| Description | Date | Identifier | |
| Page 2 of a letter from Clayton Dewandre Co. Ltd. regarding the analysis of trials on a tube matrix and cooler. | 18th Aug 1936 | Box 131 \ 1 scan0211 | |
| Comparison table of three different oil cooler models. | 18th Aug 1936 | Box 131 \ 1 scan0212 | |
| Issues with oil temperature on the Bentley and proposing design improvements. | 21th Aug 1936 | Box 131 \ 1 scan0213 | |
| Oil pressure trials conducted by Clayton Dewandre Co. Ltd. | 27th Aug 1936 | Box 131 \ 1 scan0214 | |
| Oil pressure trials conducted on three different types of oil coolers. | 27th Aug 1936 | Box 131 \ 1 scan0215 | |
| Diagrammatic arrangement of an oil cooler pressure test. | 27th Oct 1936 | Box 131 \ 1 scan0216 | |
| High oil temperature on a Bentley and proposing potential solutions. | 20th Aug 1936 | Box 131 \ 1 scan0217 | |
| Letter from Clayton Dewandre Co. Ltd. concerning the failure of Oil Cooler Trials due to a lack of physical strength. | 28th Aug 1936 | Box 131 \ 1 scan0218 | |
| Chart showing the variation in pressure drop across oil cooler No.1 due to changes in oil flow, oil temperature, and water flow. | 17th Mar 1926 | Box 131 \ 1 scan0219 | |
| Performance graph and specifications for Oil Cooler No.1 using Mobiloil 'A'. | 12th Aug 1936 | Box 131 \ 1 scan0220 | |
| Chart showing pressure drop variations in Oil Cooler No. 2 due to changes in oil flow, oil temperature, and water flow. | 21th Aug 1936 | Box 131 \ 1 scan0221 | |
| Performance test data and diagram for a No. 2 tubular honeycomb oil cooler element. | 12th Aug 1936 | Box 131 \ 1 scan0222 | |
| Chart showing the effect of oil flow, oil temperature, and water flow upon the pressure drop across Oil Cooler No. 3. | 1st May 1936 | Box 131 \ 1 scan0223 | |
| Performance chart for Oil Cooler No. 3, a tubular honeycomb element. | 17th Mar 1936 | Box 131 \ 1 scan0224 | |
| Letter from John Marston Ltd. regarding distortion issues with four Oil Coolers. | 5th Sep 1936 | Box 131 \ 1 scan0225 | |
| Graph comparing the performance of Gallay and RR oil coolers by plotting heat dissipation and pressure drop against fluid flow rates. | 11th Oct 1936 | Box 131 \ 1 scan0226 | |
| Requesting investigation into American air conditioning and combined heater/defroster units, and a weight comparison with English heaters. | 16th Oct 1936 | Box 131 \ 1 scan0227 | |
| Letter from Clayton Dewandre Company regarding the return of a loaned sheet metal oil cooler box cover. | 20th Oct 1936 | Box 131 \ 1 scan0228 | |
| Letter from Clayton Dewandre Co. Ltd. enclosing Oil Cooler Charts and a paper on vehicle heating and ventilation. | 9th Nov 1936 | Box 131 \ 1 scan0229 | |
| Graph plotting oil pressure drop across a seamed tube oil cooler against oil flow for different mean oil temperatures. | 4th Dec 1935 | Box 131 \ 1 scan0230 | |
| Blueprint detailing the oil to water heat transmission performance of a seamed tube oil cooler. | 4th Dec 1931 | Box 131 \ 1 scan0231 | |
| Comparison graph of seamed tube oval flattened wire radiator elements, plotting HP dissipated and air pressure against air velocity. | 28th Feb 1936 | Box 131 \ 1 scan0232 | |
| Blueprint detailing specifications and performance data for a seamed tube oil cooler, including a heat transmission chart. | 4th Dec 1935 | Box 131 \ 1 scan0233 | |
| Performance chart and specifications for a seamed tube oil cooler. | 6th Dec 1935 | Box 131 \ 1 scan0234 | |
| Arranging the return of 8 Oil Coolers (E.87820) to Messrs. J. Marston Ltd. after testing. | 19th Nov 1936 | Box 131 \ 1 scan0235 | |
| Oil cooler failures, requesting the fitting of pipes and gauges to check pressures and temperatures. | 20th Nov 1936 | Box 131 \ 1 scan0236 | |
| Requesting mileage and maintenance history for failed Phantom III oil coolers. | 20th Nov 1936 | Box 131 \ 1 scan0237 | |
| Testing procedures for Phantom III oil coolers, including American practices. | 20th Nov 1936 | Box 131 \ 1 scan0238 | |
| Production test specifications for oil temperature regulators. | 21th Nov 1936 | Box 131 \ 1 scan0239 | |
| Improved outer plate for the Phantom III chassis oil temperature regulator. | 19th Nov 1936 | Box 131 \ 1 scan0240 | |
| Letter from John Marston Limited regarding the manufacturing, testing, and improvement of oil coolers. | 20th Nov 1936 | Box 131 \ 1 scan0241 | |
| Letter to a supplier concerning oil cooler testing, failures, and design modifications. | 20th Nov 1936 | Box 131 \ 1 scan0242 | |
| Analysis of cooler failures due to soldering and distortion, with proposed corrective actions by a supplier. | 20th Nov 1936 | Box 131 \ 1 scan0243 | |
| Letter discussing modifications to coolers, production methods, solder composition, and radiator matrix weights. | 21th Nov 1936 | Box 131 \ 1 scan0244 | |
| Letter from John Marston Limited regarding oil coolers, solder composition, and radiator matrices. | 21th Nov 1936 | Box 131 \ 1 scan0245 | |
| Request for an official order to be sent to Messrs John Marstens for repair work on a Phantom III oil cooler. | 25th Nov 1936 | Box 131 \ 1 scan0246 | |
| Order for a modified Ph.III oil cooler from John Marston Ltd. | 27th Nov 1936 | Box 131 \ 1 scan0247 | |
| Oil temperature regulator (cooler) failures on PH.III cars 3-AZ-88 and 3-AZ-98. | 1st Dec 1936 | Box 131 \ 1 scan0248 | |
| Pressure testing an oil cooler, detailing test results, failures, and proposed modifications. | 1st Dec 1936 | Box 131 \ 1 scan0249 | |
| Diagram showing the positions of leaks on PH. III oil coolers. | 3rd Dec 1936 | Box 131 \ 1 scan0250 | |
| Letter from John Marston Ltd. regarding leaking oil coolers and the results of pressure testing experiments. | 3rd Dec 1936 | Box 131 \ 1 scan0251 | |
| Letter from John Marston Ltd. discussing pressure test failures on a cooler and suggesting design improvements. | 5th Dec 1936 | Box 131 \ 1 scan0252 | |
| Letter to John Marstons Ltd. regarding the development and testing of an oil cooler. | 5th Dec 1936 | Box 131 \ 1 scan0253 | |
| Letter from John Marston Limited regarding modifications to an Oil Cooler design. | 8th Dec 1936 | Box 131 \ 1 scan0254 | |
| Letter from John Marston Limited concerning the design, testing, and delivery of an Oil Cooler. | 15th Dec 1936 | Box 131 \ 1 scan0255 | |
| Letter from John Marston Ltd. regarding a replacement order for three oil coolers and awaiting comment before proceeding with a repair. | 15th Dec 1936 | Box 131 \ 1 scan0256 | |
| Agreement with Messrs John Marston's Works concerning three oil coolers with damaged threads. | 30th Dec 1936 | Box 131 \ 1 scan0257 | |
| Requesting guidance on replying to queries from Mr. Marcus W. Bourdon regarding drawings. | 4th Jan 1937 | Box 131 \ 1 scan0258 | |
| Letter from John Marston Limited regarding the dispatch and manufacturing difficulties of two Oil Coolers, E.87820. | 11th Jan 1937 | Box 131 \ 1 scan0259 | |
| Letter from John Marston Limited discussing design alterations, including a 1/32' radius to prevent damage to unions, and washers for an aluminium casting. | 12th Jan 1937 | Box 131 \ 1 scan0260 | |
| Brief letter from John Marston Ltd to correct an omission from a previous day's correspondence. | 12th Jan 1937 | Box 131 \ 1 scan0261 | |
| Letter to John Marston Ltd. discussing the cost, design modifications, and testing of experimental oil coolers. | 14th Jan 1937 | Box 131 \ 1 scan0262 | |
| Letter detailing dimensional modifications for a cooler's top plate, unions, and washer area. | 14th Jan 1937 | Box 131 \ 1 scan0263 | |
| Clarifying that the 'oil temperature regulator' is in fact a matrix-type oil cooler. | 14th Jan 1937 | Box 131 \ 1 scan0264 | |
| Modifications to Oil Temperature Regulator Matrix Units to prevent thread damage. | 15th Jan 1937 | Box 131 \ 1 scan0265 | |
| Phantom III oil cooler matrix sent for examination and its return to Messrs. John Marston. | 16th Jan 1937 | Box 131 \ 1 scan0266 | |
| Letter concerning the design, cost, and production of oil coolers. | 18th Jan 1937 | Box 131 \ 1 scan0267 | |
| Letter from John Marston Limited regarding the near completion of Bentley Shutters. | 18th Jan 1937 | Box 131 \ 1 scan0268 | |
| Letter from John Marston Limited regarding the repair or replacement of two failed oil coolers. | 20th Jan 1937 | Box 131 \ 1 scan0269 | |
| Official order for a modified Phantom III oil cooler from John Marston. | 25th Jan 1937 | Box 131 \ 1 scan0270 | |
| Experiment to test the placement of a Phantom III oil cooler in the water system of a Wraith engine. | 1st Feb 1937 | Box 131 \ 1 scan0271 | |
| Graph plotting results from an oil cooler in water system experiment, comparing performance with and without the cooler. | 29th Jan 1937 | Box 131 \ 1 scan0272 | |
| Testing of an experimental oil cooler by enclosing it in a water box. | 21th May 1937 | Box 131 \ 1 scan0273 | |
| The despatch of an experimental oil cooler for testing purposes. | 14th Jun 1937 | Box 131 \ 1 scan0274 | |
| Letter to Messrs Clayton Dewandre Ltd. regarding the testing of an experimental oil cooler. | 14th Jun 1937 | Box 131 \ 1 scan0275 | |
| Cooling figures for a 15.HP marine engine and an overheating issue on a customer's car. | 14th Jul 1937 | Box 131 \ 1 scan0276 | |
| Particulars of a cooler for a single 15.HP marine engine. | 15th Jun 1937 | Box 131 \ 1 scan0277 | |
| Letter from Clayton Dewandre Co. Ltd. confirming arrangements to carry out experiments with an oil cooler. | 15th Jun 1937 | Box 131 \ 1 scan0278 | |
| Letter from John Marston Ltd. regarding performance curves for an oil cooler and samples of car heaters. | 21th Jul 1937 | Box 131 \ 1 scan0279 | |
| Investigation into the cooling system and water thermometers on a Phantom III. | 1st Aug 1937 | Box 131 \ 1 scan0280 | |
| The procedure for handling failures of Ph.III oil cooler units. | 14th Aug 1937 | Box 131 \ 1 scan0281 | |
| Request to send an official order to John Marstons Ltd. for a modified Ph.III oil cooler. | 16th Aug 1937 | Box 131 \ 1 scan0282 | |
| Despatch of three Ph.III oil cooler units to Messrs John Marston Ltd. for examination. | 16th Aug 1937 | Box 131 \ 1 scan0283 | |
| Instructing the works to start recording oil cooler numbers against their respective engine units. | 17th Aug 1937 | Box 131 \ 1 scan0284 | |
| Letter to John Marston Ltd. regarding the inspection, repair, and potential conversion of Phantom III oil coolers. | 17th Aug 1937 | Box 131 \ 1 scan0285 | |
| Instruction memo regarding the examination and repair of used coolers. | 17th Aug 1937 | Box 131 \ 1 scan0286 | |
| The failure of Phantom III oil coolers, detailing the number of failures and types. | 17th Aug 1937 | Box 131 \ 1 scan0287 | |
| Conclusions and summary regarding failures and reliability of different cooler types. | 1st Aug 1937 | Box 131 \ 1 scan0288 | |
| Requesting an investigation into repeated oil cooler failures on two Phantom III cars. | 17th Aug 1937 | Box 131 \ 1 scan0289 | |
| Failures of Phantom III oil coolers. | 17th Aug 1937 | Box 131 \ 1 scan0290 | |
| Conclusions and a summary regarding failures of different types of coolers. | 1st Aug 1937 | Box 131 \ 1 scan0291 | |
| The failure and replacement of a fan belt, bearings, and fan for a 32-EX Phantom III cooling system. | 17th Aug 1937 | Box 131 \ 1 scan0292 | |
| The cooling system performance and boiling issues of the Phantom III experimental car 32-EX. | 17th Aug 1937 | Box 131 \ 1 scan0293 | |
| Responding to an inquiry about boiling issues with the Phantom III cooling system during testing. | 17th Aug 1937 | Box 131 \ 1 scan0294 | |
| The cooling system of a 32-EX Phantom III, detailing issues with fan belts and bearings. | 17th Aug 1937 | Box 131 \ 1 scan0295 | |
| Visit to Messrs. John Marston Ltd. in Wolverhampton to discuss radiators, coolers, and car heaters. | 18th Aug 1937 | Box 131 \ 1 scan0296 | |
| Investigation into oil cooler failures and radiator manufacturing methods with supplier John Marston. | 10th Aug 1937 | Box 131 \ 1 scan0297 | |
| Sample car heaters and hydrogen brazing experiments by supplier Marstons. | 18th Aug 1937 | Box 131 \ 1 scan0298 | |
| The cooling system of a 32-EX Phantom III, detailing reports, parts dispatch, and planned tests. | 19th Aug 1937 | Box 131 \ 1 scan0299 | |
| Oil and water temperature tests conducted on a 32-EX Phantom III without an oil cooler. | 20th Aug 1937 | Box 131 \ 1 scan0300 | |
| Requesting the tracking of Phantom III oil cooler serial numbers to trace failures. | 24th Aug 1937 | Box 131 \ 1 scan0301 | |
| Depot complaints and the replacement of Phantom III oil coolers. | 27th Aug 1937 | Box 131 \ 1 scan0302 | |
| Oil cooler unit from chassis 3BU-62 for examination and repair. | 30th Aug 1937 | Box 131 \ 1 scan0303 | |
| The examination and disposal of an oil cooler unit from chassis 3BU-146. | 30th Aug 1937 | Box 131 \ 1 scan0304 | |
| Handing over of an oil cooler unit from chassis 3BO-116 for examination and advice on its disposal. | 30th Aug 1937 | Box 131 \ 1 scan0305 | |
| Handover of an oil cooler unit for chassis 3-AX-9 and a request for disposal advice. | 30th Aug 1937 | Box 131 \ 1 scan0306 | |
| Types and fitment of oil coolers for the Phantom III series. | 30th Aug 1937 | Box 131 \ 1 scan0307 | |
| Development and testing of pressure cooling systems in car radiators. | 3rd Sep 1937 | Box 131 \ 1 scan0308 | |
| Tests carried out on an experimental pressurized cooling system fitted to car model 39-EX. | 1st Sep 1937 | Box 131 \ 1 scan0309 | |
| Test report on a car's cooling system, detailing valve performance, fan suitability, and road test results. | 1st Sep 1937 | Box 131 \ 1 scan0310 | |
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