| Description | Date | Identifier | |
| Request to order various sizes of rubber hose from two different suppliers. | 29th Feb 1940 | Box 150 \ 2 scan0320 | |
| Letter from S. Smith & Sons regarding the provision of two Air Conditioners for test purposes, discussing radiator design and efficiency. | 1st Mar 1940 | Box 150 \ 2 scan0321 | |
| From Rm. to Ev. regarding the rationalisation and standardisation of radiator mountings. | 2nd Mar 1940 | Box 150 \ 2 scan0322 | |
| Letter from S. Smith & Sons regarding a joint patent application for a thermostatically controlled pressure relief valve. | 7th Mar 1940 | Box 150 \ 2 scan0323 | |
| Programme of cooling tests for radiators and shutters. | 9th Mar 1940 | Box 150 \ 2 scan0324 | |
| List of continued tests to be carried out on defrosting, bonnets, and dashboards. | 9th Mar 1940 | Box 150 \ 2 scan0325 | |
| Letter to S. Smith & Sons regarding the patenting of a thermostatically controlled pressure relief valve. | 11th Mar 1940 | Box 150 \ 2 scan0326 | |
| Short communication to Radiator Oxford proposing a visit on a Tuesday. | 11th Mar 1940 | Box 150 \ 2 scan0327 | |
| Letter regarding the dispatch of a Phantom III radiator previously sent in error. | 13th Mar 1940 | Box 150 \ 2 scan0328 | |
| Visit to various firms regarding the development and production of car heater components. | 13th Mar 1940 | Box 150 \ 2 scan0329 | |
| Continued report on radiator modifications and discussions with AMAL LTD. regarding bonnet fasteners. | 13th Mar 1940 | Box 150 \ 2 scan0330 | |
| Visit to Hallam, Sleigh & Cheston Ltd. to discuss car heater designs and proposals. | 13th Mar 1940 | Box 150 \ 2 scan0331 | |
| Visit to Morris Radiators Ltd. to discuss the manufacture and performance of a Bentley V radiator. | 13th Mar 1940 | Box 150 \ 2 scan0332 | |
| Report discussing radiator costs, designs including chromium plating, and comparisons with competitors. | 13th Mar 1940 | Box 150 \ 2 scan0333 | |
| Letter to Morris Motors (Radiator Division) confirming a visit to discuss an experimental Bentley V radiator. | 14th Mar 1940 | Box 150 \ 2 scan0334 | |
| Review of radiator mountings on various models and a proposal for a new scheme to address issues with sideways shake. | 14th Mar 1940 | Box 150 \ 2 scan0335 | |
| Brief memo confirming no new schemes for straight front pan cars as they are not in the product range. | 14th Mar 1940 | Box 150 \ 2 scan0336 | |
| Visit to Morris Radiators and the strategy for developing car heaters. | 14th Mar 1940 | Box 150 \ 2 scan0337 | |
| The submission of an undershield to the Detail Drawing Office for detailing. | 18th Mar 1940 | Box 150 \ 2 scan0338 | |
| Visit to Morris Radiators, detailing ongoing heater development and potential parts collaboration. | 19th Mar 1940 | Box 150 \ 2 scan0339 | |
| Requesting a change in a car's shutter angle for testing and the preparation of additional top strips for future tests. | 21th Mar 1940 | Box 150 \ 2 scan0340 | |
| Proposal for a series of cooling tests on car model Ripple 1.R.1, detailing various fan and radiator shutter configurations. | 21th Mar 1940 | Box 150 \ 2 scan0341 | |
| Letter to Morris Radiators Ltd. regarding Bentley V radiators, enclosing drawing RE.583 for immediate production. | 21th Mar 1940 | Box 150 \ 2 scan0342 | |
| Letter from Morris Motors acknowledging receipt of drawing RE.583 and confirming a sample radiator will be made. | 28th Mar 1940 | Box 150 \ 2 scan0343 | |
| The dispatch of blueprints and parts for a Ripplet Radiator. | 29th Mar 1940 | Box 150 \ 2 scan0344 | |
| With a query and a subsequent instruction to make a phone call. | 1st Apr 1940 | Box 150 \ 2 scan0345 | |
| Letter from The Searle Radiator Company Ltd. responding to order no. 17517 and requesting clarification on seven technical points. | 1st Apr 1940 | Box 150 \ 2 scan0346 | |
| Letter to John Marston Ltd. regarding radiator cooling tests, heater progress, and a request for a cost analysis. | 3rd Apr 1940 | Box 150 \ 2 scan0347 | |
| Letter to The Searle Radiator Co. Ltd. providing a list of replies to enquiries about radiator assembly. | 5th Apr 1940 | Box 150 \ 2 scan0348 | |
| Page 2 of a letter discussing blueprint scaling and shrinkage allowance. | 5th Apr 1940 | Box 150 \ 2 scan0349 | |
| Letter to Morris Motors regarding the fabrication of an experimental chromium-plated radiator shell. | 5th Apr 1940 | Box 150 \ 2 scan0350 | |
| Continued letter requesting a cost estimate for a shell and comparative curves for radiator blocks. | 9th Apr 1940 | Box 150 \ 2 scan0351 | |
| Letter from Morris Motors Radiators Branch regarding a Bentley V Radiator and associated drawings. | 9th Apr 1940 | Box 150 \ 2 scan0352 | |
| Letter from Morris Motors acknowledging receipt of a letter and drawings, and advising of a delay in providing charts. | 10th Apr 1940 | Box 150 \ 2 scan0353 | |
| Letter from The Searle Radiator Company confirming the dispatch of two radiator units with their specifications. | 16th Apr 1940 | Box 150 \ 2 scan0354 | |
| Letter to Morris Motors Ltd. apologising for a delayed reply and updating on the status of drawing SK.538. | 18th Apr 1940 | Box 150 \ 2 scan0355 | |
| Letter from Clayton Dewandre Company Ltd. about the near completion and dispatch of test results. | 12th Apr 1940 | Box 150 \ 2 scan0356 | |
| Letter from Klaxon Limited regarding the release of a motor from testing. | 12th Apr 1940 | Box 150 \ 2 scan0357 | |
| Letter to The Searle Radiator Co. Ltd. requesting a price for radiators and related technical data. | 18th Apr 1940 | Box 150 \ 2 scan0358 | |
| Letter from The Searle Radiator Company Ltd. acknowledging an enquiry for 300 radiators. | 19th Apr 1940 | Box 150 \ 2 scan0359 | |
| Letter from Morris Motors Radiators Branch requesting clarification on the assembly of an experimental Radiator Shell. | 26th Apr 1940 | Box 150 \ 2 scan0360 | |
| Letter to Morris Motors Ltd. discussing amendments to a radiator drawing. | 27th Apr 1940 | Box 150 \ 2 scan0361 | |
| To place two orders with Messrs. John Marstons for a radiator conversion and a modified car heater unit. | 2nd May 1940 | Box 150 \ 2 scan0362 | |
| Letter to John Marstons Ltd. summarising current items in hand for radiators and heaters. | 2nd May 1940 | Box 150 \ 2 scan0363 | |
| Letter requesting cost comparisons for Mark III and Mark VI matrix blocks and alternative heater baffles. | 2nd May 1940 | Box 150 \ 2 scan0364 | |
| Overcoming low under-bonnet temperature on the 'Ripple' project by fitting a different radiator matrix. | 14th Jun 1940 | Box 150 \ 2 scan0365 | |
| Chasing the return of a G/F sheet and enquiring about a loaned B.50 mock-up unit. | 28th Jun 1940 | Box 150 \ 2 scan0366 | |
| Stating correspondence for a mock-up unit cannot be traced as the job is considered dead. | 5th Jul 1940 | Box 150 \ 2 scan0367 | |
| Request for a report on an attached Buick radiator cap. | 7th Jul 1940 | Box 150 \ 2 scan0368 | |
| Request for information on dissipation curves and other data for Mk.VI matrices. | 31th Dec 1940 | Box 150 \ 2 scan0369 | |
| Letter to Morris Motors Ltd. regarding the manufacture of a B.V inner radiator unit. | 27th Mar 1941 | Box 150 \ 2 scan0370 | |
| The price for altering an inner radiator unit. | 11th Apr 1941 | Box 150 \ 2 scan0371 | |
| Instruction to send accompanying parts for an experimental matrix to Messrs. Morris Motors Ltd. | 30th Apr 1941 | Box 150 \ 2 scan0372 | |
| Letter to Morris Motors regarding the forwarding of an 'R.R.' type filler and steam valve body. | 30th Apr 1941 | Box 150 \ 2 scan0373 | |
| Investigation into radiator silting which revealed a manufacturing fault by the makers, John Marston Ltd. | 23th Jul 1941 | Box 150 \ 2 scan0374 | |
| Photograph showing a cross-section of a honeycomb radiator core. | 23th Jul 1941 | Box 150 \ 2 scan0375 | |
| Photograph of a rectangular metal component with an arrow pointing to an oval indentation. | 13th Sep 1941 | Box 150 \ 2 scan0376 | |
| Comparing under-bonnet temperatures with fixed vs. thermostatically operated radiator shutters on B11 & BV cars. | 13th Sep 1941 | Box 150 \ 2 scan0377 | |
| Log of under bonnet and water temperatures for two different engine models over a 15-minute period. | 13th Sep 1941 | Box 150 \ 2 scan0378 | |
| Letter to Clayton Dewandre Co. Ltd. discussing Mark V and Mark VI radiator core test results and requesting further tests. | 9th Apr 1936 | Box 150 \ 3 scan0001 | |
| Instructing a worker to fit special radiator inlet pipes for rig testing. | 15th Apr 1936 | Box 150 \ 3 scan0002 | |
| Letter from John Marston Ltd regarding analysed weights of matrices and the production of an American Matrix. | 17th Apr 1935 | Box 150 \ 3 scan0003 | |
| Comparison table of specifications for Marston Mark VI and American Bonded Core radiator blocks. | 21th Apr 1936 | Box 150 \ 3 scan0004 | |
| Letter from Serck Radiators Limited proposing a new streamline tube block for motor car radiators. | 21th Apr 1936 | Box 150 \ 3 scan0005 | |
| Letter to Serck Radiators Ltd. requesting a specimen streamline tube block for testing. | 27th Apr 1936 | Box 150 \ 3 scan0006 | |
| Letter to Clayton Dewandre Ltd. regarding testing a Serck radiator matrix and oil cooler test figures. | 27th Apr 1936 | Box 150 \ 3 scan0007 | |
| Letter to John Marston Ltd. regarding the performance of an experimental Mark VI core and comparison with Harrison Co. data. | 27th Apr 1936 | Box 150 \ 3 scan0008 | |
| Request for comparative figures for the 84 m.m. Harrison block and the 84 m.m. Mark VI block. | 27th Apr 1936 | Box 150 \ 3 scan0009 | |
| Performance chart for A.CRV. cores with varying gaps. | 29th Apr 1936 | Box 150 \ 3 scan0010 | |
| Letter from Serck Radiators Limited regarding their arrangement to send an S.T. type core for testing. | 29th Apr 1936 | Box 150 \ 3 scan0011 | |
| Letter from John Marston Ltd regarding the repair of a Test Plant and tests on a Harrison Mark VI radiator. | 29th Apr 1936 | Box 150 \ 3 scan0012 | |
| Letter from Clayton Dewandre Co. regarding testing a Serck radiator matrix and oil cooler trials. | 29th Apr 1936 | Box 150 \ 3 scan0013 | |
| Letter to John Marston Ltd. regarding the performance of their Mark VI cores and requesting a supply date. | 1st May 1936 | Box 150 \ 3 scan0014 | |
| Letter from John Marston Limited regarding the production of a Mark VI core and the arrival of a related machine. | 4th May 1936 | Box 150 \ 3 scan0015 | |
| Letter from John Marston Limited concerning the testing and production of Mark VI radiator cores. | 4th May 1936 | Box 150 \ 3 scan0016 | |
| Letter from Gallay Ltd. requesting test results for their Patent Non-Erodible Type Radiator Block and Oil Cooler. | 5th May 1936 | Box 150 \ 3 scan0017 | |
| Letter to Gallay Ltd. concerning test results and pricing for Bentley and 20/25 radiator matrixes. | 8th May 1936 | Box 150 \ 3 scan0018 | |
| New drawings and replacement parts for the Bentley II Chassis water temperature regulator. | 24th May 1937 | Box 150 \ 3 scan0019 | |
| List of parts exceptions and replacements for various standard configurations. | 24th May 1937 | Box 150 \ 3 scan0020 | |
| Request to send an official order to Messrs. John Marston for one Mark VI matrix. | 29th May 1936 | Box 150 \ 3 scan0021 | |
| Letter to John Marston Ltd. requesting the supply of a custom radiator matrix with modified dimensions. | 29th May 1936 | Box 150 \ 3 scan0022 | |
| Request to order a patent non-erodible type radiator block from Messrs. Gallay Ltd. | 29th Jun 1936 | Box 150 \ 3 scan0023 | |
| Letter to supplier Messrs. Gallay Ltd. concerning an outstanding reply, pricing, and an official order for various parts. | 29th Jun 1936 | Box 150 \ 3 scan0024 | |
| Letter to Messrs. John Marston Ltd. regarding a Phantom III oil cooler constructed with high-temperature solder. | 29th Jun 1936 | Box 150 \ 3 scan0025 | |
| Letter from Gallay Ltd. acknowledging an order and explaining a price difference on a non-standard Bentley Core. | 3rd Jul 1936 | Box 150 \ 3 scan0026 | |
| Letter from Gallay Ltd. regarding their non-erodible core patent and the structural benefits for radiator construction. | 4th Jul 1936 | Box 150 \ 3 scan0027 | |
| Letter to Gallay Ltd regarding omitted drawings for radiator matrices and associated parts. | 8th Jul 1936 | Box 150 \ 3 scan0028 | |
| Letter from Gallay Ltd acknowledging receipt of drawing E.88288 and prints, advising the Matrix is now in production. | 8th Jul 1936 | Box 150 \ 3 scan0029 | |
| Letter from Gallay Ltd. advising of the despatch of a Radiator Block and discussing alternative block depths. | 29th Jul 1936 | Box 150 \ 3 scan0030 | |
| Letter to Messrs. Gallay Ltd. concerning a discrepancy in the matrix depth of a Phantom III block. | 30th Jul 1936 | Box 150 \ 3 scan0031 | |
| Letter to Messrs. John Marston, Ltd. arranging a meeting to discuss oil coolers and radiators. | 4th Aug 1936 | Box 150 \ 3 scan0032 | |
| The dispatch of a Gallay type radiator test block to John Marston Ltd. for experimental testing. | 6th Aug 1936 | Box 150 \ 3 scan0033 | |
| Letter to John Marston Ltd. regarding the dispatch of a radiator test block. | 6th Aug 1936 | Box 150 \ 3 scan0034 | |
| Request to send an official order to Messrs. G.A. Harvey & Co. Ltd. for wire mesh. | 13th Aug 1936 | Box 150 \ 3 scan0035 | |
| Letter to Messrs. G.A. Harvey & Co. Ltd. requesting three specific samples of wire mesh. | 13th Aug 1936 | Box 150 \ 3 scan0036 | |
| Page two of a letter providing specifications for a wire-bound mesh order. | 14th Aug 1936 | Box 150 \ 3 scan0037 | |
| Letter from G.A. Harvey & Co. to Rolls-Royce clarifying details for an order of three pieces of mesh. | 14th Aug 1936 | Box 150 \ 3 scan0038 | |
| Letter to G.A. Harvey & Co. confirming specifications for corrugated diamond mesh. | 15th Aug 1936 | Box 150 \ 3 scan0039 | |
| Letter from John Marston Limited regarding the receipt and planned testing of a Chausson block. | 18th Aug 1936 | Box 150 \ 3 scan0040 | |
| Letter from Gallay Ltd. regarding the supply and specification of a Non-Erodible Block. | 31th Jul 1936 | Box 150 \ 3 scan0041 | |
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