| Description | Date | Identifier | |
| Letter to John Marston & Co. Ltd. regarding radiator matrix weight reduction for the Ph.III car. | 4th Sep 1936 | Box 150 \ 3 scan0042 | |
| Letter concerning the supply and testing of a Mark VI core and a proposed visit to the Harrison Radiator Corporation. | 4th Sep 1936 | Box 150 \ 3 scan0043 | |
| Letter from John Marston Limited acknowledging receipt of a prior letter and advising a full reply will follow. | 7th Sep 1936 | Box 150 \ 3 scan0044 | |
| Letter from John Marston Ltd. discussing radiator matrix weights for the Phantom III car, referencing different thicknesses of copper strip. | 15th Sep 1936 | Box 150 \ 3 scan0045 | |
| Specification table detailing component weights for the Marston Mark VI. | 16th Sep 1936 | Box 150 \ 3 scan0046 | |
| Letter of introduction for Mr. Dunn to the Harrison Radiator Corporation regarding Phantom III cooling systems. | 16th Sep 1936 | Box 150 \ 3 scan0047 | |
| Request to send an official order to Messrs. John Marston & Co. for a Phantom III radiator matrix. | 18th Sep 1936 | Box 150 \ 3 scan0048 | |
| Request to John Marstons Ltd for a specific radiator matrix with specified dimensions. | 24th Sep 1936 | Box 150 \ 3 scan0049 | |
| Saving weight and cost on car radiators by reducing the matrix size on Bentley models. | 28th Sep 1936 | Box 150 \ 3 scan0050 | |
| Modifications to the radiator matrix to reduce frontal area, weight, and cost. | 28th Sep 1936 | Box 150 \ 3 scan0051 | |
| Radiator matrix design and cooling performance for Bentley and Phantom III models. | 28th Aug 1936 | Box 150 \ 3 scan0052 | |
| Letter to John Marstons Ltd regarding the delivery of a special Bentley radiator matrix and a Phantom III special matrix. | 30th Sep 1936 | Box 150 \ 3 scan0053 | |
| Letter to John Marston Ltd. chasing the delivery of a special Phantom III Mark VI matrix. | 6th Oct 1936 | Box 150 \ 3 scan0054 | |
| The testing and comparison of Gallay radiator matrices and an oil cooler against standard products. | 6th Oct 1936 | Box 150 \ 3 scan0055 | |
| Comparison of weights and costs for Marstons and Gallay radiator matrices for Bentley and Phantom III models. | 6th Oct 1936 | Box 150 \ 3 scan0056 | |
| Comparison table of performance data for three different oil cooler models. | 6th Oct 1936 | Box 150 \ 3 scan0057 | |
| Oil pressure trials conducted on different types of oil coolers. | 6th May 1936 | Box 150 \ 3 scan0058 | |
| Graph comparing the performance of different types of matrix cores. | 6th May 1936 | Box 150 \ 3 scan0059 | |
| Performance comparison graph for different types of oil coolers, plotting heat dissipation, pressure drop, and flow rates. | 1st Oct 1936 | Box 150 \ 3 scan0060 | |
| Graph comparing the performance of Marston Mark VI and Gallay radiator cores based on tests conducted by John Marston Ltd. | 13th Jul 1936 | Box 150 \ 3 scan0061 | |
| Graph comparing the performance of Harrison vs. Chausson-Gallay components. | 13th Jul 1936 | Box 150 \ 3 scan0062 | |
| Letter to Gallay Ltd. discussing the results of tests on radiator matrices and coil coolers. | 7th Oct 1936 | Box 150 \ 3 scan0063 | |
| Letter discussing the test results of a Gallay oil cooler compared to in-house models, declining its adoption. | 7th Oct 1936 | Box 150 \ 3 scan0064 | |
| Letter from John Marston Limited regarding the delivery of a special Phantom III Mark VI Matrix. | 7th Oct 1936 | Box 150 \ 3 scan0065 | |
| Letter to a supplier regarding the disappointing weight-saving of a modified Phantom III radiator matrix. | 12th Oct 1936 | Box 150 \ 3 scan0066 | |
| The return of an unordered Gallay radiator matrix. | 16th Oct 1936 | Box 150 \ 3 scan0067 | |
| Letter from John Marston Limited discussing the weight and cost variations of Mark VI cores based on material thickness. | 16th Oct 1936 | Box 150 \ 3 scan0068 | |
| Letter discussing adequate cooling and weight for a 40/50 job, comparing test figures with the MK VI or Harrison. | 16th Oct 1936 | Box 150 \ 3 scan0069 | |
| Letter discussing travel arrangements and the subsequent sharing of results. | 19th Oct 1936 | Box 150 \ 3 scan0070 | |
| Letter to Gallay Ltd. regarding the return of an unsuitable four-row tube radiator matrix. | 19th Oct 1936 | Box 150 \ 3 scan0071 | |
| Letter from Gallay Ltd. concerning a misunderstanding over the specifications of a manufactured 84 m/m block. | 20th Oct 1936 | Box 150 \ 3 scan0072 | |
| To Roy requesting an order for a lightened Phantom III radiator matrix from John Marstons Ltd. | 29th Oct 1936 | Box 150 \ 3 scan0073 | |
| Letter to John Marston Ltd. discussing weight discrepancies and savings on Phantom III and Bentley matrices. | 29th Oct 1936 | Box 150 \ 3 scan0074 | |
| Letter discussing weight variations in Bentley matrices, comparison to Harrison products, and supply of Mk. VI cores. | 22th Oct 1936 | Box 150 \ 3 scan0075 | |
| Specification detailing modifications to Bentley matrices, including a height reduction and the deletion of the tunnel tube. | 12th Nov 1936 | Box 150 \ 3 scan0076 | |
| Official order for two radiator matrix specifications from Messrs John Marston Ltd. | 12th Nov 1936 | Box 150 \ 3 scan0077 | |
| Letter to John Marstons Ltd. regarding pressure testing requirements for a radiator matrix. | 17th Nov 1936 | Box 150 \ 3 scan0078 | |
| Letter regarding the air under water test pressure for a Radiator Matrix, part number EX.24776. | 18th Nov 1936 | Box 150 \ 3 scan0079 | |
| Dispatch memo detailing the forwarding of a damaged radiator and two car heaters for examination and testing. | 23th Nov 1936 | Box 150 \ 3 scan0080 | |
| List of fittings with quantities for Hadees and Tropic-Aire car heaters. | 23th Nov 1936 | Box 150 \ 3 scan0081 | |
| Letter to Messrs John Marstons Ltd. regarding a damaged Ph.III radiator matrix and potential repair. | 23th Nov 1936 | Box 150 \ 3 scan0082 | |
| Letter to Messrs. John Marstons Ltd. confirming a delivery promise for an experimental matrix and the construction of an oil cooler top plate. | 27th Nov 1936 | Box 150 \ 3 scan0083 | |
| Alterations to car matrices, specifically the waterways and airway strips, for a 15,000-mile test. | 8th Dec 1936 | Box 150 \ 3 scan0084 | |
| Letter from John Marston Ltd. confirming specifications for experimental Phantom III and other radiator cores. | 12th Dec 1936 | Box 150 \ 3 scan0085 | |
| Letter to Messrs. N. Greening & Sons Ltd. requesting the production of three filter gauge cups for experimental purposes. | 12th Dec 1936 | Box 150 \ 3 scan0086 | |
| Letter confirming receipt of a previous letter and advising that 3 filter gauge cups are being sent. | 15th Dec 1936 | Box 150 \ 3 scan0087 | |
| Request for a quotation to supply production quantities of rubber water connections for various car models. | 16th Dec 1936 | Box 150 \ 3 scan0088 | |
| Letter to a supplier about incorrectly supplied filter gauze cups and clarifying the required specifications. | 16th Dec 1936 | Box 150 \ 3 scan0089 | |
| Letter to John Marstons Ltd. regarding Clayton Car Heaters and radiator core specifications and costs. | 16th Dec 1936 | Box 150 \ 3 scan0090 | |
| List of queries regarding the supply and performance of various radiator matrices and airway strips. | 17th Dec 1936 | Box 150 \ 3 scan0091 | |
| Letter from John Marston Limited regarding a delay in answering questions about Matrices for a Clayton Car Heater due to customs issues with American Sample Cores. | 17th Dec 1936 | Box 150 \ 3 scan0092 | |
| Letter from N. Greening & Sons regarding the replacement of three unsatisfactory copper gauze cups. | 17th Dec 1936 | Box 150 \ 3 scan0093 | |
| Letter to John Marston Ltd. concerning a planned visit and discussion points on radiator cores, matrix weights, and car heaters. | 19th Dec 1936 | Box 150 \ 3 scan0094 | |
| Letter detailing manufacturing queries regarding Mk.V and Mk.VI cores and radiator shells. | 21th Dec 1936 | Box 150 \ 3 scan0095 | |
| On the satisfactory results and gains from using the Marston radiator core. | 21th Dec 1936 | Box 150 \ 3 scan0096 | |
| Summary comparing the performance and reliability of various radiator matrices across different car models. | 21th Dec 1936 | Box 150 \ 3 scan0097 | |
| Comparison of complaints regarding radiator leaks and overheating on various car models. | 21th Dec 1936 | Box 150 \ 3 scan0098 | |
| Comparison table of radiator matrix specifications including heat dissipation, weight, critical air temperatures, and cost. | 21th Dec 1936 | Box 150 \ 3 scan0099 | |
| Letter from John Marston Limited confirming a revised meeting time and the receipt of matrices from America. | 21th Dec 1936 | Box 150 \ 3 scan0100 | |
| Quotation for petrol and oil resisting hose connections from The Leyland & Birmingham Rubber Co Ltd. | 23th Dec 1936 | Box 150 \ 3 scan0101 | |
| Quotation from British Tyre & Rubber Co. for hot water connections for Bentley, 25/30, and Phantom III models. | 30th Dec 1936 | Box 150 \ 3 scan0102 | |
| Letter from British Tyre & Rubber Co., Ltd. concerning a quotation and potential order. | 30th Dec 1936 | Box 150 \ 3 scan0103 | |
| Improvements and standardisation of car radiator matrices following a visit to John Marston Ltd. | 31th Dec 1936 | Box 150 \ 3 scan0104 | |
| The testing and standardization of radiator matrices for various car models. | 31th Dec 1936 | Box 150 \ 3 scan0105 | |
| The testing and standardisation of Marston radiator matrices for various car models. | 31th Dec 1936 | Box 150 \ 3 scan0106 | |
| Comparison of weight and cost savings with modified types of radiator matrices. | 31th Dec 1936 | Box 150 \ 3 scan0107 | |
| Invoices received for Gauze Cups and a request for payment authorisation. | 31th Dec 1936 | Box 150 \ 3 scan0108 | |
| Requesting the destruction of an old blueprint and attachment of a new one with corrected radiator matrix pricing. | 31th Dec 1936 | Box 150 \ 3 scan0109 | |
| Comparative table of various radiator matrix types, detailing their performance, weight, and cost. | 4th Jan 1936 | Box 150 \ 3 scan0110 | |
| Order for a Phantom III Mark VI radiator matrix from Messrs. John Marston Limited. | 4th Jan 1936 | Box 150 \ 3 scan0111 | |
| Letter to John Marston Limited regarding an order for a Phantom III matrix and a quotation for Bentley matrices. | 4th Jan 1937 | Box 150 \ 3 scan0112 | |
| Request to issue an official order for six gauze filter cups that have already been received. | 4th Jan 1937 | Box 150 \ 3 scan0113 | |
| Inquiry to John Marston Limited about potential cost reductions for matrixes by deleting starting handle tunnel tubes. | 6th Jan 1937 | Box 150 \ 3 scan0114 | |
| Potential radiator design improvements for the Bentley III, Wraith and Phantom III models. | 6th Jan 1937 | Box 150 \ 3 scan0115 | |
| List of technical points regarding shutter design, mounting, and materials. | 6th Jan 1937 | Box 150 \ 3 scan0116 | |
| Letter from John Marston Ltd. regarding price reductions and quotations for car matrices. | 7th Jan 1937 | Box 150 \ 3 scan0117 | |
| Letter from John Marston Limited concerning tests on American and Mark VI radiator cores. | 7th Jan 1937 | Box 150 \ 3 scan0118 | |
| Querying an invoice for a Phantom III Radiator Matrix repair and clarifying details with a previous order. | 12th Jan 1937 | Box 150 \ 3 scan0119 | |
| Order be sent for completed repair work on an American Harrison Vee Phantom III matrix. | 14th Jan 1937 | Box 150 \ 3 scan0120 | |
| Official order for rubber tubing and bungs from Messrs. Briggs & Co. Ltd. | 22th Jan 1937 | Box 150 \ 3 scan0121 | |
| Letter to supplier John Marston Ltd. regarding oil cooler failures and radiator matrix dimension inaccuracies. | 25th Jan 1937 | Box 150 \ 3 scan0122 | |
| Letter discussing the assembly of matrix side plates and a bottom tank, and requesting drawings and a quotation for oil coolers. | 27th Jan 1937 | Box 150 \ 3 scan0123 | |
| Letter from Hopkinsons Limited providing advice on materials for radiator valves, recommending Gun Metal and 'Platnam' metal. | 27th Jan 1937 | Box 150 \ 3 scan0124 | |
| Letter from Hopkinsons Limited regarding the design of valves for radiators. | 29th Jan 1937 | Box 150 \ 3 scan0125 | |
| Letter from John Marston Ltd. discussing oil coolers, radiator matrices, and shutter arrangements for the Bentley Shell. | 29th Jan 1937 | Box 150 \ 3 scan0126 | |
| Letter to Messrs. John Marston Ltd. to arrange a meeting with Mr. Dunn. | 1st Feb 1937 | Box 150 \ 3 scan0127 | |
| Letter to Messrs John Marston Ltd. regarding modifications to Phantom III and Bentley radiator matrices and shutters. | 4th Feb 1937 | Box 150 \ 3 scan0128 | |
| Letter discussing a proposed car heater and a dummy shutter arrangement. | 4th Feb 1937 | Box 150 \ 3 scan0129 | |
| 'silted-up' Phantom III Mark V radiator matrices causing a loss of cooling efficiency. | 1st Jan 1937 | Box 150 \ 3 scan0130 | |
| Flow test results and inspection notes for various radiator models, including commentary on blockages and treatments. | 4th Feb 1937 | Box 150 \ 3 scan0131 | |
| Despatch of a special Ph.III Mark VI matrix to Messrs. John Marston & Co. Ltd. for alterations. | 4th Feb 1937 | Box 150 \ 3 scan0132 | |
| Letter from John Marston Limited clarifying the price difference for radiator matrices. | 4th Feb 1937 | Box 150 \ 3 scan0133 | |
| To order experimental Bentley radiator matrixes and rectify incorrect parts. | 5th Feb 1937 | Box 150 \ 3 scan0134 | |
| Despatch note for Phantom III and Bentley radiator and tank parts to be sent to J. Marston Ltd. | 11th Feb 1937 | Box 150 \ 3 scan0135 | |
| Letter from Rotherham & Sons Ltd regarding the unsuitability of a sample filler cap due to spring failures. | 15th Feb 1937 | Box 150 \ 3 scan0136 | |
| Standardization of fixed dummy shutters and a new thermostatic by-pass system design. | 22th Feb 1937 | Box 150 \ 3 scan0137 | |
| Letter regarding sample pieces of Staybrite and Mild Steel Stiffeners, and declining a spot welding proposition. | 23th Feb 1937 | Box 150 \ 3 scan0138 | |
| Letter to Messrs Fisher & Ludlow Ltd acknowledging receipt of their correspondence. | 25th Feb 1937 | Box 150 \ 3 scan0139 | |
| Request to send an official order to Messrs John Marstons for two types of radiator matrices. | 5th Mar 1937 | Box 150 \ 3 scan0140 | |
| Quoting and sampling process for Bentley and Phantom III radiator shells with Messrs. John Marston. | 6th Mar 1937 | Box 150 \ 3 scan0141 | |
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