| Description | Date | Identifier | |
| Listing produced parts, including a washer, nut, and distributor housing, and requesting instructions for one set. | 19th Jul 1939 | Box 167 \ 2 img221 | |
| Letter to Marconi-Ekco Instruments Ltd. requesting a missing mains lead for a loaned Universal Impedance Bridge unit. | 21th Jul 1939 | Box 167 \ 2 img222 | |
| Confirming receipt of a loaned Marconi-Ekco universal Impedance Bridge unit for inspection. | 21th Jul 1939 | Box 167 \ 2 img223 | |
| Order for a solid fluted rubber mat for the Chassis Experimental Laboratory. | 27th Jul 1939 | Box 167 \ 2 img224 | |
| Letter to Marconi-Ekco Instruments Ltd. regarding the return of a 'Bridge' for testing. | 8th Aug 1939 | Box 167 \ 2 img225 | |
| Telegram urgently requesting the return of an impedance bridge from the experimental department. | 8th Aug 1939 | Box 167 \ 2 img226 | |
| Requesting the return of a loaned Impedance Bridge to Marconi Instruments Ltd. | 9th Aug 1939 | Box 167 \ 2 img227 | |
| Confirmation of the despatch and return of an Impedance Bridge to Marconi Instruments Ltd. | 9th Aug 1939 | Box 167 \ 2 img228 | |
| Request to order three replacement Dagenite accumulators for a H.T. Peak Voltmeter. | 11th Aug 1939 | Box 167 \ 2 img229 | |
| From the Electrical Laboratory requesting the repair of a Benson Stop Watch. | 26th Jun 1941 | Box 167 \ 2 img230 | |
| Wiring diagram for a sodium testing machine. | 13th Aug 1941 | Box 167 \ 2 img231 | |
| Order to despatch a stopwatch for overhaul and repair to Messrs. Watkin's Ltd. | 13th Aug 1941 | Box 167 \ 2 img232 | |
| Order for distilled water and Osram lamps for the chassis electrical laboratory. | 14th Sep 1939 | Box 167 \ 2 img233 | |
| Requesting the purchase of a hydrometer and spare floats for the laboratory from an alternative supplier. | 1st Dec 1939 | Box 167 \ 2 img234 | |
| Order for head lamp bulbs from Edison Swan Electrical Co. Ltd. | 12th Dec 1939 | Box 167 \ 2 img235 | |
| Request to obtain full details on the model 3339 Oscillograph and cathode ray tubes from AC. Cossor Ltd. | 21th Dec 1939 | Box 167 \ 2 img236 | |
| Request to obtain 6 yards of 5 cored cable from Ripaults Ltd. | 2nd Jan 1940 | Box 167 \ 2 img237 | |
| Letter from A.C. Cossor Ltd providing details on Cathode Ray Tubes and an Oscillograph. | 2nd Jan 1940 | Box 167 \ 2 img238 | |
| Request to obtain 6 yards of 5-cored cable from Ripaults Ltd. | 2nd Jan 1940 | Box 167 \ 2 img239 | |
| Letter from Howells (Electric Motors) Ltd providing a price quote for A.C. motors. | 9th Jan 1940 | Box 167 \ 2 img240 | |
| Advertisement for a Squirrel Cage Protected Type A.C. Motor by Howells (Electric Motors) Ltd. | 24th Jan 1940 | Box 167 \ 2 img241 | |
| Inquiry to A.C. Cossor Ltd. requesting a demonstration of a Cathode Ray Oscillograph for ignition coil testing. | 24th Jan 1940 | Box 167 \ 2 img242 | |
| Letter from A.C. Cossor Ltd. arranging a demonstration of a Model 3339 Double Beam Oscillograph. | 29th Jan 1940 | Box 167 \ 2 img243 | |
| Letter to A.C. Cossor Ltd. arranging a demonstration of a model 3339 Double Beam Oscillograph. | 2nd Feb 1940 | Box 167 \ 2 img244 | |
| Letter from A.C. Cossor Ltd arranging the dispatch and demonstration of a model 3339 Double Beam Oscillograph. | 3rd Feb 1940 | Box 167 \ 2 img245 | |
| Request to obtain two bobbins of bare (oxidised if possible) Glowray wire. | 12th Feb 1940 | Box 167 \ 2 img246 | |
| Letter from A.C. Cossor Ltd. confirming a demonstration and providing details on oscillograph equipment. | 12th Feb 1940 | Box 167 \ 2 img247 | |
| Page two of a letter from A.C. Cossor Ltd. regarding the use of Oscillograph amplifiers. | 12th Feb 1940 | Box 167 \ 2 img248 | |
| Leaflet for the Cossor-Dodds Pressure Unit Model 3361, an auxiliary apparatus for pressure recording. | 12th Feb 1940 | Box 167 \ 2 img249 | |
| Sales and technical specification sheet for Cossor Instruments' Model 3353 Maximum Pressure Valve and Model 3350 Contact Breaker. | 12th Feb 1940 | Box 167 \ 2 img250 | |
| Leaflet for the Cossor-Dodds Amplifier Model 3352. | 12th Feb 1940 | Box 167 \ 2 img251 | |
| Circuit diagram and specification sheet for the Cossor-Dodds Amplifier Model 3352. | 14th Feb 1940 | Box 167 \ 2 img252 | |
| Requesting the repair of a stopwatch from the Chassis Electrical Laboratory. | 14th Feb 1940 | Box 167 \ 2 img253 | |
| Request to obtain special impregnated felt washers claimed to prevent battery terminal corrosion. | 14th Feb 1940 | Box 167 \ 2 img254 | |
| Requesting the return of loaned demonstration apparatus to A.C. Cossor Ltd. | 14th Feb 1940 | Box 167 \ 2 img255 | |
| Request to purchase a Cossor Cathode Ray Oscillograph and Piezo crystal pick-up for noise analysis projects. | 15th Feb 1940 | Box 167 \ 2 img256 | |
| Dispatch note requesting the repair of a stopwatch from the Chassis Electrical Laboratory. | 16th Feb 1940 | Box 167 \ 2 img257 | |
| The return of loaned demonstration apparatus to A.C. Cossor Ltd. | 16th Feb 1940 | Box 167 \ 2 img258 | |
| Short message confirming the dispatch of an oscillograph and pick-ups from Derby. | 17th Feb 1940 | Box 167 \ 2 img259 | |
| The purchase agreement for a Cossor Cathode Ray Oscillograph. | 20th Feb 1940 | Box 167 \ 2 img260 | |
| Request for the purchase of a Cossor Cathode Ray Oscillograph and a Piezo crystal pick-up. | 15th Feb 1940 | Box 167 \ 2 img261 | |
| The agreement to purchase a Cossor Cathode Ray Oscillograph. | 20th Feb 1940 | Box 167 \ 2 img262 | |
| Letter from A.C. Cossor Ltd. complaining about the late return of a Model 3339 Oscillograph. | 21th Feb 1940 | Box 167 \ 2 img263 | |
| Letter to A.C. Cossor Ltd. confirming the purchase of a model 3339 Cathode Ray apparatus and a Rothermel brush vibration 'Pick-up'. | 21th Feb 1940 | Box 167 \ 2 img264 | |
| Internal request to obtain an Oscillograph and a Vibration 'Pick-up' for the chassis experimental laboratory. | 21th Feb 1940 | Box 167 \ 2 img265 | |
| Letter to A.C. Cossor Ltd. regarding a dispute over the time an instrument was held for testing. | 24th Feb 1940 | Box 167 \ 2 img266 | |
| Letter from A.C. Cossor Ltd. acknowledging an order for an oscillograph and vibration pick-up, and advising on delivery. | 26th Feb 1940 | Box 167 \ 2 img267 | |
| Letter from A.C. Cossor Ltd. to Rolls-Royce regarding a demonstrated instrument and clarifying a communication about an order. | 28th Feb 1940 | Box 167 \ 2 img268 | |
| Requesting the preparation of an order for a Radio Analyser. | 7th Mar 1940 | Box 167 \ 2 img269 | |
| Request to obtain a portable radio analyser, Model E.665, from Western Electric Instrument Co. Ltd. | 12th Mar 1940 | Box 167 \ 2 img270 | |
| Request to obtain a Model E.665 portable radio analyser from Western Electric Instrument Co.Ltd. | 12th Mar 1940 | Box 167 \ 2 img271 | |
| Purchase of an oscillograph and a vibration pick-up from A. C. Cossor Ltd. | 12th Mar 1940 | Box 167 \ 2 img272 | |
| Request to order a Model E.665 Radio Analyser from Sangamo Weston Ltd for the laboratory. | 29th Mar 1940 | Box 167 \ 2 img273 | |
| Request to obtain a specific Ferogrip belt from Messrs. Ferodo Ltd. for a dynamo test rig. | 30th Mar 1940 | Box 167 \ 2 img274 | |
| Request to obtain six replacement stainless steel balls for a badly pitted H.T. Voltmeter. | 5th Apr 1940 | Box 167 \ 2 img275 | |
| Request to manufacture a test rig for conventional 8 distributors, referencing specific arrangement drawings. | 6th Apr 1940 | Box 167 \ 2 img276 | |
| Internal order request for stainless steel balls for the Chassis Experimental Laboratory. | 9th Apr 1940 | Box 167 \ 2 img277 | |
| Request to obtain details on a range of Meggers from Evershed and Vignoles Ltd for laboratory equipment. | 17th Apr 1940 | Box 167 \ 2 img278 | |
| Request for details on Meggers from Evershed & Vignoles, specifically a 2,500 voltage model. | 17th Apr 1940 | Box 167 \ 2 img279 | |
| Requesting to continue the manufacture of a test rig for conventional 8 distributors. | 9th Apr 1940 | Box 167 \ 2 img280 | |
| Letter from Marconi-Ekco Instruments Ltd. announcing a change of address for their Sales and Administration Offices. | 1st May 1940 | Box 167 \ 2 img281 | |
| Advice note from Sangamo Weston Ltd. for the despatch of two cylinder temperature indicators. | 11th Jul 1940 | Box 167 \ 2 img282 | |
| Internal order for the creation of a test rig for conventional distributors, referencing specific arrangement drawings. | 16th Jun 1939 | Box 167 \ 2 img283 | |
| Requesting the transfer and installation of Chassis Electrical Laboratory equipment to the Clan Foundry. | 5th Jul 1940 | Box 167 \ 2 img284 | |
| Requesting the installation of a small radiator in an office at the Clan Foundry. | 17th Jul 1940 | Box 167 \ 2 img285 | |
| The purchase of a carboy of distilled water for car battery maintenance. | 23th Jul 1940 | Box 167 \ 2 img286 | |
| Delivery note for one carboy of distilled water to the Clan Foundry, Belper. | 27th Jul 1940 | Box 167 \ 2 img287 | |
| Equipment estimate for the removal of the Chassis Experimental Laboratory to the Clan Foundry, Belper. | 30th Jul 1940 | Box 167 \ 2 img288 | |
| Letter to A. Hulme & Son.Ltd. requesting the supply of accumulators. | 12th Aug 1940 | Box 167 \ 2 img289 | |
| Receipt note from E. & A. West, Ltd. for the delivery of distilled water to the Clan Foundry in Belper. | 9th Jan 1941 | Box 167 \ 2 img290 | |
| Fitting of an adjustable lamp in an office at the Clan Foundry. | 14th May 1941 | Box 167 \ 2 img291 | |
| Internal order for a Sparking Plug Test Rig for the Clan Foundry. | 14th Aug 1941 | Box 167 \ 2 img292 | |
| Letter from A.T. Speedometer Co. Ltd. regarding the supply and calibration of instruments for test beds. | 8th Nov 1941 | Box 167 \ 2 img293 | |
| Order for one carboy of distilled water from A. E. West & Co., Derby, for battery maintenance at the Clan Foundry. | 14th Nov 1941 | Box 167 \ 2 img294 | |
| Order of one carboy of sulphuric acid for accumulator maintenance. | 11th Dec 1941 | Box 167 \ 2 img295 | |
| Internal request to obtain two thermometers for measuring accumulator temperatures from a supplier. | 17th Dec 1941 | Box 167 \ 2 img296 | |
| The procurement of Constantan wire for instrument calibration. | 17th Dec 1941 | Box 167 \ 2 img297 | |
| Requesting the repair of a laboratory stopwatch. | 7th Jan 1944 | Box 167 \ 2 img298 | |
| Order of one carboy of distilled water for battery maintenance. | 25th Feb 1942 | Box 167 \ 2 img299 | |
| Letter from a cable supplier discussing a puckering effect found on a sample of H.T. Ignition Cable. | 30th Oct 1936 | Box 167 \ 3 img001 | |
| Letter from The General Electric Co. Ltd. inviting Rolls Royce's Chief Engineer to visit their Moulded Insulation Shops. | 4th Nov 1936 | Box 167 \ 3 img002 | |
| Letter to The General Electric Co. Ltd. postponing a visit to their Moulded Insulation shops. | 6th Nov 1936 | Box 167 \ 3 img003 | |
| Letter from The General Electric Co. Ltd. confirming a meeting and travel arrangements. | 11th Nov 1936 | Box 167 \ 3 img004 | |
| Letter to The General Electric Co. Ltd. arranging a meeting and pickup at New St. Station. | 12th Nov 1936 | Box 167 \ 3 img005 | |
| Letter to Mr. Kaula of General Electric Co. regarding a works visit and awaiting quotations. | 18th Nov 1936 | Box 167 \ 3 img006 | |
| Letter from the Experimental Department arranging a visit to Ebonestos Insulators Ltd. to discuss Bakelite Mouldings. | 18th Nov 1936 | Box 167 \ 3 img007 | |
| Internal request to order special black insulating compound from British Insulated Cables Ltd. | 3rd Dec 1936 | Box 167 \ 3 img008 | |
| Letter from Hadfields (Merton) Limited regarding the despatch of varnish and compound samples. | 1st Jan 1937 | Box 167 \ 3 img009 | |
| Faulty sample of Helsby cables which has been taken up with the makers. | 1st Feb 1937 | Box 167 \ 3 img010 | |
| The most economical method of producing ferrules for ignition wires. | 3rd Feb 1937 | Box 167 \ 3 img011 | |
| Inquiry to Messrs Hadfields Ltd. about the suitability of their varnish for impregnating enamelled copper wire windings. | 9th Feb 1937 | Box 167 \ 3 img012 | |
| Defective Helsby Cable removed from chassis GXM-79 after 1,998 miles. | 11th Feb 1937 | Box 167 \ 3 img013 | |
| Letter to a supplier, British Insulated Cables Ltd, regarding the failure of an ignition cable. | 13th Feb 1937 | Box 167 \ 3 img014 | |
| Letter from British Insulated Cables Ltd. regarding a failure of their latest Ignition Cable on a Phantom III chassis. | 15th Feb 1937 | Box 167 \ 3 img015 | |
| The failure of a Helsby H.T. coil feed wire from chassis 121-RY. | 10th Mar 1937 | Box 167 \ 3 img016 | |
| Letter to British Insulated Cables Ltd. regarding failing high tension cables on a P.3. chassis. | 11th Mar 1937 | Box 167 \ 3 img017 | |
| Letter from British Insulated Cables Ltd. regarding trouble with high tension cables on a P.3 chassis. | 12th Mar 1937 | Box 167 \ 3 img018 | |
| Letter to British Helsby Insulated Cables Ltd. regarding failures of their standard cable and a request for new ozone-proof alternatives. | 12th Mar 1937 | Box 167 \ 3 img019 | |
| Letter from supplier E. Kalker & Co. confirming their high tension ignition cables are of British manufacture. | 26th Mar 1937 | Box 167 \ 3 img020 | |
| Letter to E. Kalker & Co. Ltd. requesting clarification on the manufacturing origin of H.T. cables. | 31th Mar 1937 | Box 167 \ 3 img021 | |
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