| Description | Date | Identifier | |
| Advising against the use of Sodium Phosphate in radiators on customers' cars. | 2nd Dec 1929 | Box 27a \ 3 Scan092 | |
| The decision to not recommend the use of sodium phosphate due to a tendency to cause priming. | 3rd Dec 1929 | Box 27a \ 3 Scan093 | |
| Radiator blocking, proposing modifications to the use of sodium phosphate as a corrosion inhibitor. | 1st Dec 1929 | Box 27a \ 3 Scan094 | |
| Discontinuation of the use of Sodium Phosphate. | 4th Dec 1929 | Box 27a \ 3 Scan095 | |
| Outlining an experimental process for protecting cylinder block water jackets by oxidation. | 4th Dec 1929 | Box 27a \ 3 Scan096 | |
| Methods and modifications for chromium plating radiators. | 12th Jul 1929 | Box 27a \ 3 Scan097 | |
| Recommending a change to the red warning lamp operation on the Phantom II to prevent water loss from boiling. | 7th Dec 1929 | Box 27a \ 3 Scan098 | |
| Progress report on the chromium plating job, comparing the quality and promises of the Chromo Process Syndicate versus Canning's system. | 11th Dec 1929 | Box 27a \ 3 Scan099 | |
| Practicalities of chromium plating on radiators, comparing a double plating process on brass sheet to direct plating on nickel silver. | 17th Dec 1929 | Box 27a \ 3 Scan100 | |
| Mr. Royce's proposed scheme for chromium plating 40/50 HP radiators. | 17th Dec 1929 | Box 27a \ 3 Scan101 | |
| Practice of chromium plating on brass versus nickel silver. | 17th Dec 1929 | Box 27a \ 3 Scan102 | |
| Letter from Harcourts Limited regarding difficulties and price increases for chromium plating brass radiator shells. | 16th Dec 1929 | Box 27a \ 3 Scan103 | |
| Issues with cylinder head tubes and the discontinuation of Sodium Phosphate in the cooling system due to water frothing. | 1st Jan 1930 | Box 27a \ 3 Scan104 | |
| Water loss and cylinder head tube trouble on chassis 56-WR, likely caused by excessive Sodium Phosphate. | 1st Jan 1930 | Box 27a \ 3 Scan105 | |
| Tests conducted on water pump cavitation for radiators. | 10th Jan 1930 | Box 27a \ 3 Scan106 | |
| Analysis of water circulation in a radiator, focusing on cavitation, hydraulic restriction, and maximum flow. | 10th Jan 1930 | Box 27a \ 3 Scan107 | |
| The performance of a large gap radiator, comparing it to previous models and detailing tests on water pump flow restrictions. | 10th Jan 1930 | Box 27a \ 3 Scan108 | |
| Radiator circulation issues, back pressure, and observations of water loss from choked radiators. | 10th Jan 1930 | Box 27a \ 3 Scan109 | |
| Summary of results regarding radiator and cooling system performance, including comparisons with Chrysler and potential improvements for the Phantom II. | 10th Jan 1930 | Box 27a \ 3 Scan110 | |
| Comparison table of radiator specifications for various car models. | 21th Jan 1930 | Box 27a \ 3 Scan111 | |
| Test procedure document for vehicle radiators. | 21th Jan 1930 | Box 27a \ 3 Scan112 | |
| Diagrammatic views of all radiator suspensions used on 40/50 HP cars. | 31th Jan 1922 | Box 27a \ 3 Scan113 | |
| Radiator dimensions, cooling performance, and the effects of bonnet ventilation. | 4th Feb 1930 | Box 27a \ 3 Scan114 | |
| Issue of radiator jellying on the 40/50 model and proposing a solution with a Diabolo rubber support. | 5th Feb 1930 | Box 27a \ 3 Scan115 | |
| Letter from W. Canning & Co Ltd regarding a plating solution and proposing a new 'Forward' Plating Barrel complete with an estimate. | 21th Feb 1930 | Box 27a \ 3 Scan116 | |
| Tender from W. Canning & Co Ltd for electro-plating plant and materials. | 21th Feb 1930 | Box 27a \ 3 Scan117 | |
| Continuation page of a quotation from W. Canning & Co Ltd for nickel hooks and a clock face. | 9th Jan 1930 | Box 27a \ 3 Scan118 | |
| Blueprint diagram of a radiator test rig with dimensions and test results. | 9th Jan 1930 | Box 27a \ 3 Scan119 | |
| Experiments with Ethylene Glycol to reduce radiator corrosion in Phantom II and Trials cars. | 25th Feb 1930 | Box 27a \ 3 Scan120 | |
| Instructions on the use of Ethylene Glycol in a car's cooling system to prevent corrosion and freezing. | 8th Mar 1930 | Box 27a \ 3 Scan121 | |
| Paper on radiator efficiency and a new chassis testing plant. | 20th Jun 1930 | Box 27a \ 3 Scan122 | |
| Letter from Gallay Radiator Co. Ltd. offering a free sample of their patent tube block system for testing purposes. | 27th Aug 1930 | Box 27a \ 3 Scan123 | |
| Letter from Gallay Radiator Co. Ltd. enclosing a previously omitted Royal Aircraft Factory Report. | 28th Aug 1930 | Box 27a \ 3 Scan124 | |
| Synopsis of a report comparing the performance of a Gallay radiator section against a round tube type for automobile and aero use. | 28th Aug 1930 | Box 27a \ 3 Scan125 | |
| Wind tunnel tests of Gallay radiators for a 200 HP Hispano Suiza Engine on a 'Dolphin' machine. | 28th Aug 1930 | Box 27a \ 3 Scan126 | |
| Comparison table of radiator/cooler specifications for different configurations. | 29th Aug 1930 | Box 27a \ 3 Scan127 | |
| Letter to The Gallay Radiator Co. Ltd. requesting a sample section of a radiator matrix for testing. | 29th Aug 1930 | Box 27a \ 3 Scan128 | |
| Request to Gallay Radiator Co Ltd for a sample section of a radiator matrix. | 29th Aug 1920 | Box 27a \ 3 Scan129 | |
| Letter from Gallay Radiator Co. Ltd. about forwarding two sample 4-inch sections and proposing to fit a sample block to a radiator. | 29th Aug 1930 | Box 27a \ 3 Scan130 | |
| Letter from Gallay Radiator Co. Ltd. regarding the strength and testing of their radiator systems. | 30th Aug 1930 | Box 27a \ 3 Scan131 | |
| Requesting the despatch of a radiator for modification by Gallay Radiator Co. Ltd. | 1st Sep 1930 | Box 27a \ 3 Scan132 | |
| Letter to Gallay Radiator Co. Ltd. regarding the testing of radiator samples and requesting a quote for modification and bulk supply. | 1st Sep 1930 | Box 27a \ 3 Scan133 | |
| Letter from Gallay Radiator Co. Ltd. promising to supply a sample radiator block and provide a quote for larger quantities. | 4th Sep 1930 | Box 27a \ 3 Scan134 | |
| Inquiring about the increased cooling value of the Anderton Brown radiator tube. | 20th Sep 1930 | Box 27a \ 3 Scan135 | |
| Letter to The Gallay Radiator Co. Ltd. arranging collection of a radiator. | 22th Sep 1930 | Box 27a \ 3 Scan136 | |
| Letter from Gallay Radiator Co. Ltd. regarding a sample of a special type of chromium-plated radiator shutter louvre. | 26th Sep 1930 | Box 27a \ 3 Scan137 | |
| Letter to The Gallay Radiator Co. Ltd. rejecting their sample radiator shutter. | 27th Sep 1930 | Box 27a \ 3 Scan138 | |
| Letter from Gallay Radiator Co. Ltd. regarding a sample of radiator shutter louvres for future reference. | 29th Sep 1930 | Box 27a \ 3 Scan139 | |
| Letter to The Gallay Radiator Co. Ltd. arranging a visit to inspect a radiator matrix. | 30th Sep 1930 | Box 27a \ 3 Scan140 | |
| Relative merits of Anderton Brown patent radiator tubes compared to standard tubes. | 8th Oct 1930 | Box 27a \ 3 Scan141 | |
| Copy of a letter responding to an inquiry about Anderton Brown Patent Radiator Tubes. | 29th Sep 1930 | Box 27a \ 3 Scan142 | |
| Report comparing the performance of hexagonal and round radiator tubes, including heat dissipation and water flow. | 29th Sep 1930 | Box 27a \ 3 Scan143 | |
| Technical letter discussing the comparative performance of hexagonal and round radiator tubes for engine cooling systems. | 14th Oct 1930 | Box 27a \ 3 Scan144 | |
| Letter to The Gallay Radiator Co. Ltd. regarding the testing of a radiator matrix and an inquiry about a newer, more efficient model. | 14th Oct 1930 | Box 27a \ 3 Scan145 | |
| Letter from Gallay Radiator Co. Ltd. discussing radiator tube efficiency, a visit to their Paris works, and a price quotation. | 15th Oct 1930 | Box 27a \ 3 Scan146 | |
| Continuation sheet from Gallay Radiator Company Ltd. arranging an appointment. | 11th Oct 1930 | Box 27a \ 3 Scan147 | |
| Short internal memorandum from ROY to Hs. following a conversation and enclosing a copy of a letter. | 11th Oct 1930 | Box 27a \ 3 Scan148 | |
| Request for information on a new radiator design shown by the A.T. Speedometer company at the Paris Salon. | 11th Oct 1930 | Box 27a \ 3 Scan149 | |
| Forwarding information about a radiator cooling scheme from the A.T. Speedometer Company of Paris. | 1st Nov 1930 | Box 27a \ 3 Scan150 | |
| New radiator cooling system seen at a show. | 28th Oct 1930 | Box 27a \ 3 Scan151 | |
| Seeking clarification on a debit note from the Gallay Radiator Company. | 16th Dec 1930 | Box 27a \ 3 Scan152 | |
| Tested radiator matrix from the Galley Radiator Co. which was found to be unsatisfactory. | 17th Dec 1930 | Box 27a \ 3 Scan153 | |
| Standardisation of the radiator medallion colour from red to black and the finish of the starting handle tube cover. | 18th Dec 1930 | Box 27a \ 3 Scan154 | |
| Design and color of the radiator and starting handle tube medallions. | 22th Dec 1930 | Box 27a \ 3 Scan155 | |
| Requesting a formal requisition to cover a £10 debit for expenses in a transaction with Gallay Radiator. | 22th Dec 1930 | Box 27a \ 3 Scan156 | |
| Payment to Gallay Co. for out-of-pocket expenses for a radiator sent for testing. | 23th Dec 1930 | Box 27a \ 3 Scan157 | |
| Confirming payment for out-of-pocket expenses to the Gallay Radiator Company. | 24th Dec 1930 | Box 27a \ 3 Scan158 | |
| Returned radiator matrix from the Gallay Radiator Co. with the recommendation to scrap it. | 12th Jan 1931 | Box 27a \ 3 Scan159 | |
| Inquiry to Boulton & Paull Ltd. regarding wind tunnel testing of car radiators. | 10th Feb 1931 | Box 27a \ 3 Scan160 | |
| Dimensioned drawing of a radiator. | 12th Feb 1931 | Box 27a \ 3 Scan161 | |
| Letter from Boulton & Paul Limited responding to an enquiry for wind channel work on the efficiency of radiators. | 12th Feb 1931 | Box 27a \ 3 Scan162 | |
| Letter to Messrs. Boulton & Paull, Ltd. arranging a meeting to discuss tests. | 14th Feb 1931 | Box 27a \ 3 Scan163 | |
| Message arranging an appointment to discuss radiator tests. | 16th Feb 1931 | Box 27a \ 3 Scan164 | |
| Telegram from Boulton to Roycar in Derby confirming a convenient time for the following afternoon. | 18th Feb 1931 | Box 27a \ 3 Scan165 | |
| Report discussing the feasibility of using a wind tunnel for testing car radiator efficiency. | 17th Feb 1931 | Box 27a \ 3 Scan166 | |
| Proposal to use a dynamometer and a large ventilating fan rig to test car radiators. | 21th Feb 1931 | Box 27a \ 3 Scan167 | |
| Letter from Boulton & Paul Limited requesting a delay in providing sketches for a Wind Blast Installation for radiator tests. | 21th Feb 1931 | Box 27a \ 3 Scan168 | |
| Letter to Messrs. Boulton & Paull Ltd. regarding information awaited on a wind-blast installation. | 3rd Mar 1931 | Box 27a \ 3 Scan169 | |
| Letter from Boulton & Paul Ltd. proposing a uniform air jet system for testing car radiator efficiency. | 9th Mar 1931 | Box 27a \ 3 Scan170 | |
| Proposed air jet design for testing car radiator cooling. | 7th Feb 1921 | Box 27a \ 3 Scan171 | |
| Drawing and calculations for a 40/50 HP radiator component. | 16th Mar 1934 | Box 27a \ 3 Scan172 | |
| Blueprint for a proposed arrangement of a car testing plant. | 28th Sep 1937 | Box 27a \ 3 Scan173 | |
| From Heenan & Froude, Ltd. to Mr. Hayes regarding a car tester. | 18th Mar 1931 | Box 27a \ 3 Scan174 | |
| Letter from The Airscrew Company offering to waive the design fee and manufacture a custom four-bladed screw. | 18th Mar 1931 | Box 27a \ 3 Scan175 | |
| Letter to Messrs Boulton & Paul Ltd regarding blueprints for a required test fan and the calibration of the rig. | 11th Mar 1931 | Box 27a \ 3 Scan176 | |
| The specifications and quotation for a proposed test rig for car radiators. | 11th Mar 1931 | Box 27a \ 3 Scan177 | |
| Letter regarding the procurement of an airscrew from The Airscrew Company, Ltd. for a car radiator test rig. | 19th Mar 1931 | Box 27a \ 3 Scan178 | |
| Letter to Boulton & Paul Ltd. requesting clarification on two points regarding a rig sketch and horsepower requirements. | 26th Mar 1931 | Box 27a \ 3 Scan179 | |
| Two alternative power options for a radiator testing rig. | 26th Mar 1931 | Box 27a \ 3 Scan180 | |
| Calculations for horsepower required for an air jet system. | 31th Mar 1931 | Box 27a \ 3 Scan181 | |
| Letter from Boulton & Paul discussing motor horsepower, velocity, and the power factor formula for a jet. | 31th Mar 1931 | Box 27a \ 3 Scan182 | |
| Letter to Messrs Boulton & Paul regarding the reconciliation of fan power calculations. | 8th Apr 1931 | Box 27a \ 3 Scan183 | |
| Letter from Boulton & Paul concerning power factor calculations for a wind tunnel installation, correcting a previous oversight. | 13th Apr 1931 | Box 27a \ 3 Scan184 | |
| Letter from the Air Ministry following up on a query about a fuel sample from America. | 3rd Sep 1932 | Box 27a \ 4 Scan001 | |
| From Hs/Yng to Roy, requesting an order for 80 gallons of Methanol from I.C.I. Ltd. | 8th Sep 1932 | Box 27a \ 4 Scan002 | |
| Cover letter to the Air Ministry regarding a 'safety' fuel sample and correspondence with Standard Oil. | 12th Sep 1932 | Box 27a \ 4 Scan003 | |
| Querying the purchase and need for a requisition for a delivery of Aviation Spirit. | 13th Sep 1932 | Box 27a \ 4 Scan004 | |
| Report to Shell-Mex and B.P. Ltd on the quality of recent D.T.D.134 fuel samples. | 13th Sep 1932 | Box 27a \ 4 Scan005 | |
| Letter to Mr. Hives attaching test reports for doped and undoped fuel samples. | 8th Sep 1932 | Box 27a \ 4 Scan006 | |
| Test report on the anti-detonation value of an undoped fuel sample. | 6th Sep 1932 | Box 27a \ 4 Scan007 | |
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