| Description | Date | Identifier | |
| Graph showing the variation of cooling with car speed for different depths of Marston Mk V radiator matrices. | 11th Oct 1935 | Box 149a \ 2 scan0271 | |
| Graph showing the variation of air speed through different radiator cores against car speed. | 11th Oct 1935 | Box 149a \ 2 scan0272 | |
| Graph comparing heat dissipation performance of Marston Mk V 52mm and 65mm radiator cores against air speed. | 20th Aug 1935 | Box 149a \ 2 scan0273 | |
| Graph plotting under-bonnet pressure in inches of water against vehicle speed in miles per hour. | 20th Aug 1935 | Box 149a \ 2 scan0274 | |
| Performance chart for a Vauxhall 14 HP radiator. | 20th Aug 1935 | Box 149a \ 2 scan0275 | |
| Performance chart for a Vauxhall 14 HP radiator, showing horsepower dissipated and air pressure against air flow. | 6th Nov 1935 | Box 149a \ 2 scan0276 | |
| Performance graph and specifications for a Vauxhall 14 HP radiator. | 6th Nov 1935 | Box 149a \ 2 scan0277 | |
| Letter from Gallay Ltd. concerning their patented non-erodible radiator cores and an offer to fit a sample for testing. | 15th Nov 1935 | Box 149a \ 2 scan0278 | |
| Page two of a letter from Gallay Ltd. concerning radiator efficiency and utility. | 15th Nov 1935 | Box 149a \ 2 scan0279 | |
| Letter to Gallay Ltd. regarding fitting their matrices to a Bentley radiator matrix. | 19th Nov 1935 | Box 149a \ 2 scan0280 | |
| The despatch of a Bentley Radiator Matrix to Gallay Ltd for modification. | 19th Nov 1935 | Box 149a \ 2 scan0281 | |
| Letter from Gallay Ltd. regarding fitting a non-erodible core to a Bentley radiator for a comparative test. | 20th Nov 1935 | Box 149a \ 2 scan0282 | |
| Letter to Harrison Radiator Corporation asking for an opinion on a competitor's radiator matrix and information on oil temperature regulators. | 26th Nov 1935 | Box 149a \ 2 scan0283 | |
| Letter to John Marston Ltd. requesting comparative efficiency figures for various radiator matrices. | 2nd Dec 1935 | Box 149a \ 2 scan0284 | |
| Letter to Gallay Ltd. requesting a Bentley radiator-oil cooler for testing and reminding them about outstanding heat dissipation figures. | 2nd Dec 1935 | Box 149a \ 2 scan0285 | |
| Letter from John Marston Limited acknowledging receipt of a letter for Mr. Southall, who is currently away. | 3rd Dec 1935 | Box 149a \ 2 scan0286 | |
| Letter to John Marston Ltd. requesting comparative weights and prices for different radiator matrices. | 4th Dec 1935 | Box 149a \ 2 scan0287 | |
| Letter from Gallay Ltd. discussing radiator cooling block options and requesting oil cooler pressure specifications. | 7th Dec 1935 | Box 149a \ 2 scan0288 | |
| Letter from John Marston Ltd. regarding tests and comparisons of different radiator matrix types. | 10th Dec 1935 | Box 149a \ 2 scan0289 | |
| Letter from John Marston Limited providing comparative weights and prices for various matrix types. | 11th Dec 1935 | Box 149a \ 2 scan0290 | |
| Letter from John Marston Ltd regarding the price of an experimental Mark VI block. | 11th Dec 1935 | Box 149a \ 2 scan0291 | |
| Letter to Messrs. Gallay Ltd. regarding specifications for an oil cooler, requesting heat dissipation figures and a quotation for different matrix types. | 18th Dec 1935 | Box 149a \ 2 scan0292 | |
| To Roy requesting an order for one 52 m.m. Mark VI block radiator matrix from Messrs. John Marston Ltd. | 20th Dec 1935 | Box 149a \ 2 scan0293 | |
| Letter to John Marston & Co. Ltd. regarding the weights, prices, and ordering of radiator matrices for a 20/25 HP car. | 20th Dec 1935 | Box 149a \ 2 scan0294 | |
| Letter from radiator specialists Gallay Ltd. concerning the performance and specifications of a new Bentley radiator block. | 23th Dec 1935 | Box 149a \ 2 scan0295 | |
| Letter from Gallay Ltd. concerning the progress on an oil cooler and a quotation for Gallay blocks. | 23th Dec 1935 | Box 149a \ 2 scan0296 | |
| Performance comparison graph of different radiator core types, plotting HP dissipated and air pressure drop against air flow. | 1st Apr 1914 | Box 149a \ 2 scan0297 | |
| Performance graph and specifications for a Norris Strip type radiator with tinned copper gilled seamed oval tubes. | 23th Dec 1935 | Box 149a \ 2 scan0298 | |
| Graph of radiator performance, plotting heat dissipation against water flow at different air speeds. | 23th Dec 1935 | Box 149a \ 2 scan0299 | |
| Graph comparing the water flow characteristics of Harrison and Gallay radiator blocks. | 23th Dec 1935 | Box 149a \ 2 scan0300 | |
| Chart detailing the performance of Ethylene Glycol coolant in a 2-row staggered tube system. | 11th Feb 1931 | Box 149a \ 2 scan0301 | |
| Performance chart for an ethylene glycol cooling system, plotting air pressure and horsepower dissipated against air flow. | 20th Feb 1935 | Box 149a \ 2 scan0302 | |
| Chart showing the density of various liquids at different temperatures. | 28th Dec 1931 | Box 149a \ 2 scan0303 | |
| Chart from an Ethylene Glycol trial comparing fluid flow against pressure difference for Ethylene, Oil, and Water. | 28th Dec 1931 | Box 149a \ 2 scan0304 | |
| Chart showing the relation between pressure differential across an element, liquid velocity, and temperature for various fluids. | 1st Nov 1930 | Box 149a \ 2 scan0305 | |
| Chart showing the rate of heat transmission from liquid to metal for different fluids and tube sizes. | 1st Nov 1930 | Box 149a \ 2 scan0306 | |
| Chart showing the effect of turbulence on air outlet temperatures for different fluids. | 23th Aug 1935 | Box 149a \ 2 scan0307 | |
| Graph showing oil cooling dissipation and pressure drop for a specific tube configuration in a free air stream. | 23th Aug 1935 | Box 149a \ 2 scan0308 | |
| Performance chart for a 3-tube type oil cooler, showing heat dissipation and pressure drop against flow rates. | 23th Aug 1935 | Box 149a \ 2 scan0309 | |
| Chart showing the variation of oil pressure with oil flow and temperature for a Buick oil cooler. | 1st Dec 1933 | Box 149a \ 2 scan0310 | |
| Performance chart for a Buick oil cooler, showing oil to water heat transmission characteristics. | 1st Dec 1933 | Box 149a \ 2 scan0311 | |
| Performance chart for a Buick oil cooler showing oil to water heat transmission. | 1st Feb 1933 | Box 149a \ 2 scan0312 | |
| Blueprint chart and data detailing oil to water heat transmission for a Buick honeycomb film oil cooler. | 1st Mar 1930 | Box 149a \ 2 scan0313 | |
| Blueprint chart and data for a Buick oil cooler, detailing oil to water heat transmission. | 4th Dec 1933 | Box 149a \ 2 scan0314 | |
| Performance chart for a Buick oil cooler, comparing heat transmission against water flow. | 4th Dec 1933 | Box 149a \ 2 scan0315 | |
| Chart comparing the performance of a Buick oil cooler against a calculated hexagonal honeycomb film type cooler. | 4th Dec 1933 | Box 149a \ 2 scan0316 | |
| Performance graph for an oil cooler showing heat dissipation and pressure drop against varying oil and air flows. | 23th Aug 1935 | Box 149a \ 2 scan0317 | |
| Chart showing dissipation and pressure characteristics for oil cooling tube H (016). | 23th Aug 1935 | Box 149a \ 2 scan0318 | |
| Letter from John Marston Ltd regarding a postponed visit and enclosing test results for radiator core matrices. | 24th Dec 1935 | Box 149a \ 2 scan0319 | |
| Letter from John Marston Limited discussing the comparative weights, prices, and manufacturing details of various matrices. | 24th Dec 1935 | Box 149a \ 2 scan0320 | |
| Letter to Gallay Limited concerning the testing of a Bentley radiator matrix. | 30th Dec 1935 | Box 149a \ 2 scan0321 | |
| Letter to John Marston Ltd. regarding the price and technical specifications of radiator matrices. | 31th Dec 1935 | Box 149a \ 2 scan0322 | |
| Letter from Gallay Ltd. enclosing heat dissipation figures and advising that an Oil Cooler is being despatched. | 31th Dec 1935 | Box 149a \ 2 scan0323 | |
| Letter from Gallay Ltd. confirming the dispatch of Oil Cooler and Heat Dissipation figures, and offering a sample core for testing. | 6th Jan 1936 | Box 149a \ 2 scan0324 | |
| Letter to Messrs Gallay Ltd. concerning a sample block for testing. | 8th Jan 1936 | Box 149a \ 2 scan0325 | |
| Request to send an official order for a radiator matrix that was previously ordered by telephone from Messrs Marston. | 9th Jan 1936 | Box 149a \ 2 scan0326 | |
| Letter to John Marston & Co. Ltd. regarding an official order for a 58 m.m. Mk. VI matrix with specific improvements. | 9th Jan 1936 | Box 149a \ 2 scan0327 | |
| Analysis of the effect of altitude on critical air temperature and engine boiling point. | 10th Jan 1936 | Box 149a \ 2 scan0328 | |
| Page of formulas and definitions for calculating engine heat loss and cooling performance, comparing sea level and altitude conditions. | 15th Jan 1936 | Box 149a \ 2 scan0329 | |
| Mathematical formulas for calculating temperature and density ratios at altitude. | 13th Jan 1936 | Box 149a \ 2 scan0330 | |
| Mathematical formulas and summary concerning radiator performance at various altitudes. | 7th Jan 1936 | Box 149a \ 2 scan0331 | |
| Graph of altitude corrected critical air temperatures for three radiators from altitudes of 0 to 10,000 feet. | 7th Jan 1936 | Box 149a \ 2 scan0332 | |
| Graph showing the variation of boiling point of water, air temperature, relative air density, and power factor with altitude. | 9th Jan 1936 | Box 149a \ 2 scan0333 | |
| Letter from The British Thermostat Co. Ltd. to Mr. C.S. Steadman regarding omitted charts and the lack of a test on a Gallay Radiator. | 9th Jan 1936 | Box 149a \ 2 scan0334 | |
| List of chart and drawing numbers for various engine components and systems. | 10th Jan 1936 | Box 149a \ 2 scan0335 | |
| Letter from John Marston Ltd. regarding the material specifications and completion of a 58mm Mark VI Matrix. | 10th Jan 1936 | Box 149a \ 2 scan0336 | |
| Letter to John Marston Ltd. regarding an analysis of altitude effects, cost estimations, and a request for a radiator matrix test block. | 14th Jan 1936 | Box 149a \ 2 scan0337 | |
| Letter from John Marston Limited acknowledging receipt of correspondence and advising that Mr. Southall is away. | 16th Jan 1936 | Box 149a \ 2 scan0338 | |
| Letter from John Marston Ltd. discussing radiator matrix analysis, weights, and production for tests. | 17th Jan 1936 | Box 149a \ 2 scan0339 | |
| Letter from John Marston Limited discussing the deferral of tests until a machine is ready. | 17th Jan 1936 | Box 149a \ 2 scan0340 | |
| Dispatch of four Bentley radiator cores for testing at Messrs Clayton Dewandre Ltd. | 17th Jan 1936 | Box 149a \ 2 scan0341 | |
| Letter to John Marston & Co. Ltd regarding the deferral of a Mark VI block test and a request for radiator block weights. | 21th Jan 1936 | Box 149a \ 2 scan0342 | |
| Letter to John Marston & Co. Ltd. regarding the testing and weights of Mark V and Mark VI radiator blocks. | 22th Jan 1936 | Box 149a \ 2 scan0343 | |
| Correspondence regarding the testing of a Mark VI Matrix, including an enclosed schedule of weights and notes on production variations. | 23th Jan 1936 | Box 149a \ 2 scan0344 | |
| Letter from John Marston Limited listing the weights of test radiator cores. | 23th Jan 1936 | Box 149a \ 2 scan0345 | |
| Letter from The British Thermostat Co. Ltd. to C.S. Steadman clarifying a discrepancy in heat dissipation calculations between two charts. | 5th Feb 1936 | Box 149a \ 2 scan0346 | |
| Letter from The British Thermostat Company Ltd. discussing further trial results on a Vauxhall Radiator's performance. | 1st Feb 1936 | Box 149a \ 2 scan0347 | |
| Report on preliminary tests comparing the performance of certain radiator centres. | 1st Feb 1936 | Box 149a \ 2 scan0348 | |
| Summary report on preliminary tests comparing the performance of various radiator cores. | 9th Nov 1935 | Box 149a \ 2 scan0349 | |
| The arrangements for testing radiators and a list of the specific radiators tested. | 1st Apr 1935 | Box 149a \ 2 scan0350 | |
| Radiator core types, surface area analysis, and testing parameters. | 1st Apr 1935 | Box 149a \ 2 scan0351 | |
| Comparison of various radiator core performances and deductions based on test curves. | 1st Apr 1935 | Box 149a \ 2 scan0352 | |
| Comparative analysis of radiator core performance, robustness, and manufacturing costs. | 1st Apr 1935 | Box 149a \ 2 scan0353 | |
| Comparison of Marston, Excelsior, and Morris radiator cores based on heat dissipation and cost. | 15th Feb 1936 | Box 149a \ 2 scan0354 | |
| Graph showing the performance characteristics of a Bentley Radiator Block (Harrison). | 15th Feb 1936 | Box 149a \ 2 scan0355 | |
| Performance graph for a Bentley Radiator (Harrison Block) showing HP dissipated and water pressure against water flow. | 15th Feb 1936 | Box 149a \ 2 scan0356 | |
| Performance graph for a Bentley Marston Mk. VI block radiator. | 15th Feb 1936 | Box 149a \ 2 scan0357 | |
| Performance graph for a Bentley Radiator (Marston Mk VI Block), plotting HP dissipated and water pressure against water flow. | 17th Feb 1936 | Box 149a \ 2 scan0358 | |
| Letter from Clayton Dewandre Company detailing the test results for Harrison and Marston engine blocks. | 17th Feb 1936 | Box 149a \ 2 scan0359 | |
| Invoice from John Marston Ltd. for a Mark Vl Copper Matrix and seeking payment approval. | 24th Feb 1936 | Box 149a \ 2 scan0360 | |
| Letter from Gallay Ltd. confirming the dispatch of a test radiator and seeking to quote for radiator blocks. | 24th Feb 1936 | Box 149a \ 2 scan0361 | |
| Blueprint of a 1934 type non-erodible radiator showing interlocked radiation gills, fins and flat tubes. | 26th Feb 1936 | Box 149a \ 2 scan0362 | |
| Letter from Clayton Dewandre Company Ltd. enclosing charts for radiators and advising on a testing delay for oil coolers. | 26th Feb 1936 | Box 149a \ 2 scan0363 | |
| Performance graph for a Bentley Radiator (Marston Mark V). | 28th Feb 1936 | Box 149a \ 2 scan0364 | |
| Performance chart for a Bentley Radiator (Marston Mark V). | 21th Feb 1936 | Box 149a \ 2 scan0365 | |
| Performance graph for a Bentley Gallay 3-row block radiator, showing HP dissipated and air pressure against air flow. | 25th Feb 1936 | Box 149a \ 2 scan0366 | |
| Performance graph for a Bentley Radiator (Gallay 3 Row Block), showing HP dissipated and water pressure against water flow. | 25th Feb 1936 | Box 149a \ 2 scan0367 | |
| Requesting a retrospective covering order for a Bentley Mark VI radiator matrix from John Marston Ltd. | 27th Feb 1936 | Box 149a \ 2 scan0368 | |
| The despatch of a Chausson Gallay radiator matrix test block for testing in New York. | 2nd Mar 1936 | Box 149a \ 2 scan0369 | |
| Letter to Gallay Ltd. requesting a price quote for Bentley and 20/25 radiator matrices with specific dimensions. | 2nd Mar 1936 | Box 149a \ 2 scan0370 | |
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