| Description | Date | Identifier | |
| K.L.G. plugs received from the Paris Depot for a Trials Car, to be handed to the Experimental Department. | 9th Dec 1938 | Box 162 \ 5 img091 | |
| Wear on a set of sparking plugs and requesting further details on their usage conditions and mileage. | 16th Dec 1938 | Box 162 \ 5 img092 | |
| Letter to Bentley Motors Ltd. regarding worn spark plugs from a trials car, chassis B.35.KU. | 20th Dec 1938 | Box 162 \ 5 img093 | |
| Internal request to obtain 4 dozen K.L.G. type 827 sparking plugs. | 29th Dec 1938 | Box 162 \ 5 img094 | |
| KLG ignition plug that was removed from a Bentley due to misfiring when accelerating. | 12th Jan 1939 | Box 162 \ 5 img095 | |
| The testing and performance of K.L.G. FLB.50.X type spark plugs on Bentley cars. | 23th Jan 1939 | Box 162 \ 5 img096 | |
| Photograph of a broken two-piece spark plug. | 23th Jan 1939 | Box 162 \ 5 img097 | |
| Photograph of a broken spark plug, shown in two pieces. | 25th Apr 1939 | Box 162 \ 5 img098 | |
| Letter from K.L.G. Sparking Plugs regarding the manufacture of twelve FIB.30x plugs with platinum iridium tips. | 25th Apr 1939 | Box 162 \ 5 img099 | |
| Letter to K.L.G. Sparking Plugs Ltd. acknowledging the receipt of twelve platinum iridium tipped sparking plugs for testing. | 28th Apr 1939 | Box 162 \ 5 img100 | |
| Letter from K.L.G Sparking Plugs Ltd. to Bentley Motors Ltd. seeking confirmation that their plugs were used in a record-breaking car at Brooklands. | 11th Aug 1939 | Box 162 \ 5 img101 | |
| Letter to K.L.G. Sparking Plugs Ltd. confirming the plug model fitted to a Bentley car. | 22th Aug 1939 | Box 162 \ 5 img102 | |
| Letter from K.L.G. Sparking Plugs Limited acknowledging receipt of an earlier letter. | 23th Aug 1939 | Box 162 \ 5 img103 | |
| Letter to K.L.G. Sparking Plug Co. Ltd. requesting a hotter running plug due to issues caused by poor quality petrol. | 24th Feb 1940 | Box 162 \ 5 img104 | |
| Letter from K.L.G. Sparking Plugs Limited regarding a follow-up meeting. | 6th Mar 1940 | Box 162 \ 5 img105 | |
| Letter from K.L.G. Sparking Plugs Ltd. regarding the development and testing of face-firing spark plugs. | 7th Jun 1940 | Box 162 \ 5 img106 | |
| Querying test bed results for KLG spark plugs and noting readiness to run Lodge plugs. | 26th Aug 1940 | Box 162 \ 5 img107 | |
| Internal request to purchase 1 gross of 14 mm plug washers from K.L.G. Sparking Plugs Ltd. | 20th Dec 1940 | Box 162 \ 5 img108 | |
| Letter from K.L.G Sparking Plugs confirming they can improve the FLB.30x plug and will investigate a rival plug. | 15th May 1941 | Box 162 \ 5 img109 | |
| Letter to K.L.G. Sparking Plug, Ltd. regarding the performance of their spark plugs compared to Champion models and requesting a trial set. | 10th May 1941 | Box 162 \ 5 img110 | |
| Request to order sealing washers and distance pieces from KLG Sparking Plugs Ltd. | 17th Feb 1942 | Box 162 \ 5 img111 | |
| Letter from Lodge Plugs Limited requesting the results of tests on special Steatite Plugs. | 21th Jan 1921 | Box 162 \ 6 img001 | |
| Follow-up letter from Lodge Plugs Limited regarding a quotation for new pattern all-steatite plugs. | 8th Sep 1921 | Box 162 \ 6 img002 | |
| Letter from Lodge Plugs Limited confirming a proposed meeting time with Mr. Hives. | 16th Sep 1921 | Box 162 \ 6 img003 | |
| Request to order 3 dozen Lodge sparking plugs with steatite insulation for experimental purposes. | 3rd Oct 1921 | Box 162 \ 6 img004 | |
| Testing and potential use of Lodge X601 sparking plugs. | 1st Oct 1921 | Box 162 \ 6 img005 | |
| Instructing the Stores to despatch a sample Lodge Sparking Plug to Mr. Royce for examination. | 10th Oct 1921 | Box 162 \ 6 img006 | |
| Letter from Lodge Plugs regarding Long Reach Plugs and a new all-steatite plug. | 26th Oct 1920 | Box 162 \ 6 img007 | |
| Covering memo for a standardisation sheet concerning experiment X.4425 on Lodge Steatite Plugs. | 1st Oct 1921 | Box 162 \ 6 img008 | |
| Standardisation sheet for Lodge Steatite Plugs, requesting cost details. | 31th Oct 1921 | Box 162 \ 6 img009 | |
| Cover note for a standardisation sheet regarding Lodge Steatite Plugs. | 31th Oct 1921 | Box 162 \ 6 img010 | |
| Cover memo for a standardisation sheet concerning an experiment on Lodge Steatite Plugs, Model Z.22. | 16th Nov 1921 | Box 162 \ 6 img011 | |
| Cover letter forwarding correspondence from The Lodge Plugs Limited regarding an order for 3 dozen spark plugs. | 19th Nov 1921 | Box 162 \ 6 img012 | |
| Copy of a letter from The Lodge Plugs Limited asking for feedback on the performance of their Steatite Plugs. | 17th Nov 1921 | Box 162 \ 6 img013 | |
| Standardisation of chassis parts for the adoption of Lodge Steatite Plugs, model L.22. | 31th Oct 1921 | Box 162 \ 6 img014 | |
| Letter to The Lodge Sparking Plug Co. regarding the return of 6 fused Steatite Sparking Plugs from a small car engine. | 5th Dec 1921 | Box 162 \ 6 img015 | |
| Despatch of 6 sparking plugs to The Lodge Sparking Plug Co. Ltd. for examination and testing. | 12th Dec 1921 | Box 162 \ 6 img016 | |
| Letter from Lodge Plugs Limited regarding the fusing of glaze on Model C plugs during engine testing. | 8th Dec 1921 | Box 162 \ 6 img017 | |
| Letter from L.S.P. Co. Ltd. discussing the performance, testing, and materials of spark plugs. | 8th Dec 1921 | Box 162 \ 6 img018 | |
| Page 2 of a letter from Lodge Plugs Limited awaiting a reply and enclosing a credit note. | 8th Dec 1912 | Box 162 \ 6 img019 | |
| Credit note memorandum regarding the return of 6 Lodge Sparking plugs to Messrs. Lodge Ltd. | 12th Dec 1921 | Box 162 \ 6 img020 | |
| Letter from Lodge Plugs Limited concerning the exchange and features of spark plugs for racing engines. | 12th Dec 1921 | Box 162 \ 6 img021 | |
| Invoice from Lodge Plugs Limited for the supply of six model 'Z27' sparking plugs. | 12th Dec 1921 | Box 162 \ 6 img022 | |
| Letter to The Lodge Sparking Plug Co. Ltd. regarding the failure of spark plugs due to overheating and requesting different insulators. | 13th Dec 1921 | Box 162 \ 6 img023 | |
| Letter to The Lodge Sparking Plug Co. Ltd. regarding the failure of Z27 plugs and a request for more to test. | 25th Jan 1922 | Box 162 \ 6 img024 | |
| Instructing the Stores to despatch 6 sparking plugs to Messrs. Lodge, Rugby for testing. | 19th Feb 1921 | Box 162 \ 6 img025 | |
| Correspondence with the Lodge company about sparking plugs. | 7th Feb 1922 | Box 162 \ 6 img026 | |
| Letter to The Lodge Sparking Plug Co. regarding the partial return of plugs as one has been mislaid. | 7th Feb 1922 | Box 162 \ 6 img027 | |
| Letter from Lodge Plugs Limited discussing the testing results of experimental spark plugs. | 9th Feb 1922 | Box 162 \ 6 img028 | |
| Page 2 of a letter from Lodge Plugs Ltd regarding the insulator shape of their spark plugs. | 9th Feb 1922 | Box 162 \ 6 img029 | |
| Requesting an order for 500 Lodge Steatite sparking plugs for testing on the 40/50 chassis. | 2nd Feb 1922 | Box 162 \ 6 img030 | |
| Letter to The Lodge Sparking Plug Co. regarding Steatite Sparking Plugs and a request for more for testing. | 14th Feb 1922 | Box 162 \ 6 img031 | |
| Letter from Lodge Plugs Limited regarding the dispatch of 6 Model CD Lodge plugs. | 16th Feb 1922 | Box 162 \ 6 img032 | |
| Letter regarding a communication from Lodge Plugs Ltd. and the dispatch of a dozen Model CD.2 Plugs. | 9th Mar 1922 | Box 162 \ 6 img033 | |
| Letter from Lodge Plugs Ltd. regarding the delayed despatch of an order to send a new experimental plug model. | 8th Mar 1922 | Box 162 \ 6 img034 | |
| Reliability of Lodge porcelain and K.L.G. mica ignition plugs for the Goshawk engine. | 1st Jul 1922 | Box 162 \ 6 img035 | |
| Procedure for replacing Mercury plugs with Lodge plugs due to a supply shortage. | 20th Jul 1922 | Box 162 \ 6 img036 | |
| The replacement of Mercury ignition plugs with Lodge steatite plugs for the 40/50 Chassis. | 2nd Oct 1922 | Box 162 \ 6 img037 | |
| Letter from Lodge Plugs Limited recommending their Model C.56 Steatite Plug following tests on 20 HP and 40/50 HP engines. | 12th Oct 1922 | Box 162 \ 6 img038 | |
| Letter from Lodge Plugs Limited requesting an order quantity for C.56 Steatite Plugs. | 12th Oct 1922 | Box 162 \ 6 img039 | |
| Letter from Lodge Plugs Limited regarding tests on a new C.56 plug. | 27th Oct 1922 | Box 162 \ 6 img040 | |
| Inquiry from The Lodge Sparking Plug Co. about a 20-HP Sparking Plug sample. | 4th Dec 1922 | Box 162 \ 6 img041 | |
| Requesting an order for 1000 C.56 Lodge Steartite ignition plugs for the 40/50 chassis. | 12th Jan 1923 | Box 162 \ 6 img042 | |
| Manufacturing fault with C.56 Lodge plugs for the 40/50 chassis, and the subsequent investigation. | 22th Jan 1928 | Box 162 \ 6 img043 | |
| Sourcing Steatite from Messrs. Lucas to enable the experimental manufacture of plugs. | 23th Jan 1923 | Box 162 \ 6 img044 | |
| Standardising the C.56 Lodge ignition plug for 40/50 & Goshawk engines, following a discussion with Mr. Royce. | 23th Jan 1923 | Box 162 \ 6 img045 | |
| Failure of experimental C.56 Lodge Plugs and confirming the continued use of K.L.G. plugs. | 6th Mar 1923 | Box 162 \ 6 img046 | |
| Letter to Lodge (Sparking Plug Co.) regarding issues with C.56 type sparking plugs. | 6th Mar 1923 | Box 162 \ 6 img047 | |
| Sending seven type C.56 sparking plugs to Messrs. Lodge, Rugby for inspection. | 9th Mar 1923 | Box 162 \ 6 img048 | |
| Letter from Lodge Plugs Limited regarding issues with C56 type plugs experiencing sooting and loose insulators. | 13th Mar 1923 | Box 162 \ 6 img049 | |
| Letter from Lodge Plugs Limited regarding the examination of returned plugs. | 13th Mar 1923 | Box 162 \ 6 img050 | |
| Letter to The Lodge Sparking Plug Co. regarding the return of C.56 plugs from a recent delivery. | 14th Mar 1923 | Box 162 \ 6 img051 | |
| Letter from Lodge Plugs Limited concerning the investigation of returned 7 C56 plugs. | 22th Mar 1923 | Box 162 \ 6 img052 | |
| The company's lack of experience with Lodge Spark Gap Terminals. | 27th Apr 1923 | Box 162 \ 6 img053 | |
| Confirming the dispatch of 24 model C.G. Lodge Sparking Plugs for reporting. | 14th May 1923 | Box 162 \ 6 img054 | |
| Invoice from Lodge Plugs Limited for 24 model C65 sparking plugs, free of charge. | 4th Jun 1923 | Box 162 \ 6 img055 | |
| Packing slip from Lodge Plugs Limited for the supply of 24 C65 model sparking plugs. | 4th Jun 1923 | Box 162 \ 6 img056 | |
| Supplying one dozen Lodge C.65.103 steatite sparking plugs for testing. | 11th Jun 1923 | Box 162 \ 6 img057 | |
| The submission of Lodge Sparking Plugs to the Test Department. | 11th Jun 1923 | Box 162 \ 6 img058 | |
| Stock of Z22 sparking plugs and their potential replacement with the C65.103 type for the 40/50 chassis. | 22th Jun 1923 | Box 162 \ 6 img059 | |
| Testing and selection of alternative ignition plugs for the 40/50 chassis. | 25th Jun 1923 | Box 162 \ 6 img060 | |
| Complaints and failures of faulty Lodge spark plugs during road and unit testing. | 25th Feb 1924 | Box 162 \ 6 img061 | |
| Letter from Lodge Plugs Ltd. discussing defects in steatite plugs and the supply of replacements. | 4th May 1924 | Box 162 \ 6 img062 | |
| Faulty Lodge spark plugs, discussing their failure during testing, and a dispute over their usage conditions. | 6th Mar 1924 | Box 162 \ 6 img063 | |
| Request to send one dozen Lodge porcelain ignition plugs for garage use, as per Mr. Royce's wishes. | 11th Oct 1924 | Box 162 \ 6 img064 | |
| Clarifying a fault with Lodge plugs was misfiring, not pre-ignition, and requesting more for testing on the Goshawk engine. | 24th Nov 1924 | Box 162 \ 6 img065 | |
| From Hs. to E. clarifying a request from R. for 12 Lodge Sparking Plugs. | 20th Nov 1924 | Box 162 \ 6 img066 | |
| From ROY confirming the dispatch of 12 plugs following a conversation. | 10th Feb 1925 | Box 162 \ 6 img067 | |
| Letter from Lodge Plugs Limited regarding new detachable steatite sparking plugs for testing. | 6th Feb 1925 | Box 162 \ 6 img068 | |
| Comparison report on the performance of Lodge and A.C. Sphinx spark plugs. | 18th Feb 1925 | Box 162 \ 6 img069 | |
| Receipt of new Lodge Company spark plugs for testing. | 23th Feb 1925 | Box 162 \ 6 img070 | |
| Communication from The Lodge Company, Rugby, requesting test results for steatite and mica spark plugs. | 16th Apr 1925 | Box 162 \ 6 img071 | |
| Letter from Lodge Plugs Limited requesting reports on the testing of detachable steatite and mica spark plugs. | 6th May 1925 | Box 162 \ 6 img072 | |
| From ROY regarding a conversation with Mr. Hopps and the dispatch of modified plugs from Lodge Plugs Ltd. | 27th May 1925 | Box 162 \ 6 img073 | |
| Letter from Lodge Plugs regarding the supply of sample Model 200 and No. 201 spark plugs. | 26th May 1925 | Box 162 \ 6 img074 | |
| Letter from Lodge Plugs Limited following up on the testing of detachable steatite plugs. | 5th Jun 1925 | Box 162 \ 6 img075 | |
| Letter to Messrs. Lodge regarding the testing of detachable steatite sparking plugs. | 8th Jun 1925 | Box 162 \ 6 img076 | |
| Letter from Lodge Plugs Limited regarding test results for detachable steatite plugs. | 10th Jun 1925 | Box 162 \ 6 img077 | |
| Request for two dozen of the latest porcelain cleanable plugs for the New Phantom and Goshawk models. | 26th Jun 1925 | Box 162 \ 6 img078 | |
| Despatch of a dozen Lodge Sparking Plugs to Mr. Royce for experimental use. | 30th Jun 1925 | Box 162 \ 6 img079 | |
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