| Description | Date | Identifier | |
| Supply and testing of Lodge sparking plugs on car 2.B.IV. | 12th Feb 1935 | Box 162 \ 6 img280 | |
| Sample screened sparking plug for Tank engines. | 26th Mar 1935 | Box 162 \ 6 img281 | |
| Order for 'Spectre' sparking plugs. | 15th May 1935 | Box 162 \ 6 img282 | |
| Invoice from Lodge Plugs Limited for the supply of various models of spark plugs, free of charge. | 15th Jul 1938 | Box 162 \ 6 img283 | |
| Order for 48 Lodge type R.R.14 Spectre sparking plugs. | 15th May 1935 | Box 162 \ 6 img284 | |
| Letter to K.L.G. Sparking Plugs regarding Bentley sparking plug failures and modifications. | 16th May 1935 | Box 162 \ 6 img285 | |
| Request to have 24 Lodge RL14 plugs fitted to the new engine for Spectre 3. | 29th May 1935 | Box 162 \ 6 img286 | |
| Letter from Lodge Plugs Limited regarding the testing of spark plugs for a 3 1/2 litre Bentley car. | 21th Jun 1935 | Box 162 \ 6 img287 | |
| Letter to Lodge Plugs Ltd. regarding the testing of experimental X434/2 sparking plugs for a Bentley chassis. | 24th Jun 1935 | Box 162 \ 6 img288 | |
| Internal request to order three types of Lodge sparking plugs for specific orders and the Spectre chassis. | 24th Jun 1935 | Box 162 \ 6 img289 | |
| Letter from Lodge Plugs Limited regarding mislaid spark plugs following W. O. Bentley's accident and sending replacements for testing. | 25th Jun 1935 | Box 162 \ 6 img290 | |
| Dispatch of 6 Lodge X434/2 plugs for chassis 4.B.IV. | 26th Jun 1935 | Box 162 \ 6 img291 | |
| Letter regarding the dispatch and performance testing of Lodge X434/2 plugs for a Bentley. | 26th Jun 1935 | Box 162 \ 6 img292 | |
| Letter from Lodge Plugs Limited regarding the supply of modified X402B/2 plugs for a Kestrel VI engine test. | 12th Jul 1935 | Box 162 \ 6 img293 | |
| Letter from Lodge Plugs Limited regarding the replacement of a defective X434/2 plug. | 8th Aug 1935 | Box 162 \ 6 img294 | |
| Letter from Lodge Plugs Limited concerning the supply of three A5B plugs for testing. | 13th Aug 1935 | Box 162 \ 6 img295 | |
| Letter from Lodge Plugs Limited regarding samples of a tubular terminal. | 20th Aug 1935 | Box 162 \ 6 img296 | |
| Confirmation of sending twelve Lodge type X.434 Sparking Plugs for extended testing in a Bentley Chassis. | 3rd Oct 1935 | Box 162 \ 6 img297 | |
| Proposed modifications to the cylinder head insert to accommodate improved Lodge sparking plugs for the Phantom III. | 16th Oct 1935 | Box 162 \ 6 img298 | |
| Modification of Phantom III sparking plugs, increasing the screwed portion length. | 7th Nov 1935 | Box 162 \ 6 img299 | |
| Internal memorandum requesting an order for 48 Lodge type X465D/1 sparking plugs. | 7th Nov 1935 | Box 162 \ 6 img300 | |
| Letter to Lodge Plugs Ltd. regarding a modification to the Phantom III sparking plug insert. | 12th Nov 1935 | Box 162 \ 6 img301 | |
| Request to despatch six Lodge X465 D/1 sparking plug centres to Mr. B. Hopps of Lodge Plugs, Ltd. for examination. | 13th Nov 1935 | Box 162 \ 6 img302 | |
| Letter from Lodge Plugs Limited regarding sparking plug insert modifications for the Phantom III engine. | 16th Nov 1935 | Box 162 \ 6 img303 | |
| Letter from Lodge Plugs Limited regarding a dozen special plugs, X513's, sent for testing on a 25 HP car. | 2nd Dec 1935 | Box 162 \ 6 img304 | |
| Letter from Lodge Plugs regarding the despatch of A5B plugs for testing on the Kestrel VI engine. | 2nd Dec 1935 | Box 162 \ 6 img305 | |
| Returning 12 Lodge type A14D/1 plugs to the manufacturer. | 3rd Dec 1935 | Box 162 \ 6 img306 | |
| Letter from Lodge Plugs Limited concerning the development of a new spark plug, designated X512, for a 3½ litre Bentley. | 16th Dec 1935 | Box 162 \ 6 img307 | |
| Letter to Messrs. Lodge Plugs, Ltd. regarding the failure of Lodge type A5B and Bentley sparking plugs during testing. | 7th Jan 1936 | Box 162 \ 6 img308 | |
| Letter from Lodge Plugs Limited regarding a sample 14mm long reach plug (CB14) for the 25 HP engine and alternatives. | 30th Jan 1936 | Box 162 \ 6 img309 | |
| Letter from Lodge Plugs Limited regarding the design and testing of 14 mm spark plugs for a 20/25 HP car. | 9th Apr 1936 | Box 162 \ 6 img310 | |
| Letter to Lodge Plugs Ltd. regarding the unsuitability of CB.14 plugs for the 20/25 engine due to incorrect dimensions. | 16th Apr 1936 | Box 162 \ 6 img311 | |
| Letter to Lodge Plugs Ltd. requesting a modification to the RL.14 plug to improve slow running. | 23th Apr 1936 | Box 162 \ 6 img312 | |
| Letter from Lodge Plugs Limited sending X523 plugs for testing on a 20/25 HP car. | 23th Apr 1936 | Box 162 \ 6 img313 | |
| Letter from Lodge Plugs Limited concerning tests on the X512 plug specially designed for a Bentley engine. | 24th Apr 1936 | Box 162 \ 6 img314 | |
| Letter from Lodge Plugs Ltd. regarding the testing and modification of spark plugs for a 30 HP engine. | 24th Apr 1936 | Box 162 \ 6 img315 | |
| Order for 6 dozen Lodge type X523 sparking plugs for a Phantom III. | 27th Apr 1936 | Box 162 \ 6 img316 | |
| Letter to Lodge Plugs Ltd. regarding the testing and ordering of X523 sparking plugs. | 27th Apr 1936 | Box 162 \ 6 img317 | |
| Testing a new Lodge X.523 sparking plug and suggesting alterations for the 25/30 HP model. | 30th Apr 1936 | Box 162 \ 6 img318 | |
| Letter to Lodge Plugs Ltd. regarding the rejection of RL.14 sparking plugs for the 20/25 HP car. | 8th Apr 1936 | Box 162 \ 6 img319 | |
| Order for 48 Lodge sparking plugs. | 10th Jun 1936 | Box 162 \ 6 img320 | |
| Letter from Lodge Plugs Limited chasing a reply on the testing of spark plugs for Bentley engines. | 25th Jun 1936 | Box 162 \ 6 img321 | |
| Letter from Lodge Plugs Limited following up on a telephone request for two dozen X525 plugs for a new 30 HP engine. | 25th Jun 1936 | Box 162 \ 6 img322 | |
| Letter to Lodge Plugs Ltd. regarding the testing of various spark plug types. | 26th Jun 1936 | Box 162 \ 6 img323 | |
| Letter discussing the poor performance of Lodge sparking plugs during engine tests on the Merlin engine. | 27th Jun 1936 | Box 162 \ 6 img324 | |
| Letter from Lodge Plugs Limited discussing Bentley, 25/30 HP engine, and Aluminium Oxide insulated sparking plugs. | 27th Jun 1936 | Box 162 \ 6 img325 | |
| Letter from Lodge Plugs Ltd. regarding Merlin Engine sparking plugs, discussing the X465 S/3 model. | 27th Jun 1936 | Box 162 \ 6 img326 | |
| Letter to Lodge Plugs Ltd. concerning the modification and testing of Bentley and Merlin sparking plugs. | 2nd Jul 1936 | Box 162 \ 6 img327 | |
| Letter from Lodge Plugs Limited regarding the development and supply of sparking plugs for Bentley and Merlin engines. | 7th Jul 1936 | Box 162 \ 6 img328 | |
| Letter from Lodge Plugs Ltd. regarding a 14mm BR spark plug and its comparison to a competitor's product. | 30th Jul 1936 | Box 162 \ 6 img329 | |
| To order Lodge X546 sparking plugs for the Phantom III. | 18th Sep 1936 | Box 162 \ 6 img330 | |
| Letter from Lodge Plugs Limited following up on the testing of plugs sent for a Bentley engine. | 12th Oct 1936 | Box 162 \ 6 img331 | |
| Recommending a 6-week supply notice for Lodge sparking plugs on the Phantom III chassis. | 28th Oct 1936 | Box 162 \ 6 img332 | |
| Requesting an order for modified Lodge RL.14 plugs. | 22th Oct 1936 | Box 162 \ 6 img333 | |
| Letter from Lodge Plugs Limited regarding a quotation for spring loaded terminal nuts and tubing. | 15th Dec 1936 | Box 162 \ 6 img334 | |
| Letter to Lodge Plugs Limited regarding the manufacturing possibility of a T.A.24 nut. | 18th Dec 1936 | Box 162 \ 6 img335 | |
| Letter from Lodge Plugs Limited requesting sample harness fittings and a plug for the new Merlin engine. | 1st Jan 1937 | Box 162 \ 6 img336 | |
| Letter to Lodge Plugs Ltd. declining a request to send K.L.G. parts, offering on-site visual inspection instead. | 4th Jan 1937 | Box 162 \ 6 img337 | |
| Letter from Lodge Plugs Limited regarding the testing of various spark plugs for the Merlin 'G' engine. | 18th Feb 1937 | Box 162 \ 6 img338 | |
| Letter to Lodge Plugs Ltd. confirming the retention of the standard R.A.14/1 sparking plug. | 20th Feb 1937 | Box 162 \ 6 img339 | |
| Letter from Lodge Plugs Limited regarding the retention of the standard 14mm plug for the Merlin 'G' engine and offering other plug types for testing. | 23th Feb 1937 | Box 162 \ 6 img340 | |
| Correcting a previous statement regarding spark plug terminal clearances and outlining continued testing plans. | 20th Apr 1937 | Box 162 \ 6 img341 | |
| Request to place an order for two types of plugs with Lodge Plugs Ltd. to be held as experimental stock. | 22th Apr 1937 | Box 162 \ 6 img342 | |
| Letter from Lodge Plugs Limited concerning the supply and development of various spark plugs. | 23th Apr 1937 | Box 162 \ 6 img343 | |
| Performance and suitability of Lodge Sintox 640 and 641 sparking plugs for 25/30 and Bentley engines. | 11th May 1938 | Box 162 \ 6 img344 | |
| Customer trouble with K.L.G. Corundite Plugs and requesting a report on Lodge's plugs. | 29th Apr 1938 | Box 162 \ 6 img345 | |
| Letter from K.L.G. Sparking Plugs Ltd. regarding point erosion on 'Corundite' plugs and proposed solutions. | 22th Apr 1938 | Box 162 \ 6 img346 | |
| Letter from Lodge Plugs Limited concerning the supply of specially finished sparking plugs for the 1938 Motor Exhibition. | 24th Aug 1938 | Box 162 \ 6 img347 | |
| Invoice from Lodge Plugs Limited for a free of charge supply of spark plugs. | 15th Jul 1938 | Box 162 \ 6 img348 | |
| Letter from Lodge Plugs Limited regarding sending Sintox plugs for testing. | 15th Jul 1938 | Box 162 \ 6 img349 | |
| Letter from Lodge Plugs Ltd. to Bentley Motors offering free specially finished sparking plugs for the 1938 Motor Exhibition. | 25th Aug 1938 | Box 162 \ 6 img350 | |
| Letter to Lodge Plug Ltd. regarding cylinder head modifications affecting plug barrel length. | 28th Feb 1939 | Box 162 \ 6 img351 | |
| Letter from Lodge Plugs Limited regarding a cylinder head modification and providing test plugs. | 2nd Mar 1939 | Box 162 \ 6 img352 | |
| Packing slip from Lodge Plugs Limited for a single CB14 sparking plug for inspection. | 1st Apr 1939 | Box 162 \ 6 img353 | |
| The return of a trial sparking plug from The Lodge Plugs Ltd. | 22th Apr 1939 | Box 162 \ 6 img354 | |
| Letter to Lodge Plugs Ltd. regarding the permissible length of a sample GB.14 spark plug barrel for a Wraith engine. | 22th Apr 1939 | Box 162 \ 6 img355 | |
| Letter to Lodge Sparking Plugs Ltd. about misfiring and bad starting due to poor quality petrol, requesting a hotter running plug. | 24th Feb 1940 | Box 162 \ 6 img356 | |
| Letter from Lodge Plugs Limited regarding trouble with sparking plugs using pool petrol and supplying alternative plugs for testing. | 1st Mar 1940 | Box 162 \ 6 img357 | |
| Letter to Lodge Plugs Ltd. regarding the testing of 741 plugs. | 6th Mar 1940 | Box 162 \ 6 img358 | |
| Letter to Lodge Plugs Ltd. concerning the testing of 741 plugs. | 6th Mar 1940 | Box 162 \ 6 img359 | |
| Request to issue a covering order for six 741 Type Sparking Plugs from Lodge Plugs Ltd. | 11th May 1940 | Box 162 \ 6 img360 | |
| Letter from Lodge Plugs Limited discussing spark plug thread sizes, materials, and suitability for different aircraft engines. | 7th Jun 1940 | Box 162 \ 6 img361 | |
| Letter from the Managing Director, Bernard Hopps, requesting to be kept advised of any information regarding spark plug development. | 7th Jun 1940 | Box 162 \ 6 img362 | |
| Blank or unreadable page. | 22th Jul 1943 | Box 162 \ 6 img363 | |
| Letter to Lodge Plugs Ltd. regarding the dispatch and further testing of sparking plugs for the Meteor engine. | 22th Jul 1943 | Box 162 \ 6 img364 | |
| Letter to Lodge Plugs Ltd. clarifying details about 14mm spark plugs and suggesting modifications for improved performance. | 26th Apr 1932 | Box 162 \ 6 img365 | |
| The endurance tests of S.U. electric petrol pumps. | 3rd Aug 1933 | Box 163 \ 1 img001 | |
| Test data and circuit diagrams for an electrical component. | 7th Jul 1931 | Box 163 \ 1 img002 | |
| Tests conducted on S.U. Electric Petrol Pumps to investigate a reported delivery fault. | 11th Sep 1933 | Box 163 \ 1 img003 | |
| The current draw of pumps and the potential for redesigning the pump winding for lower consumption. | 11th Sep 1933 | Box 163 \ 1 img004 | |
| Protecting the ignition system by independently fusing electric petrol pumps. | 12th Sep 1933 | Box 163 \ 1 img005 | |
| Incorporation of a fuse into S.U. electric petrol pumps and the associated fire risk. | 12th Sep 1933 | Box 163 \ 1 img006 | |
| Description of the S.U. Electric Pressure Type Pump and its operation. | 12th Sep 1933 | Box 163 \ 1 img007 | |
| Description of the operation of a pump's contact breaker, rods, and rocker gear, noting its durability. | 12th Sep 1933 | Box 163 \ 1 img008 | |
| Instructions for mounting the S.U. Electrical Fuel Pump, Pressure Type. | 18th Sep 1933 | Box 163 \ 1 img009 | |
| Technical details on S.U. Electric Petrol Pumps, including power absorption, winding particulars, and temperature effects. | 18th Sep 1933 | Box 163 \ 1 img010 | |
| Graph plotting delivery versus temperature for two S.U. electric petrol pumps operating in parallel, comparing petrol and paraffin. | 13th Mar 1938 | Box 163 \ 1 img011 | |
| Graph and data table showing the standstill current versus temperature for an S.U. electric petrol pump at a constant 12 volts. | 10th Apr 1933 | Box 163 \ 1 img012 | |
| Graph of delivery versus temperature curves for two S.U. electric petrol pumps working in parallel, comparing petrol and paraffin. | 29th Sep 1938 | Box 163 \ 1 img013 | |
| Tests to determine the fuse value for an S.U. Electric Petrol Pump. | 19th Sep 1933 | Box 163 \ 1 img014 | |
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