| Description | Date | Identifier | |
| Graph plotting RPM against British Thermal Units per minute transferred to oil and oil flow through bearings for a Bentley Unit C.10. | 16th Jun 1933 | Box 131 \ 1 scan0111 | |
| Graph plotting heat radiated by the crankcase against inlet temperature at a constant speed. | 16th Jun 1933 | Box 131 \ 1 scan0112 | |
| Further tests conducted on a Peregrine engine to reduce heat transfer to the oil. | 16th Jun 1933 | Box 131 \ 1 scan0113 | |
| Modifying the J.III timing case into an oil cooler and comparing it to the Bentley and Peregrine engines. | 16th Jun 1933 | Box 131 \ 1 scan0114 | |
| Test data for Bentley Unit C.10, detailing oil heat and flow rates at various RPMs. | 16th Jun 1933 | Box 131 \ 1 scan0115 | |
| Test results for heat flow to oil in a Peregrine Unit No. 2, investigating lead bronze bearing metal and comparing standard vs. pinned sumps. | 16th Jun 1933 | Box 131 \ 1 scan0116 | |
| Graph plotting British Thermal Units per minute against RPM for different oil system configurations. | 16th Jun 1933 | Box 131 \ 1 scan0117 | |
| Graph plotting heat transfer to oil against RPM for various oil release and sump configurations. | 16th Jun 1933 | Box 131 \ 1 scan0118 | |
| Graph showing the relationship between R.P.M., oil flow, and B.T.U.s per minute to oil for a Bentley Unit C.10. | 16th Jun 1933 | Box 131 \ 1 scan0119 | |
| Graph plotting heat radiated by the crankcase against inlet temperature at a constant speed of 3500 R.P.M. | 16th Jun 1933 | Box 131 \ 1 scan0120 | |
| Relative merits and designs of water-based and air-based oil coolers for various engines. | 16th Jun 1933 | Box 131 \ 1 scan0121 | |
| Reverting to a proven crankshaft lubrication system and incorporating a Buick-type cooler in a revised design. | 16th Jun 1933 | Box 131 \ 1 scan0122 | |
| Required modifications for a test bed oil cooler, Ex.11426. | 3rd Jul 1933 | Box 131 \ 1 scan0123 | |
| Confirming the absence of General Motors patents for a Buick water-cooled oil cooler in England. | 4th Jul 1933 | Box 131 \ 1 scan0124 | |
| Request to run comparative tests on the cooling and restriction properties of Spectre and Buick oil temperature regulators. | 18th Mar 1935 | Box 131 \ 1 scan0125 | |
| Bentley heat balance experiments, detailing the unit specifications and testing methodology. | 13th Feb 1934 | Box 131 \ 1 scan0126 | |
| Engine heat transfer analysis, focusing on heat absorbed by oil and cooling water. | 13th Feb 1934 | Box 131 \ 1 scan0127 | |
| Analysis of engine heat losses, piston friction, and mechanical efficiency at various RPMs. | 13th Feb 1934 | Box 131 \ 1 scan0128 | |
| Experiments comparing Aerolite and E.B.1299 pistons, and the effects of crankshaft balance weights on heat, friction, and engine performance. | 1st Jan 1934 | Box 131 \ 1 scan0129 | |
| Variations in engine power output due to piston skirt dimensions and outlining future tests. | 13th Feb 1934 | Box 131 \ 1 scan0130 | |
| Graph comparing the Mechanical Efficiency and Indicated Horsepower of Aerolite & E.B.1299 pistons against engine R.P.M. for unit B.6. | 1st May 1934 | Box 131 \ 1 scan0131 | |
| Performance comparison graph between Aerolite and E.B. 1299 pistons. | 2nd Dec 1934 | Box 131 \ 1 scan0132 | |
| Heat distribution diagram for a Bentley engine unit. | 18th Feb 1934 | Box 131 \ 1 scan0133 | |
| Results of pressure tests on Spectre and Buick oil coolers. | 6th Aug 1935 | Box 131 \ 1 scan0134 | |
| The performance comparison between original and modified oil cooler matrices for the Spectre Oil Temperature Regulator. | 22th Aug 1935 | Box 131 \ 1 scan0135 | |
| Summary of tests on a modified matrix, concluding the original design should be strengthened to withstand high oil pressures. | 22th Aug 1935 | Box 131 \ 1 scan0136 | |
| Request for performance data on two types of oil coolers, including cooling capacity, back pressure, and a strength comparison. | 20th Sep 1935 | Box 131 \ 1 scan0137 | |
| Requesting performance and strength data for Spectre oil coolers. | 20th Sep 1935 | Box 131 \ 1 scan0138 | |
| Request for two oil coolers to be used in the New Car Unit - Test House. | 19th Oct 1935 | Box 131 \ 1 scan0139 | |
| Requesting oil coolers for the completion of the oil system in the new car unit test house. | 5th Nov 1935 | Box 131 \ 1 scan0140 | |
| The pressure test failure of a Spectre Oil Cooler. | 2nd Nov 1935 | Box 131 \ 1 scan0141 | |
| Letter to The Clayton Dewandre Co. Ltd. regarding the reconsideration of oil coolers. | 8th Nov 1935 | Box 131 \ 1 scan0142 | |
| Tests comparing two types of Phantom III oil temperature regulators, LeC.3756 and LeC.4386. | 11th Nov 1935 | Box 131 \ 1 scan0143 | |
| Test results and conclusions for old and new type oil cooler matrices. | 11th Nov 1935 | Box 131 \ 1 scan0144 | |
| Quality of solder on the Spectre oil cooler and plans for further testing. | 11th Nov 1935 | Box 131 \ 1 scan0145 | |
| Comparison report on pressure and temperature tests conducted on Spectre and Buick oil coolers. | 11th Nov 1935 | Box 131 \ 1 scan0146 | |
| Letter from Clayton Dewandre Company Limited regarding the arrangement of a meeting. | 11th Nov 1935 | Box 131 \ 1 scan0147 | |
| Request to strip and rebuild a failed Ph.III oil cooler matrix using high-temperature solder. | 12th Nov 1935 | Box 131 \ 1 scan0148 | |
| Letter to The Clayton Dewandre Co. Ltd. arranging a meeting for Mr. Blomeley. | 13th Nov 1935 | Box 131 \ 1 scan0149 | |
| Letter from Clayton Dewandre Co. Ltd. arranging a convenient day for a visit. | 14th Nov 1935 | Box 131 \ 1 scan0150 | |
| Letter to Clayton Dewandre Co. Ltd. confirming a visit from Mr. Steadman. | 18th Nov 1935 | Box 131 \ 1 scan0151 | |
| Letter to Clayton Dewandre Ltd. detailing the supply of Bentley radiator cores for mutual testing. | 22th Nov 1935 | Box 131 \ 1 scan0152 | |
| Letter discussing cooling figures, a Buick cooler, and requesting a working model of a patent brake adjuster. | 22th Nov 1935 | Box 131 \ 1 scan0153 | |
| The limiting conditions for the operation of the oil cooler on the Phantom III Engine. | 22th Nov 1935 | Box 131 \ 1 scan0154 | |
| Letter from Clayton Dewandre Co. Ltd. concerning trial radiator cores, oil coolers, and a Patent Brake Adjuster demonstration. | 25th Nov 1935 | Box 131 \ 1 scan0155 | |
| Letter to Clayton Dewandre Co. Ltd. regarding a Patent Brake Adjuster and arranging an inspection. | 29th Nov 1935 | Box 131 \ 1 scan0156 | |
| Letter from Clayton Dewandre Co. Ltd. arranging for Mr. Day to inspect a sample adjuster after Christmas. | 2nd Dec 1935 | Box 131 \ 1 scan0157 | |
| Disappointing progress and failures of the Phantom III Oil Cooler designs. | 7th Dec 1935 | Box 131 \ 1 scan0158 | |
| Examination of a Buick cooler and its by-pass safety valve. | 7th Dec 1935 | Box 131 \ 1 scan0159 | |
| Summary of comparative and pressure tests carried out on oil coolers in connection with Ph.III. | 7th Dec 1935 | Box 131 \ 1 scan0160 | |
| Cooler test results, comparing Ph.III and Buick models, and providing design conclusions. | 7th Dec 1935 | Box 131 \ 1 scan0161 | |
| Blueprint diagram illustrating the oil flow through a pump system at different operating temperatures. | 20th Dec 1935 | Box 131 \ 1 scan0162 | |
| Despatch of a Ph.III Oil Cooler Unit to Clayton Dewandre Ltd. for experimental modification. | 20th Dec 1935 | Box 131 \ 1 scan0163 | |
| Letter to Clayton Dewandre Ltd. regarding the status of experimental oil coolers and Bentley water radiator cores. | 20th Dec 1935 | Box 131 \ 1 scan0164 | |
| Failure, rebuild, and testing of a Ph.111 oil cooler block. | 21th Dec 1935 | Box 131 \ 1 scan0165 | |
| Letter from Clayton Dewandre Company Limited regarding a cooler delivery with missing parts. | 31th Dec 1935 | Box 131 \ 1 scan0166 | |
| Arranging for oil cooler tests to be carried out by Messrs Clayton. | 1st Jan 1936 | Box 131 \ 1 scan0167 | |
| Letter to Clayton Dewandre Ltd. regarding arrangements for a cooler cover and a patent brake adjuster inspection. | 2nd Jan 1936 | Box 131 \ 1 scan0168 | |
| Letter from Clayton Dewandre Co. Ltd. arranging a demonstration of a patent brake adjuster model. | 3rd Jan 1936 | Box 131 \ 1 scan0169 | |
| Letter to Messrs Clayton Dewandre Ltd. regarding the forwarding and testing of radiator cores. | 17th Jan 1936 | Box 131 \ 1 scan0170 | |
| Letter from Clayton Dewandre Company Limited acknowledging the receipt of four radiator cores for testing. | 20th Jan 1936 | Box 131 \ 1 scan0171 | |
| Instructions to despatch two Ph.III Oil Temperature Regulators to Messrs. Clayton Dewandre Ltd. | 7th Feb 1936 | Box 131 \ 1 scan0172 | |
| Letter to Clayton Dewandre, Ltd. regarding delays and instructions for pressure testing various oil cooler blocks. | 7th Feb 1936 | Box 131 \ 1 scan0173 | |
| The concluding page of a business letter. | 7th Feb 1936 | Box 131 \ 1 scan0174 | |
| Letter from Clayton Dewandre Co. Ltd. confirming receipt of cooler parts and the commencement of trials. | 11th Feb 1936 | Box 131 \ 1 scan0175 | |
| Letter from Gallay Ltd. inquiring about the tests on an experimental oil cooler. | 19th Feb 1936 | Box 131 \ 1 scan0176 | |
| Letter to Gallay Ltd. requesting a price quote for Bentley and 20/25 radiator matrices. | 2nd Mar 1936 | Box 131 \ 1 scan0177 | |
| Letter discussing the results of radiator test charts and arranging further tests on Mark V and Mark VI blocks. | 4th Mar 1936 | Box 131 \ 1 scan0178 | |
| Letter to Buick inquiring about rumoured problems with a Viscon type oil cooler. | 11th Mar 1936 | Box 131 \ 1 scan0179 | |
| Inquiry to Lendrum & Hartman Ltd. regarding the performance and reliability of Buick tubular oil coolers. | 11th Mar 1936 | Box 131 \ 1 scan0180 | |
| Letter from car concessionaire Lendrum & Hartman Ltd. concerning the performance and maintenance of the Buick Oil Temperature Regulator. | 13th Mar 1936 | Box 131 \ 1 scan0181 | |
| Letter from Lendrum & Hartman Limited providing instructions for cleaning Oil Temperature Regulators. | 13th Mar 1936 | Box 131 \ 1 scan0182 | |
| Letter of thanks to Lendrum & Hartman Ltd. for information regarding an Oil Cooler. | 14th Mar 1936 | Box 131 \ 1 scan0183 | |
| Test report on the failure of a Ph.III Cil Temperature Regulator under increasing oil pressure. | 16th Mar 1930 | Box 131 \ 1 scan0184 | |
| Recommendation to standardize a production scheme after successful testing of 15,000 miles. | 16th Mar 1936 | Box 131 \ 1 scan0185 | |
| Letter from Buick Motor Company regarding the life and cooling efficiency of viscon type oil coolers. | 31th Mar 1936 | Box 131 \ 1 scan0186 | |
| Efficiency chart for an oil temperature regulator, experiment number 6324. | 6th Nov 1931 | Box 131 \ 1 scan0187 | |
| Shop manual page describing the lubrication system, oil specifications, and oil temperature regulator for 1934 Buick models. | 1st Jan 1934 | Box 131 \ 1 scan0188 | |
| Page from a 1934 Buick shop manual detailing the components, operation, and maintenance of the oil temperature regulator. | 1st Jan 1934 | Box 131 \ 1 scan0189 | |
| Instructions for the removal, cleaning, and disassembly of an oil temperature regulator. | 1st Jan 1934 | Box 131 \ 1 scan0190 | |
| Page from a 1934 Buick shop manual detailing the disassembly of a regulator body. | 1st Jan 1934 | Box 131 \ 1 scan0191 | |
| Letter to Clayton Dewandre Ltd. regarding a received car heater and a request for oil cooler test results. | 3rd Apr 1936 | Box 131 \ 1 scan0192 | |
| Incorrect delivery of a Harrison Twin Flow Master car heater and its redirection. | 7th Apr 1936 | Box 131 \ 1 scan0193 | |
| Leaking Oil Cooler Assemblies from supplier J. Marston Ltd. | 30th May 1936 | Box 131 \ 1 scan0194 | |
| Letter requesting the expedition of oil cooler test results, mentioning a new American cooler for future comparative testing. | 10th Jun 1936 | Box 131 \ 1 scan0195 | |
| Letter to John Marston & Co. Ltd. regarding cooler testing and the soldering mixture specification. | 11th Jun 1936 | Box 131 \ 1 scan0196 | |
| Letter from Clayton Dewandre regarding rigging up apparatus for oil cooler tests. | 11th Jun 1936 | Box 131 \ 1 scan0197 | |
| Letter to Messrs. Clayton Dewandre Ltd. regarding a delay in receiving an American cooler, which prevents testing. | 12th Jun 1936 | Box 131 \ 1 scan0198 | |
| Letter from John Marston Ltd. regarding the solder used on Oil Cooler No. E.87820. | 23th Jun 1936 | Box 131 \ 1 scan0199 | |
| Despatch of a Phantom III Oil Cooler to Messrs. John Marston & Co. Ltd. for repair. | 26th Jun 1936 | Box 131 \ 1 scan0200 | |
| Letter to supplier John Marston & Co. Ltd. regarding a faulty Ph.III oil cooler that failed an endurance test. | 26th Jun 1936 | Box 131 \ 1 scan0201 | |
| Letter from John Marston Ltd regarding the testing and potential fracturing of an oil cooler joint. | 29th Jun 1936 | Box 131 \ 1 scan0202 | |
| Letter from John Marston Ltd regarding high-temperature solder experiments for cooler manufacturing. | 3rd Jul 1936 | Box 131 \ 1 scan0203 | |
| Correspondence from John Marston Limited regarding experiments and use of high-temperature solder for manufacturing coolers. | 3rd Jul 1936 | Box 131 \ 1 scan0204 | |
| Letter from supplier John Marston Limited regarding the quality of Oil Coolers and preventative measures for future batches. | 18th Jun 1936 | Box 131 \ 1 scan0205 | |
| Letter to John Marston Ltd regarding a disagreement over solder type for Ph.III oil coolers. | 7th Jul 1936 | Box 131 \ 1 scan0206 | |
| Letter from John Marston Ltd regarding the production and soldering of Phantom III Oil Coolers. | 10th Jul 1936 | Box 131 \ 1 scan0207 | |
| Letter to Clayton Deandre Ltd. chasing promised oil cooler test results. | 6th Aug 1936 | Box 131 \ 1 scan0208 | |
| Letter from Clayton Dewandre Co. Ltd. regarding a delay in analysing oil cooler test results. | 7th Aug 1936 | Box 131 \ 1 scan0209 | |
| Letter from Clayton Dewandre Company Ltd. reporting on the results of oil cooler trials for the Phantom III engine. | 18th Aug 1936 | Box 131 \ 1 scan0210 | |
| | | | |
