| Description | Date | Identifier | |
| Report from Harrison Radiator Corporation discussing engine cooling system performance and design considerations. | 18th Aug 1936 | Box 149a \ 3 scan0178 | |
| Suggestions to improve the Phantom car's cooling system, addressing issues like steam formation, crankcase distortion, and radiator suction effects. | 18th Aug 1936 | Box 149a \ 3 scan0179 | |
| Letter from Harrison Radiator Corporation discussing radiator core configurations, oil cooler production, and test results. | 18th Aug 1936 | Box 149a \ 3 scan0180 | |
| Letter from Harrison Radiator Corporation discussing cooling system performance, diagnostics, and top tank temperature. | 18th Aug 1936 | Box 149a \ 3 scan0181 | |
| Letter to the Modine Manufacturing Co. requesting assistance and test data for a car radiator cooling problem. | 21th Sep 1936 | Box 149a \ 3 scan0182 | |
| Letter to Mr. Dunn of John Marston Ltd regarding his upcoming visit to Modine Manufacturing Co. in the U.S.A. to discuss cooling problems. | 21th Sep 1936 | Box 149a \ 3 scan0183 | |
| Letter to The Harrison Radiator Corporation regarding radiator development and air temperature figures for the Phantom III car. | 21th Sep 1936 | Box 149a \ 3 scan0184 | |
| Radiator core specifications, steam pocket formation, and heat dissipation improvements. | 21th Sep 1936 | Box 149a \ 3 scan0185 | |
| Letter discussing engine heat to jacket water figures, comparing them to other engines and mentioning a forthcoming visit from a radiator specialist. | 21th Sep 1936 | Box 149a \ 3 scan0186 | |
| Summary of radiator test results comparing different fans and cowlings. | 21th Sep 1936 | Box 149a \ 3 scan0187 | |
| Table of critical air temperatures for Phantom III, Bentley, and 20/25 HP cars under various test conditions. | 24th Sep 1936 | Box 149a \ 3 scan0188 | |
| The order of radiator matrices from two suppliers. | 24th Sep 1936 | Box 149a \ 3 scan0189 | |
| Night letter cablegram to Harrison Radiator Corporation requesting a specific type of core. | 6th Oct 1936 | Box 149a \ 3 scan0190 | |
| Telegram from Harrison Radiator Corp. requesting advice on tools for different core sizes. | 6th Oct 1936 | Box 149a \ 3 scan0191 | |
| Letter from Harrison Radiator Corporation discussing radiator core specifications and cooling test results for the Phantom lll. | 7th Oct 1936 | Box 149a \ 3 scan0192 | |
| Page 2 of a letter from Harrison Radiator Corporation discussing radiator core performance and airflow. | 7th Oct 1936 | Box 149a \ 3 scan0193 | |
| Letter from Harrison Radiator Corporation discussing engine heat output, radiator core sizes and cooling system design. | 7th Oct 1936 | Box 149a \ 3 scan0194 | |
| Letter from Harrison Radiator Corporation discussing cooling problems and cylinder head design. | 7th Oct 1936 | Box 149a \ 3 scan0195 | |
| Performance chart for a Harrison Radiator, showing dissipation, air rise, and pressure against air flow. | 7th Jul 1927 | Box 149a \ 3 scan0196 | |
| Letter discussing engine cooling experiments, port jacketing, cylinder head coring, and the future possibilities of car air conditioning. | 20th Oct 1936 | Box 149a \ 3 scan0197 | |
| Series of inquiries regarding car heaters, radiator rust preventives, and comparative tests on aircraft radiator cores. | 20th Oct 1936 | Box 149a \ 3 scan0198 | |
| Conclusion to a report on tests to determine the best matrix for machine cowlings, mentioning Anderton and Brown tubes. | 20th Oct 1936 | Box 149a \ 3 scan0199 | |
| Criticisms from Harrison Radiator Corporation on the Phantom III Cylinder Head water-way design and proposals for experimental changes. | 20th Oct 1936 | Box 149a \ 3 scan0200 | |
| Letter from Harrison Radiator Corporation regarding cooling inhibitors, water jackets, air conditioning, and car heaters. | 4th Dec 1936 | Box 149a \ 3 scan0201 | |
| Letter from Harrison Radiator Corporation concerning defrosters, car heaters, and vehicle air infiltration. | 12th Apr 1936 | Box 149a \ 3 scan0202 | |
| Letter from Harrison Radiator Corporation discussing aircraft radiator cores and why they are passing on the project. | 12th Apr 1936 | Box 149a \ 3 scan0203 | |
| Letter from Harrison Radiator Division regarding the supply of production thermostats. | 13th Apr 1937 | Box 149a \ 3 scan0204 | |
| Blueprint drawing for a Chevrolet thermostat assembly with specifications. | 24th Feb 1937 | Box 149a \ 3 scan0205 | |
| Letter to Harrison Radiator Division regarding thermostat specifications, queries, and a request for samples. | 8th Jul 1937 | Box 149a \ 3 scan0206 | |
| Letter to the Harrison Radiator Division of General Motors regarding oil coolers and thermostats. | 16th Oct 1937 | Box 149a \ 3 scan0207 | |
| Letter discussing changes to thermostat systems, sourcing fan belts, and testing corrosion inhibitors. | 19th Oct 1937 | Box 149a \ 3 scan0208 | |
| Letter from Harrison Radiator Division concerning an oil cooler assembly being shipped for approval. | 19th Oct 1937 | Box 149a \ 3 scan0209 | |
| Quotation letter from Harrison Radiator Division for a hydrogen brazed plate type oil cooler. | 21th Oct 1937 | Box 149a \ 3 scan0210 | |
| Letter to the Harrison Radiator Corporation apologising for a delay in clearing invoice No.13458. | 29th Oct 1937 | Box 149a \ 3 scan0211 | |
| Night letter telegram requesting drawings and particulars for an automatic fan belt tensioner. | 1st Nov 1937 | Box 149a \ 3 scan0212 | |
| Letter to The Harrison Radiator Corporation acknowledging a quotation for hydrogen brazed oil coolers. | 3rd Nov 1937 | Box 149a \ 3 scan0213 | |
| Letter to The Harrison Radiator Corporation regarding a quotation for coolers and inquiring about fan belts, drives, and tensioning devices. | 3rd Nov 1937 | Box 149a \ 3 scan0214 | |
| Letter discussing water loss and boiling issues with a 1937 Packard vehicle. | 15th Nov 1937 | Box 149a \ 3 scan0215 | |
| Letter from Harrison Radiator Division regarding the supply and manufacture of coolers, thermostats, and fan belts. | 15th Nov 1937 | Box 149a \ 3 scan0216 | |
| Letter discussing variable pitch fans, fan belt reliability, and related engine cooling system issues. | 15th Nov 1937 | Box 149a \ 3 scan0217 | |
| Letter from Harrison Radiator Division regarding the addresses of fan belt suppliers. | 20th Dec 1937 | Box 149a \ 3 scan0218 | |
| Letter to The Harrison Radiator Corporation apologising for a delay and confirming that official orders have been issued. | 6th Jan 1938 | Box 149a \ 3 scan0219 | |
| Letter from Harrison Radiator Division to Mr. Steadman discussing cooling systems and requesting a copy of his upcoming paper. | 7th Apr 1938 | Box 149a \ 3 scan0220 | |
| Letter to L.P. Saunders of General Motors discussing a paper on cooling system practice and design. | 27th Apr 1938 | Box 149a \ 3 scan0221 | |
| Letter to W.L.P. Saunders discussing car heater design, thermostat noise, and oil cooler issues. | 27th Apr 1958 | Box 149a \ 3 scan0222 | |
| Letter from Harrison Radiator Division discussing various aspects of engine cooling systems. | 9th Sep 1938 | Box 149a \ 3 scan0223 | |
| Letter from Harrison to C. S. Steadman discussing car heater systems, bellows, oil coolers, and airplane cooling systems. | 9th Sep 1938 | Box 149a \ 3 scan0224 | |
| Letter to C. S. Steadman regarding the consideration of an all-brazed copper radiator and the construction of a new, larger car tunnel. | 9th Sep 1938 | Box 149a \ 3 scan0225 | |
| Letter to Harrison Radiator Division requesting curves for radiator matrix heat dissipation for design and comparison. | 15th Sep 1938 | Box 149a \ 3 scan0226 | |
| Radiator core performance and an experimental Buick bye-pass thermostat arrangement. | 3rd Nov 1938 | Box 149a \ 3 scan0227 | |
| Letter to General Motors discussing variable pitch fans and pressure cooling systems. | 17th Nov 1938 | Box 149a \ 3 scan0228 | |
| Letter to L.P. Saunders discussing experiments with copper brazed radiators, pressure cooling, and ethylene glycol cooling. | 17th Nov 1938 | Box 149a \ 3 scan0229 | |
| Letter to L.P. Saunders discussing engine oil coolers, heating and ventilation systems, thermostat schemes, and radiator design. | 17th Nov 1938 | Box 149a \ 3 scan0230 | |
| Letter to L.P. Saunders regarding an offer to send drawings and details of new equipment. | 17th Nov 1938 | Box 149a \ 3 scan0231 | |
| Information regarding the use of Ethylene Glycol in pressure cooling systems for aero engines. | 16th Nov 1938 | Box 149a \ 3 scan0232 | |
| The characteristics and challenges of glycol and pressure cooling systems. | 16th Nov 1938 | Box 149a \ 3 scan0233 | |
| Page discussing engine pressure cooling systems, steam pockets, and a comparison with Ethylene Glycol. | 16th Nov 1938 | Box 149a \ 3 scan0234 | |
| Letter announcing an engineer's move to John Marston Ltd. and the handover of responsibilities for heat interchange matters. | 26th Jan 1939 | Box 149a \ 3 scan0235 | |
| Letter from Harrison Radiator Division offering continued assistance following a resignation. | 17th Feb 1939 | Box 149a \ 3 scan0236 | |
| Letter from Harrison Radiator Division discussing fan blade pitch control, pressure cooling issues, and copper brazing of radiators. | 7th Feb 1939 | Box 149a \ 3 scan0237 | |
| Letter to Mr. C. S. Steadman discussing cooling systems, radiator construction, a new car tunnel, and radiator materials. | 7th Feb 1939 | Box 149a \ 3 scan0238 | |
| Letter to Mr. L.R. Saunders of General Motors Corporation regarding a generous offer. | 1st May 1939 | Box 149a \ 3 scan0239 | |
| Letter from The Skefko Ball Bearing Company regarding the supply of spindles, the grease being used, and identification markings. | 3rd Jul 1939 | Box 149a \ 3 scan0240 | |
| Letter from The Morgan Crucible Company Limited arranging a meeting to discuss Morgan-Stuart Patent Gland Assemblies. | 3rd Jul 1939 | Box 149a \ 3 scan0241 | |
| Letter to The Leyland & Birmingham Rubber Co. Ltd. requesting production of a moulded rubber pipe without expensive tooling. | 6th Jul 1939 | Box 149a \ 3 scan0242 | |
| Visit from Morgan Crucible Co. Ltd. to discuss water pump glands and resulting conclusions. | 6th Jul 1939 | Box 149a \ 3 scan0243 | |
| Design modifications, costs, and competitor analysis for a gland and bearing assembly. | 6th Jul 1939 | Box 149a \ 3 scan0244 | |
| Letter from The Leyland & Birmingham Rubber Co Ltd regarding the cost and manufacturing constraints for sample hose connections part number ECD.1438. | 8th Jul 1939 | Box 149a \ 3 scan0245 | |
| Development of a pressure cooling system, including a water pump, relief valve, and fan matrix. | 11th Jul 1939 | Box 149a \ 3 scan0246 | |
| Request to modify a Bentley 80 water pump to test plain Hoffman bearings instead of sealed ones. | 18th Jul 1939 | Box 149a \ 3 scan0247 | |
| Letter from the Experimental Department requesting four L.S.5 bearings for an experimental rig. | 19th Jul 1939 | Box 149a \ 3 scan0248 | |
| Request for external and internal circlips for the Experimental Department. | 19th Jul 1939 | Box 149a \ 3 scan0249 | |
| The order of bearings and circlips for a water pump. | 19th Jul 1939 | Box 149a \ 3 scan0250 | |
| Acknowledgment of an order for Seeger Circlips, with a handwritten annotation. | 20th Jul 1939 | Box 149a \ 3 scan0251 | |
| Letter from Hoffmann Manufacturing regarding the dispatch of four LS.5 bearings with pressed type cages. | 24th Jul 1939 | Box 149a \ 3 scan0252 | |
| Clarifying the order of precedence for various B.80 water pump modifications and projects. | 21th Aug 1939 | Box 149a \ 3 scan0253 | |
| Letter from Hoffmann Manufacturing Co. Ltd. regarding the load on bearings for a belt pulley. | 30th Aug 1939 | Box 149a \ 3 scan0254 | |
| Instruction to use standard bearings for a B.80 water pump by modifying a distance piece due to mislaid special bearings. | 12th Feb 1940 | Box 149a \ 3 scan0255 | |
| Fitting a water pump to the Bentley 60 number I engine before it is passed to test. | 14th Mar 1940 | Box 149a \ 3 scan0256 | |
| Request to manufacture two coolant flow venturis, piece number EX.19444. | 29th Mar 1940 | Box 149a \ 3 scan0257 | |
| Request to pass an order to Messrs. Oscrofts for a Vauxhall 25 water pump. | 3rd Apr 1940 | Box 149a \ 3 scan0258 | |
| Recommendation to adopt a newer water pump design (DCD.1388) over the old B.80 type for new engines. | 5th Apr 1940 | Box 149a \ 3 scan0259 | |
| Request to modify a Vauxhall 25 water pump to fit a B.60 or B.80 engine. | 3rd Apr 1940 | Box 149a \ 3 scan0260 | |
| Modifications to specifications for B.80 water pumps, including potential use of Skefco bearings. | 10th Apr 1940 | Box 149a \ 3 scan0261 | |
| Comparison report between a proprietary B.80 water pump and a Vauxhall 25 water pump. | 10th Apr 1940 | Box 149a \ 3 scan0262 | |
| The comparison of a Vauxhall bakelite sealing washer against a carbon one, proposing an engine test. | 10th Apr 1940 | Box 149a \ 3 scan0263 | |
| Weight analysis of a Vauxhall 25 water pump and a B.80 water pump. | 1st Apr 1940 | Box 149a \ 3 scan0264 | |
| Exploded view photograph of a water pump assembly. | 1st Apr 1940 | Box 149a \ 3 scan0265 | |
| Exploded view of a water pump's components. | 1st Apr 1940 | Box 149a \ 3 scan0266 | |
| Incomplete specifications for the B.80 water pump and incorporating a new pump on future engines. | 11th Apr 1940 | Box 149a \ 3 scan0267 | |
| Modification of a water pump's bearing and sealing system. | 11th Aug 1940 | Box 149a \ 3 scan0268 | |
| Internal memorandum regarding an outdated water pump specification and the production of new parts. | 17th Apr 1940 | Box 149a \ 3 scan0269 | |
| Letter from The Skefko Ball Bearing Company Ltd. declining an order for a special water pump spindle bearing due to heavy commitments. | 9th Apr 1940 | Box 149a \ 3 scan0270 | |
| Notification about the swapping of water pumps and fans between two cars. | 13th May 1940 | Box 149a \ 3 scan0271 | |
| New blueprints for a water pump casing and the destruction of existing prints. | 17th May 1940 | Box 149a \ 3 scan0272 | |
| Letter from The Hoffmann Manufacturing Co. Ltd. regarding the supply and delivery of bearings. | 9th Nov 1940 | Box 149a \ 3 scan0273 | |
| The failure of a water pump, discussing potential causes and proposing a modified design with improved drainage. | 14th Nov 1940 | Box 149a \ 3 scan0274 | |
| Letter from The Hoffmann Manufacturing Co. Ltd. acknowledging an order for 24 No.117.FS bearings. | 28th Nov 1940 | Box 149a \ 3 scan0275 | |
| Letter from The Hoffmann Manufacturing Co., Ltd. stating a 14-week delivery time for bearings and detailing the conditions of sale. | 18th Dec 1940 | Box 149a \ 3 scan0276 | |
| Confirming the hand-off of a print for a new B.60 & B.80 water pump casing design. | 18th Dec 1940 | Box 149a \ 3 scan0277 | |
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