| Description | Date | Identifier | |
| The performance and testing of Lodge Sparking Plugs on a demonstration car and dynamometer. | 17th Feb 1914 | Box 79 \ 1 scan0036 | |
| Request for test results on the new 1915 pattern 18 m/m Lodge Sparking Plug. | 21th Jan 1915 | Box 79 \ 1 scan0037 | |
| Previously sent report on Lodge Sparking Plugs. | 22th Jan 1915 | Box 79 \ 1 scan0038 | |
| Requesting a separate report on Lodge sparking plugs from the Experimental Department. | 25th Jan 1915 | Box 79 \ 1 scan0039 | |
| Internal query regarding a response about Bosch plugs. | 4th Feb 1915 | Box 79 \ 1 scan0040 | |
| Extract from a letter by chauffeur Arthur Botting to Mrs. Smith regarding the use of Bosch Plugs. | 2nd Feb 1915 | Box 79 \ 1 scan0041 | |
| Switching from German Bosch spark plugs to Lodge plugs due to wartime material shortages. | 8th Feb 1915 | Box 79 \ 1 scan0042 | |
| The testing of a new model, which is deemed less satisfactory than the old one but still the best currently obtainable. | 11th Sep 1915 | Box 79 \ 1 scan0043 | |
| Chasing the Experimental Department's report on Lodge Sparking Plugs. | 11th Sep 1915 | Box 79 \ 1 scan0044 | |
| Reply regarding Lodge Sparking Plugs. | 18th Feb 1915 | Box 79 \ 1 scan0045 | |
| Follow-up letter regarding correspondence from Botting about Bosch Plugs. | 16th Dec 1914 | Box 79 \ 1 scan0046 | |
| Confirming a previous reply regarding plugs of German manufacture. | 20th Feb 1915 | Box 79 \ 1 scan0047 | |
| Chasing an overdue Experimental Department report on Lodge Sparking Plugs. | 23th Feb 1915 | Box 79 \ 1 scan0048 | |
| The testing of Lodge Sparking Plugs. | 24th Feb 1915 | Box 79 \ 1 scan0049 | |
| Experimental Department report on Lodge Sparking Plugs. | 4th Mar 1915 | Box 79 \ 1 scan0050 | |
| Engine pre-ignition issues caused by standard Lodge plugs, with a resolution using mica-insulated Lodge Aero plugs. | 8th Mar 1916 | Box 79 \ 1 scan0051 | |
| Issues with an overheated and cracked Lodge spark plug, suggesting alternatives and further action. | 11th Mar 1915 | Box 79 \ 1 scan0052 | |
| Report on the C.2 type Lodge Sparking Plugs. | 15th Mar 1915 | Box 79 \ 1 scan0053 | |
| Enquiry about Lodge Ignition Plugs. | 25th Mar 1915 | Box 79 \ 1 scan0054 | |
| The unsatisfactory performance and various troubles experienced with Lodge ignition plugs during testing. | 25th Mar 1915 | Box 79 \ 1 scan0055 | |
| Performance of different ignition plugs, comparing them to the Bosch type and suggesting tests on Lodge 'Mica' type plugs. | 25th Mar 1915 | Box 79 \ 1 scan0056 | |
| Urgent request for a report on the type C.2 Lodge Sparking Plugs. | 25th Mar 1915 | Box 79 \ 1 scan0057 | |
| Lodge Sparking Plugs, type C.2 X.601, recommending their adoption as standard. | 26th Mar 1915 | Box 79 \ 1 scan0058 | |
| Sparking plug failures and excessive lubrication issues in the 225 HP Aero Engine. | 12th Jul 1915 | Box 79 \ 1 scan0059 | |
| Extract discussing the failure of Lodge porcelain sparking plugs and potential causes. | 12th Jul 1915 | Box 79 \ 1 scan0060 | |
| Issues with sparking plugs following a meeting with a Lodge representative. | 9th Nov 1915 | Box 79 \ 1 scan0061 | |
| Design and performance of different types of spark plugs, specifically comparing mica and pot insulation. | 12th Oct 1912 | Box 79 \ 1 scan0062 | |
| Cover memo forwarding a letter from Lodge Sparking Plug Co. and a memo from Mr. Nadin to Mr. Hives for his remarks. | 21th Dec 1915 | Box 79 \ 1 scan0063 | |
| Communication with the Lodge Sparking Plug Company, attaching their reply and asking for instructions. | 20th Dec 1915 | Box 79 \ 1 scan0064 | |
| Letter from The Lodge Sparking Plug Co. regarding issues with over-heating in Model 'K' plugs. | 18th Dec 1915 | Box 79 \ 1 scan0065 | |
| Letter from The Lodge Sparking Plug Co., Ltd. regarding the need for performance information to modify spark plug designs. | 12th Oct 1915 | Box 79 \ 1 scan0066 | |
| Successful use of Lodge model K spark plugs on the 75 HP and 250 HP engines. | 8th Jan 1916 | Box 79 \ 1 scan0067 | |
| Standardization of Lodge Racing Air-Cooled plugs to resolve an overoiling issue. | 4th Sep 1916 | Box 79 \ 1 scan0068 | |
| Extract regarding complaints about Lodge sparking plugs on the 'Eagle' engine. | 24th Aug 1916 | Box 79 \ 1 scan0069 | |
| Sparking plug troubles on the 300 HP Eagle 'B' Engine. | 6th Sep 1916 | Box 79 \ 1 scan0070 | |
| The supply and ordering of Lodge model 'K' sparking plugs. | 1st Nov 1916 | Box 79 \ 1 scan0071 | |
| The performance and ordering of Lodge Sparking Plugs, with a specification change for the shank gap. | 4th Nov 1916 | Box 79 \ 1 scan0072 | |
| Letter from The Lodge Sparking Plug Co. Ltd. regarding spark plug orders and gap size alterations. | 28th Nov 1916 | Box 79 \ 1 scan0073 | |
| Agreeing to a new spark gap for Model 'K' Lodge Sparking Plugs but criticising the lack of consultation. | 28th Nov 1916 | Box 79 \ 1 scan0074 | |
| To Mr. Clark regarding an instruction to the Lodge Sparking Plug Co. to proceed with a spark plug order as is, due to tooling delays. | 29th Nov 1916 | Box 79 \ 1 scan0075 | |
| Orders for Lodge Sparking Plugs with different spark gap specifications. | 5th Dec 1916 | Box 79 \ 1 scan0076 | |
| Complaint about the uniformity of spark plug gaps and the supplier's feedback on new specifications. | 18th Dec 1916 | Box 79 \ 1 scan0077 | |
| Specified gap for Lodge sparking plugs, justifying the 15/1000 inch measurement. | 20th Dec 1916 | Box 79 \ 1 scan0078 | |
| Agreeing to an order for Lodge sparking plugs with a specified minimum annular gap. | 2nd Dec 1919 | Box 79 \ 1 scan0079 | |
| Specified gap for a new batch order of Lodge sparking plugs. | 21th Dec 1916 | Box 79 \ 1 scan0080 | |
| Letter discussing sparking plug gap size specifications and associated tooling costs with supplier Lodge. | 3rd Jan 1917 | Box 79 \ 1 scan0081 | |
| Letter quoting correspondence from Lodge Sparking Plug Co. Ltd. regarding their 1917 catalogue. | 4th Jan 1917 | Box 79 \ 1 scan0082 | |
| Gap size variation for Lodge Racing Sparking Plugs and agreeing to experimental results. | 9th Jan 1917 | Box 79 \ 1 scan0083 | |
| Letter from The Lodge Sparking Plug Co. Ltd. discussing the manufacturing tolerances for aeroplane spark plug gaps. | 12th Jan 1917 | Box 79 \ 1 scan0084 | |
| Seeking clarification on the specified limits for sparking plug air gaps. | 15th Jan 1917 | Box 79 \ 1 scan0085 | |
| Letter clarifying the required tolerance for the gaps in annular gap Lodge plugs. | 25th Jan 1917 | Box 79 \ 1 scan0086 | |
| Letter from The Lodge Sparking Plug Co. Ltd. awaiting instructions on spark plug annular ring design. | 15th Feb 1916 | Box 79 \ 1 scan0087 | |
| Correspondence regarding the supply and gap tolerance of Lodge spark plugs. | 2nd Feb 1917 | Box 79 \ 1 scan0088 | |
| Letter regarding the dispatch of spark plugs and proposed modifications to camshaft casings to fix oil leaks on a D.H.4. | 22th May 1917 | Box 79 \ 1 scan0089 | |
| Extract discussing issues with K.L.G. and Lodge spark plugs in an experimental 'C' engine. | 22th May 1917 | Box 79 \ 1 scan0090 | |
| Piston ring performance and engine oiling issues, particularly at high altitudes in aeroplanes. | 15th Jun 1917 | Box 79 \ 1 scan0091 | |
| Efficacy of multi-ringed pistons in holding back oil, particularly for use on inverted engines. | 25th Aug 1917 | Box 79 \ 1 scan0092 | |
| Effectiveness of Multi Ring Pistons in addressing over-oiling issues in engines. | 28th Jun 1917 | Box 79 \ 1 scan0093 | |
| Cover note for Mr. Hives, attaching a copy of a memo from Mr. Evans. | 20th Feb 1918 | Box 79 \ 1 scan0094 | |
| Visit to Martinsydes concerning a Falcon 3 engine, propeller trials, and spark plug performance. | 20th Feb 1918 | Box 79 \ 1 scan0095 | |
| Clarifying the correct Lodge sparking plug type (K.R.3) to avoid confusion with an older, problematic model (K.R.). | 15th May 1918 | Box 79 \ 1 scan0096 | |
| New method for testing spark plugs from various manufacturers and proposing it to the Air Board. | 30th May 1918 | Box 79 \ 1 scan0097 | |
| Continued report discussing cracking issues with porcelain spark plugs due to heat expansion. | 30th May 1918 | Box 79 \ 1 scan0098 | |
| Letter to The Lodge Sparking Plug Co. Ltd. regarding the testing of special K.R.S. sparking plugs. | 6th Jun 1918 | Box 79 \ 1 scan0099 | |
| Letter from The Lodge Sparking Plug Co. Ltd. regarding the supply of special KR3 plugs for engine testing. | 7th Jun 1918 | Box 79 \ 1 scan0100 | |
| Letter from The Lodge Sparking Plug Company regarding four Model SM plugs. | 15th Jun 1918 | Box 79 \ 1 scan0101 | |
| Letter from The Lodge Sparking Plug Co. Ltd. regarding the testing of new spark plug models. | 15th Jun 1918 | Box 79 \ 1 scan0102 | |
| Letter to The Lodge Sparking Plug Co. detailing test results of 4 special sparking plugs. | 24th Jun 1918 | Box 79 \ 1 scan0103 | |
| Continuation of a letter discussing issues with a spark plug's copper electrode and requesting a special plug for an endurance test. | 26th Jun 1918 | Box 79 \ 1 scan0104 | |
| Letter from The Lodge Sparking Plug Company Limited concerning the testing and supply of spark plugs. | 26th Jun 1918 | Box 79 \ 1 scan0105 | |
| Letter from The Lodge Sparking Plug Co. Ltd. regarding the delayed return of 4 Lodge Model 'SM' plugs. | 28th Jun 1918 | Box 79 \ 1 scan0106 | |
| Letter from the Lodge Sparking Plug Company Limited regarding the failure analysis of experimental Model SM plugs. | 1st Jul 1918 | Box 79 \ 1 scan0107 | |
| Letter from Lodge Sparking Plug Co. Ltd. regarding the despatch of 12 KR4 plugs. | 1st Jul 1918 | Box 79 \ 1 scan0108 | |
| Letter from The Lodge Sparking Plug Company regarding one dozen Model KR4 plugs sent for a 100-hour endurance test. | 4th Jul 1918 | Box 79 \ 1 scan0109 | |
| Invoice from The Lodge Sparking Plug Co. Ltd. for twelve Lodge Model 'KR4' Sparking Plugs. | 3rd Jul 1918 | Box 79 \ 1 scan0110 | |
| Packing slip from The Lodge Sparking Plug Co. Ltd. for twelve 'KR4' model sparking plugs. | 3rd Jul 1918 | Box 79 \ 1 scan0111 | |
| Letter to The Lodge Sparking Plug Co. regarding the failure of a special KR3 plug and suggesting a design improvement. | 6th Jul 1918 | Box 79 \ 1 scan0112 | |
| Letter from The Lodge Sparking Plug Company regarding the failure and repair of 12 Model KR4 plugs. | 10th Jul 1918 | Box 79 \ 1 scan0113 | |
| Letter from The Lodge Sparking Plug Company regarding the reconstruction and delivery of 12 Model KR4 plugs. | 11th Jul 1918 | Box 79 \ 1 scan0114 | |
| Letter from The Lodge Sparking Plug Company arranging a visit to discuss the supply and testing of experimental plugs. | 16th Jul 1918 | Box 79 \ 1 scan0115 | |
| Letter to The Lodge Sparking Plug Co regarding the performance testing of new KM4 spark plugs in an Eagle engine. | 16th Jul 1918 | Box 79 \ 1 scan0116 | |
| Letter from The Lodge Sparking Plug Co. Ltd. regarding an order for 2 dozen special KR4 plugs. | 19th Jul 1918 | Box 79 \ 1 scan0117 | |
| Letter from The Lodge Sparking Plug Company enquiring about the performance of new KR4 plugs on test. | 29th Jul 1918 | Box 79 \ 1 scan0118 | |
| Letter to The Lodge Sparking Plug Co. Ltd. regarding the performance and further supply of special KR4 spark plugs. | 30th Jul 1918 | Box 79 \ 1 scan0119 | |
| Letter from The Lodge Sparking Plug Company regarding the testing and supply of KR4 plugs. | 31th Jul 1918 | Box 79 \ 1 scan0120 | |
| To Mr. Hives regarding KR5 Sparking Plugs sent for approval from the Lodge Sparking Plug Co. | 12th Aug 1918 | Box 79 \ 1 scan0121 | |
| Letter from The Lodge Sparking Plug Company requesting tests on new model KR5 spark plugs. | 2nd Aug 1918 | Box 79 \ 1 scan0122 | |
| Letter from The Lodge Sparking Plug Company regarding the sending and testing of KR4 and KR5 model spark plugs. | 14th Aug 1918 | Box 79 \ 1 scan0123 | |
| Letter from The Lodge Sparking Plug Co. Ltd. concerning comparative tests of various spark plug models. | 14th Aug 1918 | Box 79 \ 1 scan0124 | |
| Letter to The Lodge Sparking Plug Co. Ltd. regarding the return of faulty spark plugs. | 15th Aug 1918 | Box 79 \ 1 scan0125 | |
| Letter to The Lodge Sparking Plug Co. regarding issues and feedback on different spark plug models. | 16th Aug 1918 | Box 79 \ 1 scan0126 | |
| Letter from The Lodge Sparking Plug Company concerning the testing of experimental KR4 and KR5 sparking plugs. | 31th Aug 1918 | Box 79 \ 1 scan0127 | |
| Letter from The Lodge Sparking Plug Co. Ltd. regarding the development and testing of new experimental plugs. | 31th Aug 1918 | Box 79 \ 1 scan0128 | |
| Letter from The Lodge Sparking Plug Co. regarding the supply of experimental KR3 plugs with a new insulating material for testing, due to a shortage of mica. | 5th Sep 1918 | Box 79 \ 1 scan0129 | |
| Letter to The Lodge Sparking Plug Co. regarding the return and performance of KR5 spark plugs, detailing issues with pre-ignition. | 5th Sep 1918 | Box 79 \ 1 scan0130 | |
| Letter discussing engine spark plug endurance testing and a planned visit. | 1st Sep 1918 | Box 79 \ 1 scan0131 | |
| Letter from The Lodge Sparking Plug Company regarding testing and supply of various spark plug models. | 12th Sep 1918 | Box 79 \ 1 scan0132 | |
| Letter from L.S.P. Co. Ltd. discussing specifications and testing proposals for various spark plug models. | 12th Sep 1918 | Box 79 \ 1 scan0133 | |
| Letter from The Lodge Sparking Plug Co. Ltd. regarding the supply and testing of KR3 spark plugs. | 12th Sep 1918 | Box 79 \ 1 scan0134 | |
| Fuel consumption tests, carburetter development, and sparking plug issues for the 'Condor' engine. | 13th Sep 1918 | Box 79 \ 1 scan0135 | |
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