| Description | Date | Identifier | |
| Letter to John Marston Limited thanking them for correcting inaccuracies in matrix blocks. | 26th Jul 1933 | Box 149a \ 2 scan0171 | |
| Introduction of a new, more efficient Harrison Vee Bonded Core radiator matrix for various car models. | 26th Jul 1933 | Box 149a \ 2 scan0172 | |
| ROY forwarding a quotation from Gallay Ltd for Rolls-Bentley radiators. | 28th Aug 1933 | Box 149a \ 2 scan0173 | |
| The price, delivery, and testing of an American type radiator matrix from John Marston Ltd. | 29th Aug 1933 | Box 149a \ 2 scan0174 | |
| Letter from The Searle Radiator Company Ltd. regarding radiator samples and future supply. | 1st Sep 1933 | Box 149a \ 2 scan0175 | |
| Test results for three L.A. Type radiator models, detailing performance metrics over time. | 1st Sep 1933 | Box 149a \ 2 scan0176 | |
| Test report detailing temperature readings for an L.A. type radiator over a 120-minute period. | 6th Sep 1933 | Box 149a \ 2 scan0177 | |
| Letter to The Searle Radiator Co. Ltd. requesting a comparison of their radiator block against the Harrison Vee Bonded Core radiator. | 6th Sep 1933 | Box 149a \ 2 scan0178 | |
| The minimum thickness of a Marston-made Harrison Vee radiator core for a Bentley car. | 6th Sep 1933 | Box 149a \ 2 scan0179 | |
| Letter from The Searle Radiator Company Ltd. acknowledging receipt of a letter from the Experimental Dept. | 7th Sep 1933 | Box 149a \ 2 scan0180 | |
| Letter from John Marston Limited concerning modified jigging arrangements for radiator matrices. | 11th Sep 1933 | Box 149a \ 2 scan0181 | |
| Letter to John Marston Ltd. confirming the successful modification of a radiator matrix sample. | 13th Sep 1933 | Box 149a \ 2 scan0182 | |
| Letter from a radiator supplier unable to comment on a Harrison Vee Bonded core, instead offering their own patented film block for testing. | 14th Sep 1933 | Box 149a \ 2 scan0183 | |
| From Roy discussing the standardisation of the Marston Type Matrix for the 'R2' Series 40/50-HP chassis. | 22th Sep 1933 | Box 149a \ 2 scan0184 | |
| Request for a test Harrison Vee bonded core matrix and a follow-up on a previous order for Harrison blocks. | 25th Sep 1933 | Box 149a \ 2 scan0185 | |
| Letter from John Marston Limited regarding a delay in the supply of radiator core matrices. | 26th Sep 1933 | Box 149a \ 2 scan0186 | |
| Standardising the Marston Type Matrix for the 40/50-HP Chassis. | 5th Oct 1933 | Box 149a \ 2 scan0187 | |
| Decision not to standardise the Marston radiator matrix for the standard 40/50 chassis. | 6th Oct 1933 | Box 149a \ 2 scan0188 | |
| Newly purchased Leyland Lorry and potential radiator modifications. | 30th Oct 1933 | Box 149a \ 2 scan0189 | |
| From Leyland regarding overheating and cleaning procedures for 'Still' tube radiators. | 31th Oct 1933 | Box 149a \ 2 scan0190 | |
| From ROY to Hs. regarding the fitting and ordering of different radiator types for various chassis models. | 31th Oct 1933 | Box 149a \ 2 scan0191 | |
| Consideration of a patent block radiator from the Searle Radiator Company to replace the standard Marston radiator. | 3rd Nov 1933 | Box 149a \ 2 scan0192 | |
| Passing on specimens of a Searle Radiator Block and opining it is less efficient than the Harrison type. | 29th Nov 1933 | Box 149a \ 2 scan0193 | |
| Function and efficiency of American 'Cuno' anti-spill radiator caps. | 3rd May 1934 | Box 149a \ 2 scan0194 | |
| Letter to John Marston Ltd. regarding latest improvements in radiator matrix design from the Harrison Radiator Co. | 3rd May 1934 | Box 149a \ 2 scan0195 | |
| Letter from John Marston Limited regarding the increased efficiency of the Harrison Radiator Core and arranging a meeting. | 4th May 1934 | Box 149a \ 2 scan0196 | |
| Letter to Messrs. John Marston Limited arranging a meeting with Mr. Dalrymple. | 5th May 1934 | Box 149a \ 2 scan0197 | |
| Request to detail alterations for testing a 70 mm Harrison Vee bonded matrix radiator on a Phantom II car. | 9th May 1934 | Box 149a \ 2 scan0198 | |
| Letter to John Marston Ltd. requesting the urgent supply of a Harrison Vee radiator for a 20/25HP car. | 9th May 1934 | Box 149a \ 2 scan0199 | |
| Internal request to order two Harrison Vee bonded matrix blocks from Messrs. John Marston Ltd. | 9th May 1934 | Box 149a \ 2 scan0200 | |
| Letter to John Marston Ltd. clarifying the parts required for constructing a radiator using a Harrison Vee matrix, as per drawing E.56831. | 24th May 1934 | Box 149a \ 2 scan0201 | |
| Letter to John Marston Ltd. regarding a shutter thermostat control matrix and associated drawings. | 8th Jun 1934 | Box 149a \ 2 scan0202 | |
| Completion of a Harrison Vee matrix and instructions to build a 25 HP radiator for car 21.G.IV. | 19th Jun 1934 | Box 149a \ 2 scan0203 | |
| Letter from John Marston Limited regarding an order for a tinned copper matrix. | 25th Jun 1934 | Box 149a \ 2 scan0204 | |
| Letter from John Marston Limited acknowledging an order for a Harrison Vee Radiator Matrix. | 27th Jun 1934 | Box 149a \ 2 scan0205 | |
| Manufacturing of radiator matrices and correspondence with supplier John Marston. | 27th Jun 1934 | Box 149a \ 2 scan0206 | |
| Letter from John Marston Limited detailing manufacturing processes and quoting for Mark III and Mark V matrices. | 26th Jun 1934 | Box 149a \ 2 scan0207 | |
| Price quotation from John Marston Ltd. for various parts, comparing old prices with new process prices. | 26th Jun 1934 | Box 149a \ 2 scan0208 | |
| Required improvements and cost adjustments for radiator matrices from John Marston Limited. | 29th Jun 1934 | Box 149a \ 2 scan0209 | |
| Letter to John Marston, Ltd. regarding the specifications and ordering of Phantom & Bentley radiators. | 30th Jun 1934 | Box 149a \ 2 scan0210 | |
| Postscript requesting the despatch of two radiators for Phantom & Bentley models. | 30th Jun 1934 | Box 149a \ 2 scan0211 | |
| Requesting to cancel one order and increase another for Harrison Vee matrices, with an update on starting handle tunnel pieces. | 30th Jun 1934 | Box 149a \ 2 scan0212 | |
| Request to make parts for a second 58mm Harrison Vee bonded matrix for Bentley and send them to Messrs. John Marston. | 30th Jun 1934 | Box 149a \ 2 scan0213 | |
| Request to prepare and send parts for a 58mm Harrison Vee bonded matrix for fan noise and efficiency tests. | 28th Aug 1934 | Box 149a \ 2 scan0214 | |
| Order for a 20/25 HP 58mm Marston Mark V Radiator Matrix for the Experimental Department. | 28th Aug 1934 | Box 149a \ 2 scan0215 | |
| To order Mark III radiator matrices for 20/25-HP and Bentley chassis from John Marston Ltd. | 24th Sep 1934 | Box 149a \ 2 scan0216 | |
| Follow-up memo requesting clarification on which type of Marston Radiator Matrix to order for 20/25-HP Chassis and Bentley 'D' Series. | 4th Oct 1934 | Box 149a \ 2 scan0217 | |
| Arranging a meeting with representatives from I.C.I. Metals Ltd and Messrs. Marstons Ltd to discuss radiators. | 7th Nov 1934 | Box 149a \ 2 scan0218 | |
| Expressing dissatisfaction with an anti-spill radiator cap and recommending consideration of a 'Camel' valve. | 16th Nov 1934 | Box 149a \ 2 scan0219 | |
| Letter forwarding a sample of a radiator matrix and requesting its return after examination. | 27th Dec 1934 | Box 149a \ 2 scan0220 | |
| Letter to John Marston Ltd. regarding a new American Harrison Vee radiator matrix and a proposal to compare it with their current design. | 28th Dec 1934 | Box 149a \ 2 scan0221 | |
| Requesting the construction of a radiator from a new Harrison matrix copy. | 3rd Apr 1935 | Box 149a \ 2 scan0222 | |
| Letter requesting the return of a Marston Mark V radiator matrix specimen block. | 6th Jun 1935 | Box 149a \ 2 scan0223 | |
| Letter from consulting engineer W.W. Constantine regarding the return of a loaned Marston Mark V radiator matrix. | 7th Jun 1935 | Box 149a \ 2 scan0224 | |
| To Roy requesting prices for two types of 20/25 matrices from Messrs. John Marston & Co. | 24th Jun 1935 | Box 149a \ 2 scan0225 | |
| Questioning the necessity and scientific basis of using 'Scale Buoys' to prevent corrosion. | 25th Jun 1935 | Box 149a \ 2 scan0226 | |
| Correcting a pricing error for 20/25 matrices, noting an increase rather than the quoted decrease. | 26th Jun 1935 | Box 149a \ 2 scan0227 | |
| Requesting prices for 20/25 radiator matrices from John Marston & Co., with a handwritten inquiry about associated drawing numbers. | 24th Jun 1935 | Box 149a \ 2 scan0228 | |
| Letter to John Marston & Co. Ltd. detailing the results of comparative tests on three different radiator matrices. | 30th Jul 1935 | Box 149a \ 2 scan0229 | |
| Letter from John Marston Limited to discuss the results of tests on various cores. | 31th Jul 1935 | Box 149a \ 2 scan0230 | |
| Letter to John Marston Limited arranging a meeting with Mr. Dalrymple. | 6th Aug 1935 | Box 149a \ 2 scan0231 | |
| Summary comparing the cooling performance and weights of different radiator matrices. | 8th Aug 1935 | Box 149a \ 2 scan0232 | |
| Programme for radiator matrix tests comparing an American Harrison Vee with a Marston Mark VI matrix. | 9th Aug 1935 | Box 149a \ 2 scan0233 | |
| Specifications and conditions for testing and improving Mark VI radiator blocks. | 9th Aug 1935 | Box 149a \ 2 scan0234 | |
| Letter from John Marston Limited regarding arrangements for tests on heat dissipation. | 13th Aug 1935 | Box 149a \ 2 scan0235 | |
| Letter from John Marston Limited regarding a missing drawing, tool modifications for a matrix, and radiator test results. | 9th Sep 1935 | Box 149a \ 2 scan0236 | |
| Letter to John Marston Limited regarding omitted drawings and arranging a visit to commence tests. | 11th Sep 1935 | Box 149a \ 2 scan0237 | |
| Order of 50 gallons of 'Swan' 680 petrol for testing on Spectre and Bentley chassis. | 16th Sep 1935 | Box 149a \ 2 scan0238 | |
| Telegram received by telephone from Sunbeam regarding tests being ready for a visit. | 25th Sep 1935 | Box 149a \ 2 scan0239 | |
| Letter from Gallay Ltd. concerning a new patented non-erodible type of radiator core for aircraft. | 24th Sep 1935 | Box 149a \ 2 scan0240 | |
| Page two of a letter from Gallay Ltd. concerning the testing of a heat transfer system. | 24th Sep 1935 | Box 149a \ 2 scan0241 | |
| Requesting the despatch of a radiator matrix to Messrs. John Marston Ltd. for stripping and examination. | 27th Sep 1935 | Box 149a \ 2 scan0242 | |
| Letter to John Marston Ltd. regarding the return and correction of an incorrect Bentley radiator matrix. | 27th Sep 1935 | Box 149a \ 2 scan0243 | |
| Letter from John Marston Limited regarding a matrix from drawing E.B.518 and an enclosed report. | 30th Sep 1935 | Box 149a \ 2 scan0244 | |
| Report from John Marston Limited on a visit from Mr. Steadman to test and compare radiator cores. | 30th Sep 1935 | Box 149a \ 2 scan0245 | |
| Telegram received by telephone from Sunbeam regarding a core that has not yet been received. | 15th Oct 1935 | Box 149a \ 2 scan0246 | |
| Letter to John Marston Ltd. regarding a delayed radiator core and urging the supply of a Phantom III radiator matrix. | 15th Oct 1935 | Box 149a \ 2 scan0247 | |
| Letter from John Marston Limited regarding the despatch and manufacture of radiator matrices. | 16th Oct 1935 | Box 149a \ 2 scan0248 | |
| Letter from Reichwald (London) Limited to Bentley Motors regarding radiator grilles on show at Olympia. | 18th Oct 1935 | Box 149a \ 2 scan0249 | |
| Letter to John Marston Ltd. regarding an order for a Phantom III radiator matrix and potential modifications. | 22th Oct 1935 | Box 149a \ 2 scan0250 | |
| Letter to John Marston Ltd. concerning the return of tested Bentley radiators and an order for new Phantom III matrices. | 30th Oct 1935 | Box 149a \ 2 scan0251 | |
| The testing and modification of a Bentley radiator fitted with a Mark VI matrix. | 30th Oct 1935 | Box 149a \ 2 scan0252 | |
| Confirming the dispatch of 1 gallon of Price's Amber 'B' Gear Oil to G.W. Hancock in France. | 30th Oct 1935 | Box 149a \ 2 scan0253 | |
| Letter of complaint to John Marston Ltd. regarding a defective Mark VI matrix. | 1st Nov 1935 | Box 149a \ 2 scan0254 | |
| Letter from John Marston Ltd. regarding the production and quality of experimental Mark VI Matrices. | 4th Nov 1935 | Box 149a \ 2 scan0255 | |
| Radiator test rig results from a visit to John Marston Ltd, comparing different matrix types. | 6th Nov 1935 | Box 149a \ 2 scan0256 | |
| Critique of a test rig's methodology for measuring water flow, air flow, air speed, and temperature. | 6th Nov 1935 | Box 149a \ 2 scan0257 | |
| Recommendations for improving a test rig used for measuring water flow and heat dissipation in radiator matrices. | 6th Nov 1935 | Box 149a \ 2 scan0258 | |
| Summary of test sheets comparing heat dissipation and air speed in different car radiator matrices. | 6th Nov 1935 | Box 149a \ 2 scan0259 | |
| Summary of test results for various radiator matrices, discussing test rig limitations and recommendations. | 6th Nov 1935 | Box 149a \ 2 scan0260 | |
| Calculations for Spectre Matrix heat dissipation and critical air temperature based on test bed figures. | 6th Nov 1935 | Box 149a \ 2 scan0261 | |
| Page of calculations for correcting the pressure under a car's bonnet based on speed and rig conditions. | 6th Nov 1935 | Box 149a \ 2 scan0262 | |
| Calculations for engine cooling performance, heat dissipation, and critical air temperature. | 6th Nov 1935 | Box 149a \ 2 scan0263 | |
| Calculations for heat dissipation and critical temperature, comparing Mark VI and Mark V components. | 6th Nov 1935 | Box 149a \ 2 scan0264 | |
| Calculation of critical air temperature for a Bentley using a Marston Mark VI matrix at full throttle. | 7th Nov 1935 | Box 149a \ 2 scan0265 | |
| Estimation of theoretical pressure under the Spectre bonnet at a car speed of 85 m.p.h. | 6th Nov 1935 | Box 149a \ 2 scan0266 | |
| Notes on pressure tests conducted under a Spectre bonnet, with a handwritten note indicating the page was not sent out. | 6th Nov 1935 | Box 149a \ 2 scan0267 | |
| Graph comparing the cooling properties of Marston MK VI and A.H.V. 52 MM Bentley matrices. | 11th Oct 1935 | Box 149a \ 2 scan0268 | |
| Graph comparing the cooling performance of MK V and MK VI Marston matrices against car speed. | 11th Oct 1935 | Box 149a \ 2 scan0269 | |
| Graph showing the variation of cooling with matrix depth at various car speeds for Marston MK V matrices. | 11th Oct 1935 | Box 149a \ 2 scan0270 | |
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