| Description | Date | Identifier | |
| Follow-up letter from K.L.G Sparking Plugs Limited regarding a booklet proof. | 15th Jul 1935 | Box 162 \ 4 img099 | |
| Order for K.L.G. type 724 sparking plugs. | 16th Jul 1935 | Box 162 \ 4 img100 | |
| To find and order suitable replacement spark plugs for a Buick. | 7th Aug 1935 | Box 162 \ 4 img101 | |
| Trouble with re-conditioned sparking plugs. | 12th Aug 1935 | Box 162 \ 4 img102 | |
| Issues of oiling up and misfiring caused by reconditioned spark plugs. | 9th Aug 1935 | Box 162 \ 4 img103 | |
| Spark plug issues, including oiling up and misfiring, in new cars and a comparison of different plug types. | 13th Aug 1935 | Box 162 \ 4 img104 | |
| Excessive oiling up of sparking plugs on a Bentley chassis and proposing a new K.L.G. 850 plug for testing. | 13th Aug 1935 | Box 162 \ 4 img105 | |
| The despatch of 6 K.L.G. type 850 sparking plugs for testing. | 14th Aug 1935 | Box 162 \ 4 img106 | |
| Letter to K.L.G. Sparking Plugs Ltd. requesting a redesign of the 886 and 868 spark plugs. | 14th Aug 1935 | Box 162 \ 4 img107 | |
| Misfiring and oiling up issues with KLG 765.A sparking plugs on Bentley chassis. | 15th Aug 1935 | Box 162 \ 4 img108 | |
| Receipt and fitting of six KLG type 850 sparking plugs to address a misfiring issue. | 17th Aug 1935 | Box 162 \ 4 img109 | |
| Misfiring KLG type 765.A spark plugs on chassis B.139.CW and their replacement with experimental KLG 850 plugs. | 17th Aug 1935 | Box 162 \ 4 img110 | |
| Surplus delivery of washers against a purchase order from K.L.G. Sparking Plugs Ltd. | 19th Aug 1935 | Box 162 \ 4 img111 | |
| Letter from K.L.G Sparking Plugs regarding the supply of type 850 plugs and discussing tests on types 765-A and 850. | 20th Aug 1935 | Box 162 \ 4 img112 | |
| Dispatch note from K.L.G. Sparking Plugs Limited for test plugs. | 20th Aug 1935 | Box 162 \ 4 img113 | |
| Pre-ignition issues with Bentley sparking plugs caused by mica flaking. | 23th Aug 1935 | Box 162 \ 4 img114 | |
| Letter to K.L.G. Sparking Plugs, Ltd. regarding plugs that have not yet been received. | 24th Aug 1935 | Box 162 \ 4 img115 | |
| Letter from K.L.G. Sparking Plugs Limited apologising for a delay in dispatching plugs. | 26th Aug 1935 | Box 162 \ 4 img116 | |
| Invoice from K.L.G. Sparking Plugs, Ltd and requesting authorisation for payment. | 28th Aug 1935 | Box 162 \ 4 img117 | |
| Letter to K.L.G. Sparking Plugs regarding plugs that arrived too late to be fitted to a customer's car. | 28th Aug 1935 | Box 162 \ 4 img118 | |
| To Roy requesting an order for one dozen K.L.G. 843 Sparking Plugs. | 30th Aug 1935 | Box 162 \ 4 img119 | |
| Standardisation of K.L.G. Type 850 sparking plugs. | 13th Aug 1935 | Box 162 \ 4 img120 | |
| Complaints about Bentley sparking plugs and urging the adoption of a new standardized type. | 23th Oct 1935 | Box 162 \ 4 img121 | |
| Order for 4 K.L.G. type 897 sparking plugs. | 23th Oct 1935 | Box 162 \ 4 img122 | |
| Letter to K.L. Guiness Sparking Plug Co. Ltd. regarding complaints about Bentley sparking plugs and proposing a switch to the type 850 plug. | 24th Oct 1935 | Box 162 \ 4 img123 | |
| Requesting the posting of two faulty 868D sparking plugs for examination. | 24th Oct 1935 | Box 162 \ 4 img124 | |
| Letter to K.L.G. Sparking Plugs regarding the failure of a type 843 spark plug during testing on a 20/25 engine. | 30th Oct 1935 | Box 162 \ 4 img125 | |
| Letter from K.L.G Sparking Plugs Limited arranging a meeting with Mr. West. | 15th Nov 1935 | Box 162 \ 4 img126 | |
| Letter from K.L.G Sparking Plugs regarding a set of type 724 plugs for a modified 20/25 HP engine. | 26th Nov 1935 | Box 162 \ 4 img127 | |
| Letter from K.L.G Sparking Plugs discussing a proposal for an integral screen and a new Cadmium plating for the type 850 plug. | 8th Jan 1936 | Box 162 \ 4 img128 | |
| Letter from K.L.G. Sparking Plugs Limited regarding the supply of sample plugs for trial. | 8th Jan 1936 | Box 162 \ 4 img129 | |
| Letter from K.L.G. Sparking Plugs Limited discussing suitable plug types for a new 25 HP engine. | 9th Jan 1936 | Box 162 \ 4 img130 | |
| Response letter to K.L.G. Sparking Plugs regarding integral screened plugs, plating processes, and trials. | 10th Jan 1936 | Box 162 \ 4 img131 | |
| Letter to K.L.G. Sparking Plugs, Ltd. agreeing to the use of cadmium plating on Bentley sparking plugs. | 14th Jan 1936 | Box 162 \ 4 img132 | |
| Letter from K.L.G. Sparking Plugs confirming agreement to use Cadmium plating on type 850 plugs. | 16th Jan 1936 | Box 162 \ 4 img133 | |
| Faulty KLG-850 spark plugs from Chassis No. B.168-CR which are misfiring. | 25th Feb 1936 | Box 162 \ 4 img134 | |
| Two faulty plugs that were fixed by cleaning and are due for a road test. | 10th Mar 1936 | Box 162 \ 4 img135 | |
| Letter from K.L.G Sparking Plugs Limited regarding the dispatch of various types of plugs. | 10th Mar 1936 | Box 162 \ 4 img136 | |
| Letter from K.L.G. Sparking Plugs regarding the supply and specification of plugs for a 4.5-litre engine. | 11th Mar 1936 | Box 162 \ 4 img137 | |
| Letter from K.L.G. Sparking Plugs Limited discussing the specifications and supply of various spark plug models. | 11th Mar 1936 | Box 162 \ 4 img138 | |
| Letter from KLG Sparking Plugs Limited regarding suitable spark plugs for a 25 HP production engine. | 24th Mar 1936 | Box 162 \ 4 img139 | |
| Invoice and payment for K.L.G. sparking plugs. | 27th Mar 1936 | Box 162 \ 4 img140 | |
| Letter from K.L.G Sparking Plugs Limited regarding a set of plugs for an Alvis 'Silver Eagle' engine. | 29th Apr 1936 | Box 162 \ 4 img141 | |
| Follow-up memo regarding an outstanding invoice for two lots of sparking plugs from K.L.G. Sparking Plugs Ltd. | 7th May 1936 | Box 162 \ 4 img142 | |
| Ordering and returning of various types of sparking plugs. | 1st May 1936 | Box 162 \ 4 img143 | |
| The return of various types of sparking plugs to K.L.G. Co. | 8th May 1936 | Box 162 \ 4 img144 | |
| Letter from KLG Sparking Plugs Limited regarding an order and credit arrangement for racing spark plugs for Mr. E.R. Hall. | 12th May 1936 | Box 162 \ 4 img145 | |
| Internal request to order K.L.G. sparking plugs for a Phantom III Chassis. | 27th May 1936 | Box 162 \ 4 img146 | |
| Letter to K.L.G. Sparking Plugs Ltd. requesting testing and modification of plugs for the Phantom III Chassis. | 27th May 1936 | Box 162 \ 4 img147 | |
| Letter from K.L.G. Sparking Plugs regarding the production and specifications of plugs for the Phantom III and Merlin engines. | 28th May 1936 | Box 162 \ 4 img148 | |
| Letter from K.L.G. Sparking Plugs regarding four sample plugs made from a new Sinterkorund material for testing. | 5th Jun 1936 | Box 162 \ 4 img149 | |
| Letter from K.L.G Sparking Plugs about consolidating two spark plug models into a single new model, 831, for the Rolls Royce '25/30' car. | 4th Jul 1936 | Box 162 \ 4 img150 | |
| Letter to K.L.G. Sparking Plugs Ltd. giving no objection to the alteration of plugs. | 8th Jul 1936 | Box 162 \ 4 img151 | |
| Letter to K.L.G. Sparking Plugs regarding misfiring issues with 850 type plugs after use with leaded fuel. | 9th Jul 1936 | Box 162 \ 4 img152 | |
| Letter from K.L.G Sparking Plugs responding to an issue with type 850 plugs in a Bentley car. | 15th Jul 1936 | Box 162 \ 4 img153 | |
| Dispatch note from K.L.G Sparking Plugs Limited for sparking plugs. | 25th Jul 1936 | Box 162 \ 4 img154 | |
| Dispatch note from K.L.G Sparking Plugs Limited for type 850 triangle spark plugs. | 24th Jul 1936 | Box 162 \ 4 img155 | |
| Letter to K.L.G. Sparking Plugs Ltd. regarding issues with lead deposit on the 850 type plug and suggestions for redesign. | 27th Jul 1936 | Box 162 \ 4 img156 | |
| Letter to The Ethyl Export Corporation regarding misfiring issues with K.L.G. 850 plugs and Ethyl fuel. | 28th Jul 1936 | Box 162 \ 4 img157 | |
| Question regarding lead oxide deposition on spark plug electrodes. | 29th Jul 1936 | Box 162 \ 4 img158 | |
| Letter from Ethyl Export Corporation discussing the technical aspects and problems of sparking plugs. | 29th Jul 1936 | Box 162 \ 4 img159 | |
| Letter discussing spark plug issues, testing methods, critical temperatures, and recommendations for B.G. type plugs. | 6th Aug 1936 | Box 162 \ 4 img160 | |
| Letter to K.L.G. Sparking Plugs Ltd. requesting different, hotter plugs for testing on Bentley and Phantom III chassis. | 6th Aug 1936 | Box 162 \ 4 img161 | |
| Letter to the Ethyl Export Corporation regarding K.L.G. sparking plugs from a Bentley chassis being sent for laboratory examination due to lead deposits and misfiring. | 7th Aug 1936 | Box 162 \ 4 img162 | |
| Request to despatch used and new K.L.G. type 850 sparking plugs to The Ethyl Export Corporation for laboratory examination. | 7th Aug 1936 | Box 162 \ 4 img163 | |
| Letter from K.L.G. Sparking Plugs Limited regarding the supply of Type 827 plugs. | 12th Aug 1936 | Box 162 \ 4 img164 | |
| Letter from K.L.G Sparking Plugs concerning the supply of type 827 plugs for a Bentley racing engine. | 17th Aug 1936 | Box 162 \ 4 img165 | |
| Experimental department report on the misfiring of a Bentley chassis when using Ethyl fuel. | 7th Sep 1936 | Box 162 \ 4 img166 | |
| Investigation into engine misfiring on Bentley engines using leaded (Ethyl) petrol. | 7th Sep 1936 | Box 162 \ 4 img167 | |
| The insulation resistance of spark plugs at various temperatures, detailing the effects of lead deposits and comparing different plug insulator materials. | 7th Sep 1936 | Box 162 \ 4 img168 | |
| The testing of spark plugs' insulation resistance at various temperatures and with lead deposits. | 7th Sep 1936 | Box 162 \ 4 img169 | |
| Graph showing the heating and cooling performance of a new KLG 850 A plug against temperature. | 7th Sep 1936 | Box 162 \ 4 img170 | |
| Graph of heating and cooling curves for a KLG 850 A plug after a 650-mile test run. | 29th Aug 1936 | Box 162 \ 4 img171 | |
| Blueprint graph showing heating and cooling curves for a KLG 850 A spark plug after a 650-mile run. | 29th Aug 1936 | Box 162 \ 4 img172 | |
| Graph showing the repeated test results for a cleaned KLG 850A plug, plotting an unspecified value against temperature. | 29th Aug 1936 | Box 162 \ 4 img173 | |
| Graph of leakage versus temperature for a K.L.G. V9/1 component with heavy lead deposit, showing heating and cooling curves. | 11th Sep 1936 | Box 162 \ 4 img174 | |
| Internal request to order various plugs and terminals, with handwritten receipt confirmations. | 11th Sep 1936 | Box 162 \ 4 img175 | |
| Letter from K.L.G Sparking Plugs discussing the supply and testing of various spark plugs for the Phantom III. | 11th Sep 1936 | Box 162 \ 4 img176 | |
| Letter from K.L.G. Sparking Plugs regarding an order for type 850 plugs and a potential modification. | 11th Sep 1936 | Box 162 \ 4 img177 | |
| To order K.L.G. sparking plugs for Merlin engines. | 14th Sep 1936 | Box 162 \ 4 img178 | |
| Letter from K.L.G Sparking Plugs Limited chasing a response to a previous letter. | 18th Sep 1936 | Box 162 \ 4 img179 | |
| Request to send six K.L.G. Type 850P sparking plugs for fitting to a Bentley car. | 18th Sep 1936 | Box 162 \ 4 img180 | |
| Confirming the fitting of K.L.G. Type 850P plugs upon arrival. | 19th Sep 1936 | Box 162 \ 4 img181 | |
| The fitting of K.L.G. Type 850P plugs and the use of Discol fuel in car B-61-FC. | 23th Sep 1936 | Box 162 \ 4 img182 | |
| Requesting a covering order for 12 experimental plugs supplied for test on a Bentley chassis. | 24th Sep 1936 | Box 162 \ 4 img183 | |
| Letter to a spark plug manufacturer about a 'triangle' modification and plug trouble on a Bentley. | 24th Sep 1936 | Box 162 \ 4 img184 | |
| Letter to K.L.G. Sparking Plugs Ltd. enquiring about a potential cost reduction for plugs used on Bentley chassis. | 2nd Oct 1936 | Box 162 \ 4 img185 | |
| Letter from K.L.G Sparking Plugs regarding the cost implications of altering a type 850 plug to S.M.M. & T. standards. | 3rd Oct 1936 | Box 162 \ 4 img186 | |
| Letter from K.L.G. Sparking Plugs regarding an experimental alteration to a type R.868 plug. | 16th Oct 1936 | Box 162 \ 4 img187 | |
| Notice regarding incorrect spark plug gaps and missing lock washers on K.L.G. 831 sparking plugs for the 25/30 HP chassis. | 22th Oct 1936 | Box 162 \ 4 img188 | |
| Car misfiring and the dispatch of new K.L.G. plugs for replacement. | 18th Nov 1936 | Box 162 \ 4 img189 | |
| Request to place an official order for 12 K.L.G. sparking plugs. | 5th Nov 1936 | Box 162 \ 4 img190 | |
| Sending a new set of K.L.G. plugs to fix a car's misfiring issue. | 18th Nov 1936 | Box 162 \ 4 img191 | |
| Letter to K.L.G. Sparking Plugs Ltd. regarding complaints about faulty plugs on Bentley chassis in France. | 16th Nov 1936 | Box 162 \ 4 img192 | |
| Issues with faulty K.L.G. type 850 sparking plugs. | 18th Nov 1936 | Box 162 \ 4 img193 | |
| Letter from K.L.G. Sparking Plugs regarding the revival of production for the long-obsolete 765.A plug. | 19th Nov 1936 | Box 162 \ 4 img194 | |
| The return of incorrectly sized K.L.G. spark plugs for car GLG 5. | 19th Nov 1936 | Box 162 \ 4 img195 | |
| Letter to K.L.G. Sparking Plug Ltd. regarding issues with Mica plugs and the proposal to test Ceramic plugs. | 19th Nov 1936 | Box 162 \ 4 img196 | |
| Cover memo forwarding a copy of a report received from G.W. Hancock. | 23th Nov 1936 | Box 162 \ 4 img197 | |
| Spark plug issues on a 30 HP car, detailing a fix and requesting different plugs. | 18th Nov 1936 | Box 162 \ 4 img198 | |
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