| Description | Date | Identifier | |
| Request to obtain a standard Bentley radiator from production and forward it to Messrs. Clayton Dewandre Ltd. for testing. | 4th Mar 1936 | Box 149a \ 2 scan0371 | |
| Performance graph for a Chausson Gallay Fin & Tube radiator. | 13th Apr 1936 | Box 149a \ 2 scan0372 | |
| Letter to Clayton Dewandre Ltd. discussing radiator test results for Mark V and Mark VI blocks and arranging further tests. | 4th Mar 1936 | Box 149a \ 2 scan0373 | |
| Graph showing comparative tests carried out on Bentley radiator matrices. | 5th May 1938 | Box 149a \ 2 scan0374 | |
| Comparative performance graph of Harrison vs. Chausson-Gallay radiators. | 13th Jun 1936 | Box 149a \ 2 scan0375 | |
| Four graphs showing the relationship of airflow to heat dissipation, air temperature rise, static pressure, and theoretical air horsepower. | 6th Mar 1936 | Box 149a \ 2 scan0376 | |
| Letter from Clayton Dewandre discussing the relative performance of Marston and Harrison radiator blocks and oil coolers. | 6th Mar 1936 | Box 149a \ 2 scan0377 | |
| Letter to Clayton Dewandre Ltd. clarifying a misunderstanding over test results for different radiator core blocks. | 7th Mar 1936 | Box 149a \ 2 scan0378 | |
| Letter from Clayton Dewandre Company Limited acknowledging a previous letter and the dispatch of a new Mark V core for testing. | 9th Mar 1936 | Box 149a \ 2 scan0379 | |
| Quotation from Gallay Ltd. for the supply of radiator blocks, with a recommendation for a non-erodible type. | 17th Mar 1936 | Box 149a \ 2 scan0380 | |
| The special features of the Gallay Non-Erodible Radiator Core, Patent No. 398.110. | 30th Mar 1936 | Box 149a \ 2 scan0381 | |
| Letter to John Marston Ltd. inquiring about tests on Mark V and Mark VI matrices for the Phantom III car. | 30th Mar 1936 | Box 149a \ 2 scan0382 | |
| Letter from John Marston Limited regarding the progress of tests on Mark V and Mark VI matrices. | 1st Apr 1936 | Box 149a \ 2 scan0383 | |
| Comparison table of trial results for various components. | 7th Apr 1936 | Box 149a \ 2 scan0384 | |
| Comparison table of performance metrics for four different radiator block trials. | 7th Apr 1921 | Box 149a \ 2 scan0385 | |
| Graph plotting the temperature of air after passing through different radiator cores against air velocity. | 7th Apr 1921 | Box 149a \ 2 scan0386 | |
| Graph comparing the heat dissipation efficiency of various radiator types against air velocity. | 1st May 1936 | Box 149a \ 2 scan0387 | |
| Performance graph showing the estimated performance of two aftercooler cores with a 1/2 inch space between them. | 1st May 1936 | Box 149a \ 2 scan0388 | |
| Four graphs showing Heat Dissipation, Air Temperature Rise, Static Pressure, and Theoretical Air Horsepower against Air Flow. | 7th Apr 1936 | Box 149a \ 2 scan0389 | |
| Letter from John Marston Ltd discussing the enclosure of test graphs and the alteration of a Harrison radiator following a delay. | 7th Apr 1936 | Box 149a \ 2 scan0390 | |
| Letter from Clayton Dewandre Company regarding test results and comparison of a Bentley Harrison block. | 7th Apr 1936 | Box 149a \ 2 scan0391 | |
| Performance graph and specifications for a New Mark V Radiator. | 1st Jun 1941 | Box 149a \ 2 scan0392 | |
| Performance graph for the New Mark V Radiator, plotting HP dissipated and water pressure against water flow. | 24th Jan 1936 | Box 149a \ 2 scan0393 | |
| Directive to modify the radiator inlet and spring support for the American Model. | 22th May 1919 | Box 149a \ 3 scan0001 | |
| Decision to continue manufacturing standard right-hand drive chassis for America, while stopping all work on the proposed left-hand drive version. | 31th Oct 1919 | Box 149a \ 3 scan0002 | |
| Technical memo discussing temperature indicators, Dunlop and Rudge-Whitworth hubs, and petrol tank filler gauzes. | 2nd Dec 1919 | Box 149a \ 3 scan0003 | |
| Extract concerning the supply and specifications of extruded copper radiator tubes. | 30th Jan 1920 | Box 149a \ 3 scan0004 | |
| Continuation of a document requesting four radiators be built with specific tubes and tested. | 11th Feb 1920 | Box 149a \ 3 scan0005 | |
| Non-compliant radiator tubes received from America and recommending they adhere to the company's specifications. | 11th Feb 1920 | Box 149a \ 3 scan0006 | |
| Part standardisation, testing requirements over 10,000 miles, and the risks of pre-ordering materials. | 11th Feb 1920 | Box 149a \ 3 scan0007 | |
| Expressing concern over an American company's attitude towards the supply and testing of radiator tubes. | 22th May 1919 | Box 149a \ 3 scan0008 | |
| Copy of a telegram sent to Mr. Southern to stop the despatch of radiator tubes from America. | 12th Feb 1919 | Box 149a \ 3 scan0009 | |
| Rejection of 24,000 non-standard radiator tubes and the policy of adhering to standard materials for American-built chassis. | 1st Mar 1920 | Box 149a \ 3 scan0010 | |
| Radiator testing, the use of hexagon tubes, material preferences (brass vs. copper), and ordering parts in America. | 23th Mar 1920 | Box 149a \ 3 scan0011 | |
| Radiator tubes sourced from America and a discussion with Mr. Royce regarding their specifications. | 29th Mar 1920 | Box 149a \ 3 scan0012 | |
| Sample radiator tubes, relaying Mr. Royce's desire to avoid radical changes and follow existing practice. | 30th Mar 1920 | Box 149a \ 3 scan0013 | |
| Seeking a decision on whether to use radiator tubes from America for experimental radiators or return them. | 20th Apr 1920 | Box 149a \ 3 scan0014 | |
| From the U.S.A. Department seeking clarification on the handling of radiator tubes for America. | 20th Apr 1920 | Box 149a \ 3 scan0015 | |
| From Mr. Olley regarding the unsuitability of radiator blanking plates for American driving conditions, suggesting a leather cover as an alternative. | 23th Apr 1920 | Box 149a \ 3 scan0016 | |
| Query about developing adjustable radiator covers and blanking plates for hot climates like India, the United States, and Canada. | 23th Apr 1920 | Box 149a \ 3 scan0017 | |
| Potential improvements to be incorporated into the American-built car. | 21th May 1920 | Box 149a \ 3 scan0018 | |
| The adoption of thermostat control affecting the top water connections on the chassis. | 22th May 1920 | Box 149a \ 3 scan0019 | |
| Extract detailing the sourcing of various car parts for America. | 7th Jun 1920 | Box 149a \ 3 scan0020 | |
| Implementation of a new Thermostat Control system and a new short brake lever. | 21th Jun 1920 | Box 149a \ 3 scan0021 | |
| American Foxborough Thermometer, comparing its features to the standard instrument and debating its necessity when a thermostat is fitted. | 19th Jul 1920 | Box 149a \ 3 scan0022 | |
| The utility of a thermometer for preventing radiator freezing compared to fitting a thermostat. | 19th Jul 1920 | Box 149a \ 3 scan0023 | |
| Use of copper versus brass tubing in radiators for the U.S.A. to address corrosion from alkaline water. | 27th Jul 1920 | Box 149a \ 3 scan0024 | |
| Continued discussion regarding radiators with brass tubes and an investigation into using copper. | 27th Jul 1920 | Box 149a \ 3 scan0025 | |
| Usability of brass radiator tubes in America due to alkaline water and requesting tests. | 28th Jul 1920 | Box 149a \ 3 scan0026 | |
| Problems with collapsing copper radiator tubes and advocating for the continued use of brass tubes. | 29th Jul 1920 | Box 149a \ 3 scan0027 | |
| Possibility of alkaline water supply in the U.S.A. and its corrosive effects on radiators. | 29th Dec 1920 | Box 149a \ 3 scan0028 | |
| Test procedure involving Sodium Chloride and a discussion on water hardness treatment. | 24th Aug 1920 | Box 149a \ 3 scan0029 | |
| Laboratory report on corrosion tests of a brass tube using various water solutions. | 28th Jul 1920 | Box 149a \ 3 scan0030 | |
| Laboratory report on corrosion tests for radiator tubes, comparing different metal compositions and their resistance to various solutions. | 11th Aug 1920 | Box 149a \ 3 scan0031 | |
| Continuation page of a report regarding an issue with water. | 11th Aug 1920 | Box 149a \ 3 scan0032 | |
| Request for a report regarding suggested design changes for Radiator Tubes, mort No.6. | 11th Aug 1920 | Box 149a \ 3 scan0033 | |
| Letter regarding suggested design changes for radiator tubes, detailing issues with brass tubes in the US and sourcing difficulties. | 27th Jul 1920 | Box 149a \ 3 scan0034 | |
| Radiator tube manufacturing methods and the viability of brass radiators in the United States. | 27th Jul 1920 | Box 149a \ 3 scan0035 | |
| Conclusion of a letter discussing experiments with copper tubes and the potential for breakdown from alkaline water. | 12th Aug 1920 | Box 149a \ 3 scan0036 | |
| Unsatisfactory radiator tubes from the American facility and the subsequent cable sent to address the issue. | 12th Aug 1920 | Box 149a \ 3 scan0037 | |
| Use of copper versus brass tubes for radiators and issues with American-supplied tubes. | 1st Aug 1920 | Box 149a \ 3 scan0038 | |
| Lack of complaints from America about brass tube failures and a request for specifications from Springfield. | 12th Aug 1920 | Box 149a \ 3 scan0039 | |
| Laboratory report on corrosion tests on radiators using hard water and various chemical solutions. | 28th Jul 1920 | Box 149a \ 3 scan0040 | |
| Laboratory report on corrosion tests for radiator tubes, comparing different copper and brass compositions. | 11th Aug 1920 | Box 149a \ 3 scan0041 | |
| Extract discussing the supply of thermostats and thermometers for chassis production in America. | 27th Aug 1920 | Box 149a \ 3 scan0042 | |
| The decision to no longer fit thermometers as a standard feature when thermostats are installed. | 9th Sep 1920 | Box 149a \ 3 scan0043 | |
| Extract from a report on an American visit discussing component issues and suggestions for improvement. | 11th Nov 1920 | Box 149a \ 3 scan0044 | |
| Report discussing petrol system experience, spring shackle clearances, and radiator material. | 11th Nov 1920 | Box 149a \ 3 scan0045 | |
| Radiator Tubes and an attached letter from America. | 24th Mar 1921 | Box 149a \ 3 scan0046 | |
| Letter regarding an advertisement for Extruded Copper Radiator Tubes and their lifetime guarantee. | 11th Mar 1921 | Box 149a \ 3 scan0047 | |
| Suggesting an investigation into using cheaper American-made extruded copper radiator tubes. | 24th Mar 1921 | Box 149a \ 3 scan0048 | |
| Use of extruded copper tubes for radiators as a cheaper alternative to brass tubes. | 11th Apr 1921 | Box 149a \ 3 scan0049 | |
| Supply and cost comparison of extruded copper tubes for radiators. | 4th Apr 1921 | Box 149a \ 3 scan0050 | |
| Policy for fitting thermostats to American and European cars, comparing different systems and preferences. | 25th Apr 1921 | Box 149a \ 3 scan0051 | |
| Internal memorandum forwarding a letter regarding radiator tubes. | 20th May 1921 | Box 149a \ 3 scan0052 | |
| Letter from Rolls-Royce of America to London regarding an order for extruded copper radiator tubes for testing. | 4th May 1921 | Box 149a \ 3 scan0053 | |
| Engine performance issues due to low-grade fuel and extremely cold winters, with a proposal for thermostatically operated louvres. | 8th Jun 1921 | Box 149a \ 3 scan0054 | |
| Engine modifications, including carburetter position, induction system design, and heat application. | 8th Jun 1921 | Box 149a \ 3 scan0055 | |
| Engine starting difficulties and a proposed solution involving an additional small carburettor. | 8th Jun 1921 | Box 149a \ 3 scan0056 | |
| Typed document discussing a required design change for the new 20 HP chassis. | 8th Jun 1921 | Box 149a \ 3 scan0057 | |
| The cost and manufacturing process of extruded copper radiator tubes. | 8th Aug 1921 | Box 149a \ 3 scan0058 | |
| Testing, cost, and potential sourcing of extruded copper tubes for radiators. | 20th Aug 1921 | Box 149a \ 3 scan0059 | |
| Confirmation of a telegram arranging a meeting regarding modifications for the USA winter programme. | 10th Oct 1921 | Box 149a \ 3 scan0060 | |
| Technical suggestions and agreements for winter starting in America. | 14th Nov 1921 | Box 149a \ 3 scan0061 | |
| Letter from the Springfield factory discussing radiator matrix and tube designs and performance. | 27th Feb 1923 | Box 149a \ 3 scan0062 | |
| Page 2 of a memorandum advising on the adoption of the U.S. Cartridge matrix and soldering techniques. | 31th Aug 1923 | Box 149a \ 3 scan0063 | |
| Cover memo attaching a letter from Springfield regarding a radiator support. | 31th Aug 1923 | Box 149a \ 3 scan0064 | |
| Letter regarding radiator support issues causing hammering, with suggestions for improvement. | 14th Aug 1925 | Box 149a \ 3 scan0065 | |
| Letter discussing the change to using pure nickel sheets for radiators to improve performance in tropical climates. | 24th May 1927 | Box 149a \ 3 scan0066 | |
| Various metal finishes for car parts, comparing nickel, chromium plating, and rustless steel. | 24th May 1927 | Box 149a \ 3 scan0067 | |
| Letter discussing the pros and cons of using chromium plating and 'Staybrite' material for car radiators. | 10th Jun 1927 | Box 149a \ 3 scan0068 | |
| The performance of a radiator material being tested by Messrs Firths. | 10th Jun 1927 | Box 149a \ 3 scan0069 | |
| Letter from Rolls-Royce of America to the UK discussing a potential improvement in radiator design for quicker warming. | 28th Nov 1927 | Box 149a \ 3 scan0070 | |
| Letter from E. T. Curran proposing a radiator partition design to prevent motor overcooling, complete with a cutaway illustration. | 1st Dec 1927 | Box 149a \ 3 scan0071 | |
| Cable requesting a drawing for the American Phantom one radiator tube. | 25th Sep 1930 | Box 149a \ 3 scan0072 | |
| Letter from the Springfield, Mass. office to Derby, England, regarding radiator tubes. | 26th Sep 1930 | Box 149a \ 3 scan0073 | |
| Letter from Winchester Repeating Arms Company quoting prices for various radiator tubes. | 8th Dec 1930 | Box 149a \ 3 scan0074 | |
| Page 2 of a letter from Winchester Repeating Arms Company confirming two sets of samples are being sent to Mr. Hives. | 3rd Feb 1931 | Box 149a \ 3 scan0075 | |
| Requesting an update on the progress of making and testing a radiator with tubes sent from America. | 3rd Feb 1931 | Box 149a \ 3 scan0076 | |
| Arrangement of wind tunnel tests for new radiators with U.S.A. tubes. | 17th Feb 1931 | Box 149a \ 3 scan0077 | |
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