| Description | Date | Identifier | |
| Performance graph for the Harrison 'Twinflow' Car Heater - Duplex Model. | 5th Dec 1936 | Box 137 \ 1 scan0201 | |
| Graph showing the effect of water flow on a Harrison Twinflow duplex model car heater. | 5th Dec 1936 | Box 137 \ 1 scan0202 | |
| Performance graph and specifications for the Hadees Car Heater, Model H.30. | 5th Dec 1936 | Box 137 \ 1 scan0203 | |
| Performance chart for the Hadees Car Heater Model H.30, showing the effect of water flow. | 5th Feb 1936 | Box 137 \ 1 scan0204 | |
| Performance graph and specifications for a Tropic-Aire Duplex Model car heater. | 3rd Dec 1936 | Box 137 \ 1 scan0205 | |
| Performance chart showing the effect of water flow on a Tropic-Aire Duplex Model car heater. | 3rd Dec 1936 | Box 137 \ 1 scan0206 | |
| Letter from Clayton Dewandre Co. Ltd. regarding the testing of a smaller Tropic-aire heater. | 7th Dec 1936 | Box 137 \ 1 scan0207 | |
| Letter to Clayton Dewandre Co. Ltd. regarding car heater test data, requesting the return of heaters and a quotation. | 8th Dec 1936 | Box 137 \ 1 scan0208 | |
| Returns advice note from Clayton Dewandre Co. Ltd. for car heaters returned after testing. | 9th Dec 1936 | Box 137 \ 1 scan0209 | |
| Letter to S. Guiterman Co. Ltd. cancelling an order for a Duplex model car heater and ordering a Universal model. | 8th Dec 1936 | Box 137 \ 1 scan0210 | |
| Letter from Clayton Dewandre Co. Ltd. concerning the supply, data, and pricing of an 'S.2' Car heater. | 9th Dec 1936 | Box 137 \ 1 scan0211 | |
| Specification sheet comparing Clayton Car Heaters models S.2.CA. and C.C. | 15th Dec 1936 | Box 137 \ 1 scan0212 | |
| Specification and performance details for a Clayton S.2.RA. car heater. | 15th Dec 1936 | Box 137 \ 1 scan0213 | |
| Graph showing the performance of a CC Type Car Heater, testing the effect of varying the fan blade angle. | 15th Dec 1936 | Box 137 \ 1 scan0214 | |
| Graph showing pressure drop versus water flow for a 'CC' type car heater. | 16th Dec 1936 | Box 137 \ 1 scan0215 | |
| Chart showing dissipation and water pressure drop for a Clayton S.2 car heater. | 16th Dec 1936 | Box 137 \ 1 scan0216 | |
| Performance chart showing dissipation and water pressure drop for a Clayton S.2 car heater. | 16th Dec 1936 | Box 137 \ 1 scan0217 | |
| Graph charting the output of Clayton S.2 type car heaters against motor volts. | 16th Dec 1936 | Box 137 \ 1 scan0218 | |
| Letter to S. Guiterman & Co. Ltd. regarding the order and testing of a Tropic-Aire car heater. | 15th Dec 1936 | Box 137 \ 1 scan0219 | |
| Letter from S. Guiterman & Co. Ltd. regarding Tropic-Aire Heaters and awaiting test reports on the Universal Model. | 16th Dec 1936 | Box 137 \ 1 scan0220 | |
| Payment status of a Universal model car heater sent on loan for testing. | 16th Dec 1936 | Box 137 \ 1 scan0221 | |
| Letter to Clayton Dewandre Ltd. regarding missing data for an S.Z. car heater. | 16th Dec 1936 | Box 137 \ 1 scan0222 | |
| Letter from Clayton Dewandre Co. Ltd. regarding the preparation of data for an S.2 car heater. | 17th Dec 1936 | Box 137 \ 1 scan0223 | |
| The fitting of a Harrison Twin Flow car heater to car 35-EX for France. | 18th Dec 1936 | Box 137 \ 1 scan0224 | |
| Trial report detailing the physical dimensions, weights, and performance of a Tropic-Aire Universal Model Car Heater. | 18th Dec 1936 | Box 137 \ 1 scan0225 | |
| Blueprint with specifications and performance graph for a Tropic-Aire Universal Model Car Heater. | 14th Dec 1936 | Box 137 \ 1 scan0226 | |
| Graph showing the performance characteristics of a Tropic-Aire Universal Model car heater, plotting pressure drop and dissipation against water flow. | 14th Dec 1936 | Box 137 \ 1 scan0227 | |
| Letter from Clayton Dewandre Company Limited providing data on various car heater models. | 22th Dec 1936 | Box 137 \ 1 scan0228 | |
| Page two of a letter from Clayton Dewandre Co. Ltd. | 22th Dec 1936 | Box 137 \ 1 scan0229 | |
| Chart showing the heat output of an S.2 car heater in relation to air flow. | 22th Dec 1936 | Box 137 \ 1 scan0230 | |
| Chart showing the heat output of an S2 car heater at varying fan speeds and regulator positions. | 22th Dec 1936 | Box 137 \ 1 scan0231 | |
| Chart showing the heat output of an S.2 car heater at varying water flow rates. | 22th Dec 1936 | Box 137 \ 1 scan0232 | |
| Chart showing the current drawn by an S.2 car heater motor at various regulator positions. | 1st Jan 1937 | Box 137 \ 1 scan0233 | |
| Instruction to connect the Clayton car-heaters on cars 36-EX and 38-EX to the engine's water system. | 1st Jan 1937 | Box 137 \ 1 scan0234 | |
| Request to order two Harrison Twin Flow car heaters and to return a Tropic Aire Universal heater that was on loan. | 5th Jan 1938 | Box 137 \ 1 scan0235 | |
| Return of a loaned Tropic-aire Universal car heater. | 6th Jan 1937 | Box 137 \ 1 scan0236 | |
| Correspondence regarding the return of a Universal Heater and a discussion of test results. | 7th Jan 1937 | Box 137 \ 1 scan0237 | |
| Letter regarding the testing and return of a Universal car heater. | 5th Jan 1937 | Box 137 \ 1 scan0238 | |
| Requesting the fitting of a Tropic Aire Car Heater into a 22.G.V. car. | 14th Jan 1937 | Box 137 \ 1 scan0239 | |
| Requesting rectification of a faulty heater warning light and substitution of the heater's rheostat. | 14th Jan 1937 | Box 137 \ 1 scan0240 | |
| Requesting the fitting of a Hadees H.30 car heater to a 3-B-IV car. | 16th Jan 1937 | Box 137 \ 1 scan0241 | |
| Fitting of a Harrison car heater to the first Wraith car. | 19th Jan 1937 | Box 137 \ 1 scan0242 | |
| Requesting details on a car heater fitted to car 38-EX and questioning the voltage of its components. | 26th Jan 1937 | Box 137 \ 1 scan0243 | |
| The order of a dozen spare G-E. Mazda 53 bulbs for a Tropic-Aire De Luxe Car Heater. | 26th Jan 1937 | Box 137 \ 1 scan0244 | |
| Manufacturing origins and electrical specifications of a Delco heater. | 28th Jan 1937 | Box 137 \ 1 scan0245 | |
| Telegram requesting three 12V Harrison twin flow car heaters by return. | 30th Jan 1937 | Box 137 \ 1 scan0246 | |
| The specifications (weight, price, output) of a Delco heater for car 38-EX. | 1st Feb 1937 | Box 137 \ 1 scan0247 | |
| Requesting an official order be sent to Delco Remy Hyatt Ltd. for three Harrison Twinflow Car Heaters. | 2nd Feb 1937 | Box 137 \ 1 scan0248 | |
| Returning incorrectly ordered Mazda 6V car heater electric bulbs. | 10th Feb 1937 | Box 137 \ 1 scan0249 | |
| Return of incorrect electric bulbs for replacement. | 10th Feb 1937 | Box 137 \ 1 scan0250 | |
| Dispatch of a Harrison car heater to Messrs John Marstons for examination on loan. | 13th Mar 1937 | Box 137 \ 1 scan0251 | |
| Letter to Delco Remy & Hyatt Ltd. requesting two types of car heaters for evaluation in a Ph.III car. | 13th Mar 1937 | Box 137 \ 1 scan0252 | |
| Letter from Delco-Remy & Hyatt Ltd. regarding the supply of a Harrison 'Twinflow' Car Heater for a Phantom III. | 15th Mar 1937 | Box 137 \ 1 scan0253 | |
| Page 2 of a letter from DELCO-REMY & HYATT, LTD. concerning an investigation into an application. | 16th Mar 1937 | Box 137 \ 1 scan0254 | |
| Different models of car heaters and requesting to obtain a Mc.Cord heater for testing. | 16th Mar 1937 | Box 137 \ 1 scan0255 | |
| Arranging for a McCord car heater with a defrosting attachment to be sent for trial. | 17th Mar 1937 | Box 137 \ 1 scan0256 | |
| Request to send an official order for a Harrison Twin Flow car heater that has already been received. | 24th Mar 1937 | Box 137 \ 1 scan0257 | |
| Letter to Delco-Remy & Hyatt Ltd. correcting specifications for a Harrison twin flow car heater and requesting bulbs. | 24th Mar 1937 | Box 137 \ 1 scan0258 | |
| Requesting the dispatch of a Mc.Cord car heater to Messrs Clayton Dewandre Ltd. for testing. | 31th Mar 1937 | Box 137 \ 1 scan0259 | |
| Letter to Clayton Dewandre Ltd. requesting they test a McCord car heater. | 31th Mar 1937 | Box 137 \ 1 scan0260 | |
| Letter from Clayton Dewandre Co. Ltd. confirming receipt of a McCord Car Heater for testing. | 1st Apr 1937 | Box 137 \ 1 scan0261 | |
| Letter from a supplier regarding the specifications of car heaters and potential future refinements. | 25th Mar 1937 | Box 137 \ 1 scan0262 | |
| Requesting an order for a Harrison twin flow car heater for car 26-G-VI. | 10th Apr 1937 | Box 137 \ 1 scan0263 | |
| Fitting of a Harrison twin flow car heater to chassis 26.G.6. | 10th Apr 1937 | Box 137 \ 1 scan0264 | |
| Comparison table of physical dimensions, weights, and performance for a Tropic-Aire and a McCord car heater. | 17th Apr 1939 | Box 137 \ 1 scan0265 | |
| Blueprint with specifications and performance graph for a McCord Car Heater, Model CH. 102. | 17th Apr 1939 | Box 137 \ 1 scan0266 | |
| Graph showing dissipation and pressure drop versus water flow for a McCord Car Heater Model CH.102. | 17th Apr 1937 | Box 137 \ 1 scan0267 | |
| Letter to Clayton Dewandre Co. Ltd. regarding car heater data and arranging a test for a new oil cooler. | 19th May 1937 | Box 137 \ 1 scan0268 | |
| Letter from Clayton Dewandre Company Ltd. regarding test results for a McCord car heater. | 21th Apr 1937 | Box 137 \ 1 scan0269 | |
| Letter from Clayton Dewandre Co. Ltd. regarding car heaters and the trial installation of an oil cooler. | 20th May 1937 | Box 137 \ 1 scan0270 | |
| Letter to Clayton Dewandre Co. Ltd. regarding the testing of car heaters and a private marine engine cooling problem. | 8th Jul 1937 | Box 137 \ 1 scan0271 | |
| Letter from Clayton Dewandre Company Limited regarding testing car heaters and oil coolers. | 9th Jul 1937 | Box 137 \ 1 scan0272 | |
| Covering letter from Clayton Dewandre Company Ltd. enclosing a Test Shop report and charts. | 9th Jul 1937 | Box 137 \ 1 scan0273 | |
| Letter to Messrs Clayton Dewandre Co. Ltd. regarding car heater tests and clarifying an engine cooling problem. | 12th Jul 1937 | Box 137 \ 1 scan0274 | |
| Data for the cooling system of a 15 HP marine engine. | 14th Jul 1937 | Box 137 \ 1 scan0275 | |
| Return of a Clayton car heater to Messrs. Clayton Dewandre for alterations. | 14th Jul 1937 | Box 137 \ 1 scan0276 | |
| Letter to Clayton Deandre Ltd. regarding the return and potential conversion of a car heater. | 14th Jul 1937 | Box 137 \ 1 scan0277 | |
| Letter from Clayton Dewandre Co. Ltd. regarding the modification and output of a Clayton Car Heater. | 15th Jul 1937 | Box 137 \ 1 scan0278 | |
| The return of a Clayton car heater for conversion and parts. | 16th Jul 1937 | Box 137 \ 1 scan0279 | |
| Provision for fitting car heaters on the Bentley III dashboard. | 26th Aug 1937 | Box 137 \ 1 scan0280 | |
| Letter to Clayton Dewandre Ltd. regarding unsatisfactory car heaters and requesting a modified version with drawings. | 30th Aug 1937 | Box 137 \ 1 scan0281 | |
| Sourcing and design considerations for a new car heater. | 30th Aug 1937 | Box 137 \ 1 scan0282 | |
| Transfer and subsequent return of oil cooler No. E278. | 31th Aug 1937 | Box 137 \ 1 scan0283 | |
| Letter from Clayton Dewandre Company Limited regarding the despatch of a modified heater and its drawing for testing. | 1st Sep 1937 | Box 137 \ 1 scan0284 | |
| Request to order two Clayton Dewandre S.2.C.A. type car heaters. | 29th Sep 1937 | Box 137 \ 1 scan0285 | |
| Dispatch of a Harrison car heater and switch to Conduit St. | 29th Sep 1937 | Box 137 \ 1 scan0286 | |
| The despatch of a Harrison car heater and switch to Mr. Honeyman in London. | 29th Sep 1937 | Box 137 \ 1 scan0287 | |
| Listing parts required to fit Clayton car heaters to two Bentley cars. | 30th Sep 1937 | Box 137 \ 1 scan0288 | |
| Request to prepare a set of parts for fitting a Clayton car heater to a Ph.III car. | 4th Oct 1937 | Box 137 \ 1 scan0289 | |
| Sales letter from Gordon Equipments Ltd suggesting the installation of Chanson car heaters. | 7th Oct 1937 | Box 137 \ 1 scan0290 | |
| Letter to The Gordon Equipment Ltd. regarding the potential installation of their car heaters. | 9th Oct 1937 | Box 137 \ 1 scan0291 | |
| Letter from Gordon Equipments Ltd regarding a sample Car Heater and an invitation to an exhibition. | 12th Oct 1937 | Box 137 \ 1 scan0292 | |
| Letter to Gordon Equipments Ltd. arranging an inspection of a heater at the Motor Show. | 15th Oct 1937 | Box 137 \ 1 scan0293 | |
| Letter from Gordon Equipments Ltd regarding their presence at exhibitions and demonstrating a heater. | 18th Oct 1937 | Box 137 \ 1 scan0294 | |
| Letter to The Gordon Equipment Ltd. arranging for Mr. Steadman to inspect their heater at the Motor Show. | 20th Oct 1937 | Box 137 \ 1 scan0295 | |
| Letter from Gordon Equipments Ltd. about a missed appointment at a show and attempting to reschedule a visit. | 26th Oct 1937 | Box 137 \ 1 scan0296 | |
| Product leaflet for Chanson Hot Water Car Heaters, showing various models and their features. | 26th Oct 1937 | Box 137 \ 1 scan0297 | |
| Product catalogue page for various models of Gordon Gnome Battery Chargers. | 27th Oct 1937 | Box 137 \ 1 scan0298 | |
| Letter to Gordon Equipments Ltd. arranging a meeting with Mr. Gordon. | 27th Oct 1937 | Box 137 \ 1 scan0299 | |
| Letter from Gordon Equipments Ltd confirming Mr. Gordon's visit to Derby. | 28th Oct 1937 | Box 137 \ 1 scan0300 | |
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