| Description | Date | Identifier | |
| Proposing a visit to West Wittering with essential pieces of a Curtis aero engine. | 17th Aug 1926 | Box 33 \ 2 Scan096 | |
| Short typed memo confirming the date for a visit with Mr. Royce. | 12th Aug 1926 | Box 33 \ 2 Scan097 | |
| Proposing a visit to discuss high-speed vibration tests on a 20 HP engine. | 7th Sep 1926 | Box 33 \ 2 Scan098 | |
| Confirming a visit to West Wittering and detailing the vehicles and parts to be brought. | 19th Oct 1926 | Box 33 \ 2 Scan099 | |
| Short memo regarding a proposed visit to West Wittering. | 21th Oct 1926 | Box 33 \ 2 Scan100 | |
| Arranging a visit to discuss the sequence starter and battery ignition points. | 3rd May 1927 | Box 33 \ 2 Scan101 | |
| Proposing a visit to West Wittering to deliver parts of F.10 which have completed type testing. | 5th May 1927 | Box 33 \ 2 Scan102 | |
| Final arrangements for the Karachi flight, including a full load take-off test, and postponing a visit. | 7th May 1927 | Box 33 \ 2 Scan103 | |
| Short typed memo from EFC to R. regarding a change of travel plans for a visit. | 9th May 1927 | Box 33 \ 2 Scan104 | |
| Short memorandum confirming arrangements for a visit to West Wittering. | 13th May 1927 | Box 33 \ 2 Scan105 | |
| Short memo confirming a visit for Tuesday the 17th. | 13th May 1927 | Box 33 \ 2 Scan106 | |
| Confirmation of a telegram from Royce to Rowledge and Hives regarding a meeting to discuss chassis problems. | 14th May 1927 | Box 33 \ 2 Scan107 | |
| From Hs. to R. proposing a visit to WN. on Wednesday the 6th. | 1st Jul 1927 | Box 33 \ 2 Scan108 | |
| From R. to RG. arranging a visit to WW. to discuss final engine design points. | 15th Jul 1928 | Box 33 \ 2 Scan109 | |
| Arranging a visit for the following Thursday. | 22th Aug 1927 | Box 33 \ 2 Scan110 | |
| Proposing a visit to discuss oil cooling of the F engine. | 21th Sep 1927 | Box 33 \ 2 Scan111 | |
| Brief typed memorandum confirming arrangements for a visit to WW. | 21th Oct 1927 | Box 33 \ 2 Scan112 | |
| Short internal memo arranging a visit to 'WW'. | 2nd Dec 1927 | Box 33 \ 2 Scan113 | |
| From 'R.' arranging a visit with W.W. for the following week, suggesting Tuesday or Wednesday. | 12th Dec 1927 | Box 33 \ 2 Scan114 | |
| Arranging a visit to West Wittering and the transport of an 'H' engine. | 12th Dec 1927 | Box 33 \ 2 Scan115 | |
| Short memo confirming a proposed visit to 'WW' by 'RG' and 'Hs'. | 12th May 1928 | Box 33 \ 2 Scan116 | |
| Arranging the inspection of H. engine parts at West Wittering and coordinating travel with Major Bulman. | 1st Jun 1928 | Box 33 \ 2 Scan117 | |
| Relaying a telegram about an agreement to patent a steam separator and arrange a visit. | 6th Jun 1928 | Box 33 \ 2 Scan118 | |
| Confirming a contract for 80 engines with the Air Ministry and arranging a follow-up meeting. | 8th Jun 1928 | Box 33 \ 2 Scan119 | |
| Confirming the delivery schedule for a 20 HP car. | 25th Jul 1928 | Box 33 \ 2 Scan120 | |
| Confirmation of a wire message arranging a meeting. | 13th Aug 1928 | Box 33 \ 2 Scan121 | |
| Short typed memo confirming an arranged visit in response to a wire. | 13th Aug 1928 | Box 33 \ 2 Scan122 | |
| Urgent meeting and for the attached correspondence to be passed on. | 24th Sep 1928 | Box 33 \ 2 Scan123 | |
| Confirming a visit to WW for Mr. Royce, also requesting the presence of HS. | 23th Oct 1928 | Box 33 \ 2 Scan124 | |
| Typed memo proposing a visit for the following Wednesday. | 22th Sep 1928 | Box 33 \ 2 Scan125 | |
| Telegram from Royce to Hives arranging to meet. | 27th Nov 1928 | Box 33 \ 2 Scan126 | |
| Telegram from Elliott arranging a visit to West Wittering for after Thursday May second. | 30th Apr 1929 | Box 33 \ 2 Scan127 | |
| Confirmation of a telegram sent to arrange an upcoming visit. | 1st May 1929 | Box 33 \ 2 Scan128 | |
| Brief typed memo with handwritten amendments arranging a visit. | 20th Jun 1929 | Box 33 \ 2 Scan129 | |
| Short memo proposing a visit for the following Tuesday. | 15th Oct 1929 | Box 33 \ 2 Scan130 | |
| Confirming a visit is rescheduled from Tuesday to Wednesday the 23rd. | 19th Oct 1929 | Box 33 \ 2 Scan131 | |
| Discussions from a visit to West Wittering regarding gas starter distributors and crankcase strength for F and H type engines. | 5th Nov 1929 | Box 33 \ 2 Scan132 | |
| Engine distribution, gear rattles, airscrew vibration, and combustion space design. | 7th Nov 1929 | Box 33 \ 2 Scan133 | |
| Confirmation of expected arrival with a second L.H. P.2. chassis. | 9th Jul 1930 | Box 33 \ 2 Scan134 | |
| Proposing a visit to fit an anti-spilling scheme and shutters to a left-hand car. | 23th Sep 1930 | Box 33 \ 2 Scan135 | |
| Outlining a planned visit to W.W. with a 25 HP car for a 10,000-mile test and a Phantom. | 24th Oct 1930 | Box 33 \ 2 Scan136 | |
| Proposing a meeting with ACL to discuss tests on cylinders. | 22th Nov 1930 | Box 33 \ 2 Scan137 | |
| Planned visit to West Wittering to discuss engine specifications and shock absorber designs for future models. | 17th Oct 1932 | Box 33 \ 2 Scan138 | |
| Future design improvements, including hydraulic dampers, independently sprung wheels, and a silent second gear scheme. | 17th Oct 1932 | Box 33 \ 2 Scan139 | |
| Typed memo regarding a visit to West Wittering, shock absorbers, and a questionnaire about the 'Spectre'. | 18th Oct 1932 | Box 33 \ 2 Scan140 | |
| Visit to 'R' to discuss developments in steering, suspension, gearboxes, and dampers. | 9th Dec 1932 | Box 33 \ 2 Scan141 | |
| Follow-up note regarding a visit to 'R.' and breaking the ice about Marles Weller Steering. | 12th Dec 1932 | Box 33 \ 2 Scan142 | |
| Coordinating visits and meetings in Derby, Brighton, and Olympia. | 19th Oct 1932 | Box 33 \ 2 Scan143 | |
| Ignition testing regarding the length of spark gaps. | 25th Jan 1909 | Box 33 \ 3 Scan001 | |
| Alterations to the size and specifications of spark gap gauges. | 23th Dec 1910 | Box 33 \ 3 Scan002 | |
| Test report for an Anchor Sparking Plug. | 2nd Nov 1911 | Box 33 \ 3 Scan003 | |
| Test results of Renault spark plugs compared to Pognon plugs. | 30th Jun 1909 | Box 33 \ 3 Scan004 | |
| Specifications for various feeler gauges. | 22th May 1913 | Box 33 \ 3 Scan005 | |
| Oxidising trouble with ignition plugs, its causes, and potential solutions. | 8th Jul 1916 | Box 33 \ 3 Scan006 | |
| Potential petrol distribution issues in certain cylinders and the effect of carburettor mixture settings. | 8th Jul 1916 | Box 33 \ 3 Scan007 | |
| The test of a special sparking plug in Eagle and Falcon aero engines. | 26th Jun 1918 | Box 33 \ 3 Scan008 | |
| Departmental memo about sending 'EOLE' Co. sparking plugs to Derby for testing on aviation engines. | 7th May 1919 | Box 33 \ 3 Scan009 | |
| Departmental memo requesting a report on sparking plugs tested on aero and car engines. | 22th Jul 1919 | Box 33 \ 3 Scan010 | |
| The low stock of motorcar sparking plugs and a request for advice on which type to order. | 30th Jan 1918 | Box 33 \ 3 Scan011 | |
| Letter from Gregg Brothers offering to sell 1,000 French-made 24 m/m thread plugs suitable for earlier cars. | 1st Feb 1919 | Box 33 \ 3 Scan012 | |
| Letter from Raynaud & Bourceret regarding the supply of 18 spark plugs for testing. | 17th May 1919 | Box 33 \ 3 Scan013 | |
| Departmental memo requesting a trial of sparking plugs from Messrs. Raynaud & Bouveret. | 7th May 1919 | Box 33 \ 3 Scan014 | |
| Stating that no tests have been carried out on plugs submitted by Alfred Watkins or Mr. Glen. | 2nd Aug 1919 | Box 33 \ 3 Scan015 | |
| Departmental memo requesting a test report on 'RèV' sparking plugs. | 26th Aug 1919 | Box 33 \ 3 Scan016 | |
| Letter from The Igna Engineering Company Limited regarding their mica sparking plugs. | 8th Oct 1919 | Box 33 \ 3 Scan017 | |
| Letter from The Igna Engineering Co. Ltd. describing their patent cleaner and ruby mica sparking plugs. | 11th Oct 1919 | Box 33 \ 3 Scan018 | |
| Confirmation of a telegram from Royce regarding a slight engine misfire and potential fixes. | 24th Oct 1919 | Box 33 \ 3 Scan019 | |
| Sales letter from The A.J. Alsdorf Corporation regarding their TUNGSTEN Spark Plugs. | 27th Oct 1919 | Box 33 \ 3 Scan020 | |
| Business letter detailing discounts and an introductory offer for TUNGSTEN Spark Plugs. | 24th Nov 1919 | Box 33 \ 3 Scan021 | |
| Three-panel advertising leaflet in Spanish for Tungsten Spark Plugs. | 24th Nov 1919 | Box 33 \ 3 Scan022 | |
| Advertising leaflet in Spanish for Tungsten spark plugs, featuring a detailed cutaway diagram. | 24th Nov 1919 | Box 33 \ 3 Scan023 | |
| Exploded view and component breakdown of a Tungsten spark plug in Spanish. | 24th Nov 1919 | Box 33 \ 3 Scan025 | |
| Confirmation of a telegram detailing troubleshooting steps to cure engine misfires. | 27th Oct 1919 | Box 33 \ 3 Scan026 | |
| Request to find a more satisfactory plug and to trial K.L.G. 7 and K.L.G. F.52 types. | 30th Oct 1919 | Box 33 \ 3 Scan027 | |
| Significant issues and anxiety over the inspection, testing, and poor performance of various types of spark plugs. | 31th Oct 1919 | Box 33 \ 3 Scan028 | |
| Test report comparing spark plug performance at different magneto speeds. | 1st Nov 1919 | Box 33 \ 3 Scan029 | |
| Modifications to the battery ignition system and their effects on engine performance. | 1st Nov 1919 | Box 33 \ 3 Scan030 | |
| Remedies for sooty spark plugs, including petrol quality and coil insulation. | 11th Nov 1919 | Box 33 \ 3 Scan031 | |
| Telegram confirmation regarding the failure of mica spark plugs compared to porcelain ones. | 4th Nov 1919 | Box 33 \ 3 Scan032 | |
| Road test of chassis 1.EX focusing on battery ignition performance after alterations. | 4th Nov 1919 | Box 33 \ 3 Scan033 | |
| Use of tungsten as a replacement for platinum in high and low tension contacts and for ignition plugs. | 11th Nov 1919 | Box 33 \ 3 Scan034 | |
| Engine starting procedures, the use of a primer, and related issues such as sooting. | 10th Nov 1919 | Box 33 \ 3 Scan035 | |
| Potential cause of sooting spark plugs related to new self-starter procedures. | 6th Nov 1919 | Box 33 \ 3 Scan036 | |
| Mr. Royce's emphasis on using the correct plugs for post-war cars and arranging for their supply and fitting. | 11th Nov 1919 | Box 33 \ 3 Scan037 | |
| Departmental memo chasing a report on 30 'Bougies Eole' sparking plugs sent for testing on aeroplane engines. | 10th Dec 1919 | Box 33 \ 3 Scan038 | |
| Investigating an ignition failure, concluding wider spark plug gaps are advantageous for battery ignition systems. | 30th Dec 1919 | Box 33 \ 3 Scan039 | |
| Experiments to improve engine ignition by adjusting spark gaps and coil windings. | 30th Dec 1919 | Box 33 \ 3 Scan040 | |
| 10,000-mile test on 'Forward' spark plugs by the Forward Sparking Plug Company. | 13th Jan 1920 | Box 33 \ 3 Scan041 | |
| Order for one dozen 'Forward' type 'E' spark plugs. | 14th Jan 1920 | Box 33 \ 3 Scan042 | |
| Brief report comparing the performance of Lodge C.9 plugs against K.L.G. plugs. | 19th Jan 1920 | Box 33 \ 3 Scan043 | |
| The receipt of parts for an experiment and two orders, including Marble Resistance Seatings, Ferodo material, and Forward Sparking Plugs. | 21th Jan 1920 | Box 33 \ 3 Scan044 | |
| The unsuitability of 'Forward' sparking plugs due to construction and measurement issues. | 21th Jan 1920 | Box 33 \ 3 Scan045 | |
| Inquiring about the experience with 'Forward' plugs for potential further experimentation. | 22th Jan 1920 | Box 33 \ 3 Scan046 | |
| The unsuitability of 'Forward' sparking plugs due to issues with measuring the spark gap and their construction. | 21th Jan 1920 | Box 33 \ 3 Scan047 | |
| Cover note for an attached document concerning 'Forward' plugs. | 6th Aug 1920 | Box 33 \ 3 Scan048 | |
| List of electrical parts sent from the United States with status updates on their receipt and customs clearance. | 30th Jan 1920 | Box 33 \ 3 Scan049 | |
| Sales letter from Ripaults Manufacturing Engineers promoting their Oleo Plugs and offering samples for testing. | 19th Feb 1920 | Box 33 \ 3 Scan050 | |
| Sample spark plug received from the Gilardoni Sparking Plug Company for testing. | 20th Feb 1920 | Box 33 \ 3 Scan051 | |
| Letter from The British Aris Sparking Plug Co. Ltd. about their range of spark plugs and connectors. | 8th Mar 1920 | Box 33 \ 3 Scan052 | |
| Advertisement for a 'High Tension Connector' from The British Aris Sparking Plug Company, Ltd. | 8th Mar 1920 | Box 33 \ 3 Scan053 | |
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