| Description | Date | Identifier | |
| Recommending the sale of a pair of Lucas W.T.22 under bonnet horns. | 2nd Jul 1938 | Box 163 \ 4 img047 | |
| Authorizing early leave and wage payment for an employee named C.A. Pignatt. | 20th Jul 1938 | Box 163 \ 4 img048 | |
| Requesting a partition be raised in the Chassis Electrical Laboratory to accommodate charts. | 21th Jul 1938 | Box 163 \ 4 img049 | |
| Outlining the procedure for creating a List of Parts (L.O.P's) for the B.III model. | 14th Sep 1938 | Box 163 \ 4 img050 | |
| Recommendation to sell an obsolete rev-counter instrument from the laboratory for 15 shillings. | 22th Sep 1938 | Box 163 \ 4 img051 | |
| Proposing a new system for filing extracts from periodicals. | 27th Sep 1938 | Box 163 \ 4 img052 | |
| File index listing titles for various technical categories. | 9th Sep 1938 | Box 163 \ 4 img053 | |
| Directive instructing staff to maintain a record of service failures on chassis parts, noting when they occur and at what mileage. | 9th Sep 1938 | Box 163 \ 4 img054 | |
| Announcing that all design and experimental work on Phantom III is to be stopped. | 30th Sep 1938 | Box 163 \ 4 img055 | |
| Requesting subscriptions to the 'Technical Electrical Review' and 'Wireless World' magazines for the library. | 4th Nov 1938 | Box 163 \ 4 img056 | |
| Parts release for production of 50 B.V. motor-cars and the associated chassis pricing. | 24th Nov 1938 | Box 163 \ 4 img057 | |
| Recommendation to sell an obsolete pair of headlamps to an employee for £1.0s.0d. | 7th Dec 1938 | Box 163 \ 4 img058 | |
| Parts availability and specification changes for the next B.V. car model for France. | 22th Dec 1938 | Box 163 \ 4 img059 | |
| Notice regarding deadlines for the submission of weekly bonus cards. | 24th Dec 1938 | Box 163 \ 4 img060 | |
| Recommendation to sell a pair of obsolete and damaged headlamps for 15/-. | 11th Jan 1939 | Box 163 \ 4 img061 | |
| Logistical issues caused by a laboratory relocation and a proposal for a new location. | 31th Jan 1939 | Box 163 \ 4 img062 | |
| The stripping and examination of 'By's Bentley' after 50,000 miles. | 31th Jan 1939 | Box 163 \ 4 img063 | |
| Modifications to a Bentley Outline Specification. | 8th Feb 1939 | Box 163 \ 4 img064 | |
| Recommendation to sell a Motorola radio set, removed from a car, to Mr. F. Dodd for £2. | 18th Feb 1939 | Box 163 \ 4 img065 | |
| Authorizing the transfer of an engineering apprentice between departments. | 13th Mar 1939 | Box 163 \ 4 img066 | |
| The submission deadlines for bonus cards around the 1939 Easter holidays. | 30th Mar 1939 | Box 163 \ 4 img067 | |
| Announcing a meeting to discuss general development progress, with an attached provisional agenda. | 5th Apr 1939 | Box 163 \ 4 img068 | |
| Provisional agenda listing twenty points for engineering discussion. | 5th Apr 1939 | Box 163 \ 4 img069 | |
| Numbered list of action items and queries concerning various car models and components. | 5th Apr 1939 | Box 163 \ 4 img070 | |
| Letter from John Marston Limited requesting a duplicate wiring diagram for a Phantom III engine that was lost. | 5th May 1939 | Box 163 \ 4 img071 | |
| Clarifying the use of order numbers for Test Beds and Test Tackle. | 10th May 1939 | Box 163 \ 4 img072 | |
| Letter from the Experimental Department to John Marston Ltd. regarding a switchboard wiring diagram and exhaust flanges. | 12th May 1939 | Box 163 \ 4 img073 | |
| The early submission of bonus cards for Whitsuntide holiday pay. | 23th May 1939 | Box 163 \ 4 img074 | |
| Requesting a refund of fourpence to J. Jones. | 15th Jun 1939 | Box 163 \ 4 img075 | |
| Disposal of experimental parts and a request to identify any that require saving. | 19th Jun 1939 | Box 163 \ 4 img076 | |
| Various parts from vehicles/engines 35.EX and 28.G.VI. | 20th Jun 1939 | Box 163 \ 4 img077 | |
| The non-renewal of wireless licences for specific vehicles. | 30th Jun 1939 | Box 163 \ 4 img078 | |
| Requesting a change of periodical from 'Electrical Review' to 'Electrical Engineer'. | 30th Jun 1939 | Box 163 \ 4 img079 | |
| Listing the 1939 summer holiday dates for electrical laboratory staff. | 11th Jul 1939 | Box 163 \ 4 img080 | |
| Recommending the sale of an obsolete Philco radio set for £2.0.0d. | 21th Jul 1939 | Box 163 \ 4 img081 | |
| Confirming instructions to issue a covering order for both invoices. | 17th Oct 1939 | Box 163 \ 4 img082 | |
| In-house manufacturing of electrical components for model 31.G.VII. | 4th Dec 1939 | Box 163 \ 4 img083 | |
| Request for two padlocks for cupboards in the electrical lab due to the theft of lamps and plugs. | 12th Dec 1939 | Box 163 \ 4 img084 | |
| Request to obtain 6 heater motors from Messrs. Lucas Ltd. for experimental cars. | 18th Dec 1939 | Box 163 \ 4 img085 | |
| The protocol for visits by outside representatives to the Car Division. | 30th Jan 1940 | Box 163 \ 4 img086 | |
| Internal memorandum regarding compulsory military service for an employee. | 5th Mar 1940 | Box 163 \ 4 img087 | |
| To all testers requesting the return of sheets relating to equipment at the Clan Foundry. | 21th Mar 1940 | Box 163 \ 4 img088 | |
| Compulsory military service, requesting the registration details for two employees. | 9th Apr 1940 | Box 163 \ 4 img089 | |
| Short memo granting leave to M. H. Castledine for an examination. | 7th May 1940 | Box 163 \ 4 img090 | |
| Follow-up memo regarding the overdue arrangement for an expert to manage and report on departmental instruments. | 17th May 1940 | Box 163 \ 4 img091 | |
| Letter to Messrs. ROTAX Ltd. acknowledging receipt of their letter and an E160 Service Manual. | 29th Nov 1940 | Box 163 \ 4 img092 | |
| Proposed design and component layout for the 'Myth' dashboard. | 3rd Dec 1940 | Box 163 \ 4 img093 | |
| Production capabilities of Delco-Remy & Hyatt Ltd. and forwarding their letter for consideration. | 21th Dec 1940 | Box 163 \ 4 img094 | |
| Installation and wiring of an electric motor and heater at the Clan Foundry. | 11th Feb 1941 | Box 163 \ 4 img095 | |
| Enquiry to A.T. Speedometer Co. about a suitable electrical tachometer of the generator-cum-vacuum type. | 7th Feb 1941 | Box 163 \ 4 img096 | |
| Urgent internal order request for B.T.H. magnetos for development purposes. | 13th Feb 1941 | Box 163 \ 4 img097 | |
| Letter to A.T. Speedometer Co. regarding instrument calibration, coupling, and generator rotation. | 26th Feb 1941 | Box 163 \ 4 img098 | |
| The performance of electrical components after 49,499 miles of service on the 10 B.V. vehicle. | 27th Mar 1944 | Box 163 \ 4 img099 | |
| Electrical work and repairs carried out on experimental car 10 B.V. | 27th Mar 1944 | Box 163 \ 4 img100 | |
| Report page detailing electrical faults and repairs on various gauges and lamps. | 21th Mar 1944 | Box 163 \ 4 img101 | |
| Condition report on various engine components including a distributor, coils, harness, and battery. | 21th Mar 1944 | Box 163 \ 4 img102 | |
| Maintenance report on vehicle 10 B.V., detailing work on the starter motor, windscreen wiper, and trafficators. | 2nd Mar 1944 | Box 163 \ 4 img103 | |
| Letter from AC-SPHINX SPARKING PLUG Co. Ltd. regarding samples of Heat Shaped Piston Rings. | 16th Jan 1934 | Box 163 \ 5 img001 | |
| Letter from The AC-Sphinx Sparking Plug Co. Ltd. regarding sample piston rings being ready for dispatch. | 25th Jan 1934 | Box 163 \ 5 img002 | |
| Letter to A.C. Sphinx Sparking Plug Co. Ltd. regarding the despatch and testing of piston rings. | 27th Jan 1934 | Box 163 \ 5 img003 | |
| Request to obtain one sample 10 mm Y4 A.C. Spark plug from the A.C. Sparking Plug CO. | 23th May 1934 | Box 163 \ 5 img004 | |
| Letter from AC-Sphinx Sparking Plug Co. Ltd. regarding an order for 10 mm type Y-4 experimental sparking plugs. | 5th Jun 1934 | Box 163 \ 5 img005 | |
| Request for samples of A.C. detachable aero plugs with insulators in Cintercorund material for experimental testing. | 29th Feb 1936 | Box 163 \ 5 img006 | |
| Letter to AC-Sphinx Sparking Plug Co. Ltd. arranging a meeting. | 5th Mar 1936 | Box 163 \ 5 img007 | |
| Letter from AC-Sphinx Sparking Plug Co. regarding aero engine spark plugs with sinterkorund insulators. | 13th Mar 1936 | Box 163 \ 5 img008 | |
| Letter from AC-Sphinx Sparking Plug Co. Ltd. regarding the development of Aero Plugs with sinterkorund insulators. | 3rd Mar 1936 | Box 163 \ 5 img009 | |
| Letter from AC-Sphinx Sparking Plug Co. regarding the supply of experimental sparking plugs and issues with their American ownership. | 6th Apr 1936 | Box 163 \ 5 img010 | |
| Letter from AC-Sphinx Sparking Plug Co. Ltd. discussing research sharing, business connections, and a society membership application. | 7th Apr 1936 | Box 163 \ 5 img011 | |
| Recommendation to support A.C. Sphinx Sparking Plug Co. Ltd.'s application for S.B.A.C. membership. | 7th Apr 1936 | Box 163 \ 5 img012 | |
| From Sg. to Hs. concerning the SBAC Council application of A.C. Sphinx Sparking Plug Co. Ltd. | 8th Apr 1936 | Box 163 \ 5 img013 | |
| Letter to the AC-Sphinx Sparking Plug Co. regarding plug availability and another request. | 8th Apr 1936 | Box 163 \ 5 img014 | |
| Letter from AC-Sphinx Sparking Plug Co. Ltd. sending sample plugs with sinterkorund insulators for testing. | 9th Apr 1936 | Box 163 \ 5 img015 | |
| Continuation sheet from a letter sent by the Managing Director of The AC-Sphinx Sparking Plug Co., Ltd. | 14th Apr 1936 | Box 163 \ 5 img016 | |
| Letter from AC-Sphinx Sparking Plug Co. Ltd. regarding a 'blowing' issue with experimental detachable spark plugs. | 14th Apr 1936 | Box 163 \ 5 img017 | |
| Letter from AC-Sphinx Sparking Plug Co. regarding issues with sample plugs and sending non-detachable replacements. | 18th Apr 1936 | Box 163 \ 5 img018 | |
| Letter from AC-Sphinx Sparking Plug Co. Ltd. regarding the testing of sinterkorund spark plugs and requesting a sample of a mica plug. | 29th Apr 1936 | Box 163 \ 5 img019 | |
| Letter to the AC-Sphinx Sparking Plug Co. Ltd. regarding the testing of non-detachable plugs. | 30th Apr 1936 | Box 163 \ 5 img020 | |
| Letter from AC-Sphinx Sparking Plug Co. regarding the dispatch of sample Sinterkorund spark plugs for testing. | 9th May 1936 | Box 163 \ 5 img021 | |
| Order for one dozen A.C. sparking plugs, type K.11. | 14th May 1936 | Box 163 \ 5 img022 | |
| Letter to the A.C. Sparking Plug Co. Ltd. regarding the results of tests on their sparking plugs with ceramic insulators. | 22th May 1936 | Box 163 \ 5 img023 | |
| Letter from AC-Sphinx Sparking Plug Co. Ltd. discussing tests on experimental sinterkorund plugs and arranging a meeting. | 25th May 1936 | Box 163 \ 5 img024 | |
| Letter to the Air Ministry detailing the results of tests on A.C. spark plugs with new Sinterkorund insulators. | 29th May 1936 | Box 163 \ 5 img025 | |
| Test report on the performance of spark plugs, types X405 and X406, run in an 'Exe' single-cylinder unit. | 29th May 1936 | Box 163 \ 5 img026 | |
| Letter to AC-Sphinx Sparking Plug Co. Ltd. regarding a report on their aero sparking plugs sent to the Air Ministry. | 29th May 1936 | Box 163 \ 5 img027 | |
| Letter from AC-Sphinx regarding the supply and testing of various types of sinterkorund and K9 spark plugs. | 29th May 1936 | Box 163 \ 5 img028 | |
| Continuation letter from AC-Sphinx Sparking Plug Co. Ltd. regarding sinterkorund plugs and instrument samples for a Bentley. | 4th Jun 1936 | Box 163 \ 5 img029 | |
| Letter from AC-Sphinx Sparking Plug Co. regarding screened plugs and potential patent infringement. | 4th Jun 1936 | Box 163 \ 5 img030 | |
| Letter declining to provide particulars for a British patent related to screening plugs. | 5th Jun 1936 | Box 163 \ 5 img031 | |
| Letter from AC-Sphinx Sparking Plug Co. Ltd. discussing the design and dimensions of a proposed 14mm shielded spark plug. | 5th Jun 1936 | Box 163 \ 5 img032 | |
| Letter to AC-Sphinx Sparking Plugs Ltd. regarding a design conflict with a hexagon dimension. | 6th Jun 1936 | Box 163 \ 5 img033 | |
| Letter to AC-Sphinx Sparking Plug Co. Ltd. regarding blueprints for standard instruments. | 11th Jun 1936 | Box 163 \ 5 img034 | |
| Letter from AC-Sphinx Sparking Plug Co. Ltd. regarding manufacturing difficulties with Sinterkorund plugs for a Bentley. | 12th Jun 1936 | Box 163 \ 5 img035 | |
| Letter from AC-Sphinx Sparking Plug Co. Ltd. concerning the hexagon size on experimental sinterkorund plugs. | 12th Jun 1936 | Box 163 \ 5 img036 | |
| Letter to AC-Sphinx Sparking Plug Co. Ltd. regarding the impossibility of reducing a barrel's length. | 15th Jun 1936 | Box 163 \ 5 img037 | |
| Letter from AC-Sphinx Sparking Plug Co. Ltd. enclosing blueprints for aircraft sinterkorund plugs for testing. | 15th Jun 1936 | Box 163 \ 5 img038 | |
| Blueprint for an experimental 14mm plug assembly. | 15th Jun 1936 | Box 163 \ 5 img039 | |
| Drawing of an experimental 14mm plug assembly. | 15th Jun 1936 | Box 163 \ 5 img040 | |
| Letter to AC-Sphinx Sparking Plug Co. Ltd. confirming the dimensional correctness of submitted drawings. | 16th Jun 1936 | Box 163 \ 5 img041 | |
| Letter to A.C. Sphinx Sparking Plug Co. Ltd. about the status of aero sparking plugs and proposing motor car plugs for Bentley chassis. | 6th Jul 1936 | Box 163 \ 5 img042 | |
| Follow-up letter regarding tests on A.C. sparking plugs and their length. | 6th Jul 1936 | Box 163 \ 5 img043 | |
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