric clock after testing. | 31th May 1932 | Box 164 \ 1 img084 | |
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