| Description | Date | Identifier | |
| Modifying a radiator by dropping the shutter bearing plate to improve its appearance, to be tested on car 16-G-4. | 18th Dec 1930 | Box 105 \ 1 scan0107 | |
| Frame height of a test car compared to the Phantom II, noting its old-fashioned appearance and requesting a new design. | 16th Dec 1930 | Box 105 \ 1 scan0108 | |
| Standardisation of Chassis Parts - Radiator Cap with Anti-Splash Valve No. 5250. | 7th Nov 1930 | Box 105 \ 1 scan0109 | |
| Implementation and costs for fitting a new part to a chassis. | 23th Dec 1930 | Box 105 \ 1 scan0110 | |
| Design changes to the 25HP radiator for a deeper appearance, including a scale drawing. | 23th Dec 1930 | Box 105 \ 1 scan0111 | |
| Proposal to reduce front engine suspension overhang by repositioning the radiator and using a tubular cross-member. | 15th Jan 1931 | Box 105 \ 1 scan0112 | |
| Expressing doubt over a new radiator design for the 20/25 HP model, citing risks due to reduced water space. | 20th Jan 1931 | Box 105 \ 1 scan0113 | |
| Design improvements for a 'Japan Engine', focusing on crankshafts, flywheel vibrations, and overall simplicity. | 21th Jan 1931 | Box 105 \ 1 scan0114 | |
| Diagram of a starter handle shaft tube with notes, and a confirmation of a telegram from Royce regarding design simplifications. | 21th Jan 1931 | Box 105 \ 1 scan0115 | |
| Material and thickness specifications for radiator tubes. | 26th Jan 1931 | Box 105 \ 1 scan0116 | |
| Confirming that no modification will be made to the radiator shape for the 'T' Series chassis. | 27th Jan 1931 | Box 105 \ 1 scan0117 | |
| Proposed design changes to the bonnet, radiator, and dashboard for the 'Japan 3' model. | 31th Jan 1931 | Box 105 \ 1 scan0118 | |
| Proposed controls and instrument panel layout for the Japan 3 model. | 6th Feb 1931 | Box 105 \ 1 scan0119 | |
| Standardisation of turbulent flow radiator tubes for 20 HP and 40/50 HP chassis. | 18th Oct 1930 | Box 105 \ 1 scan0120 | |
| Design and mock-up requirements for a new car's bonnet, radiator, and dashboard. | 19th Feb 1931 | Box 105 \ 1 scan0121 | |
| Dimensional errors on the bonnet and radiator mock-up for the Japan III model. | 19th Mar 1931 | Box 105 \ 1 scan0122 | |
| Secret memo regarding a mistake with an incorrect bonnet sent for the Japan III project. | 20th Mar 1931 | Box 105 \ 1 scan0123 | |
| Correct dimensions of a mock-up bonnet and radiator for the 'Japan III' project. | 24th Mar 1931 | Box 105 \ 1 scan0124 | |
| Secret internal memo discussing the mock-up design for the bonnet, radiator, and dash of the 'Japan III' model. | 31th Mar 1931 | Box 105 \ 1 scan0125 | |
| Proposed modification to a radiator cap to prevent radiators from bursting. | 1st Apr 1931 | Box 105 \ 1 scan0126 | |
| Replying to a telegram about the progress and extended timeline for a job on the 25 HP Radiator T Series. | 7th May 1931 | Box 105 \ 1 scan0127 | |
| The urgent design of a 20/25 Radiator for the second half of the 'T' Series and potential chassis alterations. | 8th May 1931 | Box 105 \ 1 scan0128 | |
| Delay in the job for a 25 HP Radiator - T.Series. | 7th May 1931 | Box 105 \ 1 scan0129 | |
| Revised engine suspension with a dropped radiator for the 'JAPAN 1' scheme. | 1st May 1931 | Box 105 \ 1 scan0130 | |
| Modifications for the 'Japan 1' radiator, including thermostat control, top tank width, and spring tensions. | 2nd May 1931 | Box 105 \ 1 scan0131 | |
| Engine alignment during the removal of the front suspension. | 5th May 1931 | Box 105 \ 1 scan0132 | |
| Testing a rear shock damper to investigate a knocking sound on a 20 HP model. | 18th May 1931 | Box 105 \ 1 scan0133 | |
| Results of radiator tests at Brooklands, comparing hexagonal and square tube radiators. | 19th May 1931 | Box 105 \ 1 scan0134 | |
| Technical comparison of hexagon tube radiators and shuttered versus louvred bonnet ventilation systems. | 19th May 1931 | Box 105 \ 1 scan0135 | |
| Radiator efficiency gains and the need for a wind tunnel for further tube design development. | 19th May 1931 | Box 105 \ 1 scan0136 | |
| Water flow test results for four different radiator types on an SS.15 unit. | 21th Apr 1931 | Box 105 \ 1 scan0137 | |
| Comparison of radiator matrix types, detailing the atmospheric temperature at which boiling occurs at 30 and 45 M.P.H. | 21th Apr 1931 | Box 105 \ 1 scan0138 | |
| Comparison of car boiling temperatures based on the type of bonnet ventilation and driving speed. | 19th Aug 1931 | Box 105 \ 1 scan0139 | |
| Graph comparing pump performance with three different radiator types against engine RPM. | 19th Aug 1931 | Box 105 \ 1 scan0140 | |
| Performance comparison of different radiator matrix types under various test conditions. | 21th Apr 1931 | Box 105 \ 1 scan0141 | |
| Placeholder document indicating photostats are located with the original file. | 19th May 1931 | Box 105 \ 1 scan0142 | |
| Replacing Dermantine washers in the radiator anti-splash valve with a metal version to prevent radiators bursting. | 21th May 1931 | Box 105 \ 1 scan0143 | |
| Improvements, cost and weight reductions for 45 HP and 25 HP radiators. | 22th May 1931 | Box 105 \ 1 scan0144 | |
| Implications of using a large hexagonal radiator and potential overheating issues. | 27th May 1931 | Box 105 \ 1 scan0145 | |
| Requesting an experimental order of radiator tubes for 40/50 HP and 20/25 HP models. | 27th May 1931 | Box 105 \ 1 scan0146 | |
| Solutions to customer overheating complaints, focusing on radiator and bonnet design. | 28th May 1931 | Box 105 \ 1 scan0147 | |
| Modifications to radiators to reduce overheating and water boiling, with particular concern for cars in America. | 6th Jun 1931 | Box 105 \ 1 scan0148 | |
| Standardization of a small hexagon tube for weight reduction and improved safety. | 5th Jun 1931 | Box 105 \ 1 scan0149 | |
| Design, cost, and performance of radiator tubes and bonnet ventilation. | 12th Jun 1931 | Box 105 \ 1 scan0150 | |
| Proposal and objections to building an experimental 20/25 Special Touring Saloon with a dropped radiator. | 1st Jul 1931 | Box 105 \ 1 scan0151 | |
| Radiator modifications and tests in France for the 25 HP car, chassis 19-G4. | 18th Jul 1931 | Box 105 \ 1 scan0152 | |
| Comparative tests of two sizes of American-type radiator tubes and their effect on engine cooling. | 18th Jul 1931 | Box 105 \ 1 scan0153 | |
| Revisions to the 20/25 dropped radiator design, scheme 3313. | 20th Jul 1931 | Box 105 \ 1 scan0154 | |
| The standardisation of large diameter American radiator tubes for the 25 HP and 40/50 models. | 23th Jul 1931 | Box 105 \ 1 scan0155 | |
| Blueprints for a new large diameter American type matrix tube for the 20/25 HP chassis radiator. | 13th Aug 1931 | Box 105 \ 1 scan0156 | |
| Feedback memo on a new front engine and radiator support design for a 25 HP model. | 15th Aug 1931 | Box 105 \ 1 scan0157 | |
| Procedural document outlining modifications and instructions for Radiator Hex. ended Matrix Tubes for 40/50 HP and 20/25 HP models. | 9th Sep 1931 | Box 105 \ 1 scan0158 | |
| Instruction to order large diameter American hexagon ended dented tubes for the new 25 HP radiator. | 29th Sep 1931 | Box 105 \ 1 scan0159 | |
| Alterations to the engine and radiator suspension, detailing its new forward position. | 31th Oct 1931 | Box 105 \ 1 scan0160 | |
| Modifications to the engine and radiator suspension for the 'JAPAN 3' job. | 5th Nov 1931 | Box 105 \ 1 scan0161 | |
| Extract regarding the design of a rubber radiator and engine front end support for the J.3 & Peregrine models. | 10th Nov 1931 | Box 105 \ 1 scan0162 | |
| Standardisation of 25.HP. Matrix Tubes with 8 Indentations for chassis parts. | 19th Jan 1931 | Box 105 \ 1 scan0163 | |
| Fitting of a new part to a 'T' Series chassis for testing. | 30th Nov 1931 | Box 105 \ 1 scan0164 | |
| Comparison of weights and water capacities for 25 HP radiators with hexagonal-ended copper tubes versus old round-ended tubes. | 30th Nov 1931 | Box 105 \ 1 scan0165 | |
| Comparison of different radiator specifications, including chassis details, weight, and water capacity. | 20th May 1931 | Box 105 \ 1 scan0166 | |
| Blueprint for the manufacturing and testing of a brass matrix tube. | 20th May 1931 | Box 105 \ 1 scan0167 | |
| Blueprint for the design and manufacturing of a large matrix tube. | 16th Sep 1931 | Box 105 \ 1 scan0168 | |
| Blueprint for the manufacturing and testing of a brass matrix tube. | 30th Nov 1931 | Box 105 \ 1 scan0169 | |
| Clarifying the heading for the 20/25 HP radiator standardization sheet X.5250. | 3rd Dec 1931 | Box 105 \ 1 scan0170 | |
| Standardisation of chassis parts concerning the radiator being dropped 4 inches in the frame. | 7th Oct 1931 | Box 105 \ 1 scan0171 | |
| The standardisation of chassis parts, specifically the fitting of a new part to chassis 101 in 'T'. | 20th Jan 1937 | Box 105 \ 1 scan0172 | |
| Dropping the radiator 4 inches in the frame and milling the bottom plate to prevent stones jamming the thermostatically operated shutters. | 20th Oct 1931 | Box 105 \ 1 scan0173 | |
| Report concerning the standardization of chassis parts, specifying the first vehicle for fitment and associated tooling costs. | 17th Dec 1931 | Box 105 \ 1 scan0174 | |
| Design specifications for a new radiator, bonnet, and dash for project J.S. | 17th Dec 1931 | Box 105 \ 1 scan0175 | |
| Query about the shutter section shape and whether to continue with a loose shell design given the experience with stainless steel. | 17th Dec 1931 | Box 105 \ 1 scan0176 | |
| Radiator, bonnet, and dash designs and production for the J.3 chassis. | 19th Dec 1931 | Box 105 \ 1 scan0177 | |
| Three design schemes for radiator shutters. | 23th Jan 1932 | Box 105 \ 1 scan0178 | |
| Sending a drawing for the J. 3. radiator bottom tank and requesting prints in return. | 5th Feb 1932 | Box 105 \ 1 scan0179 | |
| Proposal to cheapen the manufacturing of radiator shutters using a standard tubular section. | 26th Feb 1932 | Box 105 \ 1 scan0180 | |
| Testing new radiator mounting bearing linings made from flaked fabric material for the 25HP model. | 19th Mar 1932 | Box 105 \ 1 scan0181 | |
| Radiator shutter failures on 25-HP models caused by stones, proposing design modifications. | 1st Jul 1932 | Box 105 \ 1 scan0182 | |
| Improvement of strip type radiators over the honeycomb type, referencing the Marston Mark II and Harrison designs. | 4th Jul 1932 | Box 105 \ 1 scan0183 | |
| Comparative tests of three types of radiators on a 20/25HP car at Brooklands. | 2nd Jul 1932 | Box 105 \ 1 scan0184 | |
| Radiator water temperature test results for various types under different driving conditions. | 14th Jul 1933 | Box 105 \ 1 scan0185 | |
| Performance comparison of M.S. Hexagon, Marston Mark III, and Harrison radiator matrices. | 2nd Jul 1932 | Box 105 \ 1 scan0186 | |
| Test report on fan belts, spark plugs, and silencer performance. | 2nd Jul 1933 | Box 105 \ 1 scan0187 | |
| Comparative tests on a 'Colt Fan' for a Phantom II car, noting its poor performance and noise issues. | 2nd Jul 1933 | Box 105 \ 1 scan0188 | |
| Radiator shutter failures on the 25HP model, particularly issues with stones jamming the mechanism. | 13th Jul 1932 | Box 105 \ 1 scan0189 | |
| Noise issue caused by a sticking valve in the spring-loaded radiator filler cap due to an oversized spring. | 17th Oct 1932 | Box 105 \ 1 scan0190 | |
| Request for costs related to work being done on 20/25HP car radiators. | 9th Dec 1932 | Box 105 \ 1 scan0191 | |
| Cost breakdown for the 20/25HP car radiator components and assembly. | 4th Jan 1933 | Box 105 \ 1 scan0192 | |
| Agreeing to the use of a drawn tube type radiator shutter on the 20/25 and suggesting the same for the Phantom II. | 4th Jan 1933 | Box 105 \ 1 scan0193 | |
| Standardisation of a soft copper washer to replace the rubber washer in the radiator cap. | 23th Sep 1932 | Box 105 \ 1 scan0194 | |
| Form for tracking the implementation and costs of standardizing a chassis part. | 17th Jan 1923 | Box 105 \ 1 scan0195 | |
| Breakdown of factory costs for 20/25 HP car radiators and shutters. | 9th Dec 1932 | Box 105 \ 1 scan0196 | |
| Tests for copper strip radiator matrices and a weight analysis of the 20/25 HP radiator. | 31th Jan 1933 | Box 105 \ 1 scan0197 | |
| The weight distribution, cost breakdown, and potential improvements for a radiator. | 31th Jan 1933 | Box 105 \ 1 scan0198 | |
| Review of radiator construction with a focus on reducing weight and cost. | 31th Jan 1933 | Box 105 \ 1 scan0199 | |
| List of weights for 25HP radiator and shutter parts with copper hexagon matrix tubes. | 1st Feb 1933 | Box 105 \ 1 scan0200 | |
| Radiator tubes and the standardisation of the Marston matrix for the 25 HP A.2. Series. | 21th Jun 1933 | Box 105 \ 1 scan0201 | |
| Specifying the Marston Mark III radiator matrix for the 20/25 HP car. | 27th Jun 1933 | Box 105 \ 1 scan0202 | |
| Standardisation of a Marston type radiator matrix for chassis parts. | 20th Jun 1933 | Box 105 \ 1 scan0203 | |
| Standardisation of chassis parts. | 30th Dec 1933 | Box 105 \ 1 scan0204 | |
| Performance and characteristics of loose shell radiators for the 20/25 HP model. | 14th Sep 1933 | Box 105 \ 1 scan0205 | |
| Requesting a report on the testing of two newly developed 20/25 radiators with a loose shell. | 11th Sep 1933 | Box 105 \ 1 scan0206 | |
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