| Description | Date | Identifier | |
| Successful bench trial and construction of a new auto switch unit for reducing charging current. | 11th Nov 1927 | Box 35 \ 3 scan 101 | |
| Continued discussion on eliminating vibrator regulator action and considerations for connecting cutout and auto switch shunt coils. | 11th Nov 1927 | Box 35 \ 3 scan 102 | |
| Continued report on wiring configurations for cutout shunts and auto switches in an automotive electrical system. | 11th Nov 1927 | Box 35 \ 3 scan 103 | |
| The electrical behavior and vibration issues of an auto-switch and cutout unit. | 11th Nov 1927 | Box 35 \ 3 scan 104 | |
| Page detailing the operation of the auto switch and cutout under varying load and speed conditions. | 11th Nov 1927 | Box 35 \ 3 scan 105 | |
| The advantages and disadvantages of using high resistance in the auto switch and cutout circuit. | 11th Nov 1927 | Box 35 \ 3 scan 106 | |
| Comparison of a proposed auto-switch arrangement with the Midgley type, focusing on the lighting circuit and patent avoidance. | 11th Nov 1927 | Box 35 \ 3 scan 107 | |
| Considerations for electrical resistance and components to balance system voltage and contact sparking. | 17th Dec 1919 | Box 35 \ 3 scan 108 | |
| Letter from Morris, Russell & Co., Ltd. concerning British-made 'Champion' spark plugs. | 17th Dec 1919 | Box 35 \ 3 scan 109 | |
| Catalogue page detailing various Champion Spark Plugs and their applications for different vehicles. | 24th Nov 1919 | Box 35 \ 3 scan 110 | |
| Product catalogue page for various types of Champion Spark Plugs. | 17th Mar 1920 | Box 35 \ 3 scan 111 | |
| American chassis parts, specifically evaluating Herz and Champion spark plugs. | 17th Mar 1920 | Box 35 \ 3 scan 112 | |
| From Mr. Olley to Mr. F.H. Royce regarding various types of spark plugs and the testing of a Champion Toledo plug. | 22th May 1920 | Box 35 \ 3 scan 113 | |
| Report comparing different types of American spark plugs, including A.C. Champion and Champion Toledo. | 22th May 1920 | Box 35 \ 3 scan 114 | |
| Report discussing future possibilities and developments in spark plug design and materials. | 23th Aug 1920 | Box 35 \ 3 scan 115 | |
| Letter from Rolls-Royce of America regarding the testing and use of Champion Spark Plugs. | 23th Aug 1920 | Box 35 \ 3 scan 116 | |
| Spark plugs fitted to car 49-GB. | 28th Sep 1920 | Box 35 \ 3 scan 117 | |
| Extract of a memorandum discussing the performance and use of American Champion ignition plugs. | 23th Aug 1920 | Box 35 \ 3 scan 118 | |
| Request for a stock of 'Champion' plugs for comparison with 'Lodge 9' plugs. | 18th Oct 1920 | Box 35 \ 3 scan 119 | |
| One dozen Champion sparking plugs of the porcelain detachable type for the 1.EX Car. | 23th Oct 1920 | Box 35 \ 3 scan 120 | |
| The dispatch of Champion 3-point spark plugs for testing purposes. | 8th Nov 1920 | Box 35 \ 3 scan 121 | |
| Satisfactory performance of K.L.G. plugs in endurance tests, referencing a report from S. Smith & Sons. | 1st Oct 1923 | Box 35 \ 3 scan 122 | |
| Request to the Experimental Department to test two types of Champion single point sparking plugs. | 10th Nov 1920 | Box 35 \ 3 scan 123 | |
| On overoiling and faulty ignition in post-war cars, discussing ignition plug performance and potential replacements. | 11th Nov 1920 | Box 35 \ 3 scan 124 | |
| Urgent request to order 4 dozen 22mm Champion sparking plugs for American cars being experimented with. | 25th Nov 1920 | Box 35 \ 3 scan 125 | |
| Request for a report on the behaviour of Champion and Cooke sparking plugs in the School Car engine. | 22th Dec 1920 | Box 35 \ 3 scan 126 | |
| Request to obtain two Champion Spark Plug Cleaners. | 6th Jan 1921 | Box 35 \ 3 scan 127 | |
| Dispatch of a Champion Minute Sparking Plug Cleaner and its fitting specifications. | 18th Jan 1922 | Box 35 \ 3 scan 128 | |
| The test procedures for various makes of sparking plugs. | 2nd Feb 1921 | Box 35 \ 3 scan 129 | |
| Test results table for various types of spark plugs. | 9th Feb 1921 | Box 35 \ 3 scan 130 | |
| Report comparing test results for Mercury, Champion, and Bethlehem spark plugs. | 9th Feb 1921 | Box 35 \ 3 scan 131 | |
| Confirming a quote from the Champion Spark Plug Co. for GB3 type plugs and repairs. | 12th Feb 1921 | Box 35 \ 3 scan 132 | |
| Comparing the performance and design of various brands of sparking plugs, including Mercury, Champion, and Lodge. | 16th Feb 1921 | Box 35 \ 3 scan 133 | |
| Decision to standardize Champion (Canadian) and Mercury (Birmingham) parts for U.S.A. and English made cars respectively. | 16th Feb 1921 | Box 35 \ 3 scan 134 | |
| Selection, purchase, and testing of different brands of spark plugs for various car markets. | 2nd Feb 1921 | Box 35 \ 3 scan 135 | |
| Proposal for repairing 'Mercury' plugs to reduce costs and improve availability for works' use. | 10th Dec 1920 | Box 35 \ 3 scan 136 | |
| Letter from Rolls-Royce of American, Inc. discussing the switch from Bethlehem to Champion A-63 spark plugs due to performance issues. | 7th Mar 1921 | Box 35 \ 3 scan 137 | |
| Receipt and testing of a new type of spark plug from Champion Spark Plug Co. of Canada Ltd. | 8th Mar 1921 | Box 35 \ 3 scan 138 | |
| Receipt of a new modified type of spark plug from Champion Spark Plug Co. for testing. | 8th Mar 1921 | Box 35 \ 3 scan 139 | |
| Return of incorrectly sized spark plugs from the Champion Spark Plug Co. of Canada Ltd. | 1st Mar 1921 | Box 35 \ 3 scan 140 | |
| Suspicion that 'Mercury' plugs are causing pre-ignition due to the design of their porcelain. | 8th Mar 1921 | Box 35 \ 3 scan 141 | |
| Performance of Champion and Mercury ignition plugs and proposing design modifications. | 12th Apr 1921 | Box 35 \ 3 scan 142 | |
| Properties of steel versus yellow brass for a specific purpose. | 12th Apr 1921 | Box 35 \ 3 scan 143 | |
| Failed 'Champion' sparking plug from the lighting engine at West Wittering. | 29th Apr 1921 | Box 35 \ 3 scan 144 | |
| Recommendations on magneto and spark plug requirements for the 40/50 engine based on test results. | 5th May 1921 | Box 35 \ 3 scan 145 | |
| Continued document discussing tests on ignition coils with varying numbers of secondary turns. | 5th May 1921 | Box 35 \ 3 scan 146 | |
| Short internal memo requesting the purchase of half a dozen 'Champion' sparking plugs. | 2nd Jun 1921 | Box 35 \ 3 scan 147 | |
| Pre-ignition issues and failures related to Champion ignition plugs. | 1st Sep 1921 | Box 35 \ 3 scan 148 | |
| Spark plug selection, balancing operating temperature, and engine distribution improvements. | 9th Sep 1921 | Box 35 \ 3 scan 149 | |
| Letter discussing ignition plug pre-ignition issues and the performance of Champion plugs on dynamometer tests. | 20th Sep 1921 | Box 35 \ 3 scan 150 | |
| Proposal from Champion Spark Plug Company to supply standardized plugs for testing at less than half the current cost. | 16th Feb 1923 | Box 35 \ 3 scan 151 | |
| Letter from Champion Spark Plug Company regarding tests on new type A.64 plugs and their use on American vehicles. | 19th Feb 1923 | Box 35 \ 3 scan 152 | |
| Recommendation to obtain Champion Sparking Plugs for 20 HP & 40/50 HP chassis testing. | 19th Nov 1924 | Box 35 \ 3 scan 153 | |
| The potential standardisation of Champion Sparking Plugs on the chassis. | 3rd Dec 1924 | Box 35 \ 3 scan 154 | |
| The selection of 'Champion' plugs for the 40/50 HP model. | 4th Dec 1924 | Box 35 \ 3 scan 155 | |
| The change in standardized sparking plugs by the Champion Sparking Plug Co. | 3rd Apr 1925 | Box 35 \ 3 scan 156 | |
| Letter from Champion Sparking Plug Co Ltd about the delivery of spark plugs for inspection. | 3rd Jun 1925 | Box 35 \ 3 scan 157 | |
| Visit from a Champion Sparking Plug Co. Ltd. representative about the trial of their spark plugs. | 11th Aug 1925 | Box 35 \ 3 scan 158 | |
| Initial testing of American-made Champion sparking plugs. | 11th Aug 1925 | Box 35 \ 3 scan 159 | |
| Meeting with Champion Sparking Plug Co. Ltd. about the trial of their spark plugs. | 11th Aug 1925 | Box 35 \ 3 scan 160 | |
| Clarifying that an order of Champion Sparking Plugs was for use in Unit Test Beds, not for trial purposes. | 19th Aug 1925 | Box 35 \ 3 scan 161 | |
| Unsatisfactory test results of Champion spark plugs and a visit from their representative. | 17th Mar 1926 | Box 35 \ 3 scan 162 | |
| To the Test Department regarding a new 'Type R.4' sparking plug from Champion for unit testing. | 4th Jun 1926 | Box 35 \ 3 scan 163 | |
| Letter from Champion Sparking Plug Co. Ltd. regarding a representative's visit to discuss aero engines. | 11th May 1927 | Box 35 \ 3 scan 164 | |
| Advertisement proof for Champion Sparking Plugs, model No. 8, from advertising agent Alfred Pemberton. | 14th May 1927 | Box 35 \ 3 scan 165 | |
| Letter to The Champion Sparking Plug Co. regarding a meeting to test sample aero engine spark plugs. | 14th May 1927 | Box 35 \ 3 scan 166 | |
| Letter from Champion Sparking Plug Co. Ltd. regarding the testing of spark plugs in aero engines. | 16th May 1927 | Box 35 \ 3 scan 167 | |
| Internal request to order spark plugs from The Champion Sparking Plug Co. | 20th May 1927 | Box 35 \ 3 scan 168 | |
| Order for two types of Champion sparking plugs. | 26th May 1927 | Box 35 \ 3 scan 169 | |
| Order for two types of Champion sparking plugs. | 11th Jun 1927 | Box 35 \ 3 scan 170 | |
| Letter from Champion Sparking Plug Co. Ltd. proposing a representative's visit to discuss spark plug orders. | 15th Jun 1927 | Box 35 \ 3 scan 171 | |
| Internal order memo for Champion sparking plugs. | 16th Jun 1927 | Box 35 \ 3 scan 172 | |
| Test report comparing the performance of three different types of spark plugs in a supercharged F.X. engine. | 22th Aug 1927 | Box 35 \ 3 scan 173 | |
| Analysis of Salamanite insulators, comparing their thermal conductivity to other materials and detailing test results in Champion plugs. | 15th Sep 1927 | Box 35 \ 3 scan 174 | |
| Order of Champion sparking plugs for experimental purposes. | 15th Sep 1927 | Box 35 \ 3 scan 175 | |
| Urgent order for 6 dozen Champion Sparking plugs type R.11. | 11th Oct 1927 | Box 35 \ 3 scan 176 | |
| Running an F.10 engine on low-grade fuel and the spark plug accessibility on an F.11 engine. | 11th Oct 1927 | Box 35 \ 3 scan 177 | |
| The terminal length of sparking plugs for F.11 engines. | 31th Oct 1927 | Box 35 \ 3 scan 178 | |
| Instruction to fit Champion spark plugs on F.11 high compression engines. | 11th Nov 1927 | Box 35 \ 3 scan 179 | |
| Request to the Air Ministry to supply spare Champion R.11 sparking plugs for F-11 engines. | 4th Nov 1927 | Box 35 \ 3 scan 180 | |
| The correct fittings for sparking plugs on F.11 engines. | 7th Nov 1927 | Box 35 \ 3 scan 181 | |
| Official order for 2 dozen R.12 sparking plugs. | 6th Dec 1927 | Box 35 \ 3 scan 182 | |
| Instructing the procurement of two dozen R.12 type plugs from the Champion Sparking Plug Co. | 11th Jan 1928 | Box 35 \ 3 scan 183 | |
| Issues with R.11 Champion plugs and arranging their replacement with R.12 plugs on F-type engines. | 1st Jan 1928 | Box 35 \ 3 scan 184 | |
| Recommendation to replace R.11 spark plugs with hotter R.12 type plugs for F.XI and F.XII engines. | 17th Jan 1928 | Box 35 \ 3 scan 185 | |
| Sparking plug trouble experienced by a Vickers 'Scout' aircraft, leading to a forced landing. | 17th Jan 1928 | Box 35 \ 3 scan 186 | |
| The order of R.12 short type Champion sparking plugs for F.11 type engines, pending approval from the Air Ministry. | 19th Jan 1928 | Box 35 \ 3 scan 187 | |
| 'Hs.' to 'Roy' requesting the procurement of 6 dozen Champion R.12 spark plugs. | 20th Jan 1928 | Box 35 \ 3 scan 188 | |
| From Hs. to Roy, requesting an order be sent to the Champion Plug Co. for sparking plugs. | 20th Jan 1928 | Box 35 \ 3 scan 189 | |
| Matter of plugs and permission to adjust mixture strength with Col. Fell for an aero engine type test. | 2nd Feb 1928 | Box 35 \ 3 scan 190 | |
| Flight tests detailing ignition failures and issues with different models of Champion spark plugs. | 1st Feb 1928 | Box 35 \ 3 scan 191 | |
| Issues with armoured H.T. wires, bonding wires, and includes a sketch of a Champion plug. | 1st Feb 1928 | Box 35 \ 3 scan 192 | |
| Issues and proposed modifications for Chater-Lea H.T. wire terminals. | 1st Feb 1928 | Box 35 \ 3 scan 193 | |
| Search for suitable British-made spark plugs and the impact of plug dimensions on aircraft fuselage design. | 1st Feb 1928 | Box 35 \ 3 scan 194 | |
| List and analysis of various spark plugs for the F. engine, considering weight, length, and fitment. | 1st Feb 1928 | Box 35 \ 3 scan 195 | |
| Selection, procurement, and temporary use of various sparking plugs for F.11 engines. | 1st Feb 1928 | Box 35 \ 3 scan 196 | |
| Test report on Champion spark plugs, comparing racing and production models based on their pre-ignition characteristics. | 20th Feb 1928 | Box 35 \ 3 scan 197 | |
| Letter to the Air Ministry seeking formal approval for Modification No. 23 to F Type engines, concerning ignition terminals. | 20th Feb 1928 | Box 35 \ 3 scan 198 | |
| Query regarding the intention to retain 30 A.E.A.4 Champion Plugs. | 15th Mar 1928 | Box 35 \ 3 scan 199 | |
| Testing and unsuitability of various Champion sparking plugs for aero engines. | 23th Mar 1928 | Box 35 \ 3 scan 200 | |
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