| Description | Date | Identifier | |
| Supplier's (Greenwood & Batley Ltd.) response to reported failures in 'D' section radiator tubes. | 7th Jun 1920 | Box 38 \ 2 Scan102 | |
| Tests carried out on thermostat controls and bye-pass holes to prevent radiator freezing. | 9th Jun 1920 | Box 38 \ 2 Scan103 | |
| Continued note on engine temperature and the conditions under which a radiator might freeze. | 8th Jun 1920 | Box 38 \ 2 Scan104 | |
| Comparative times for engine water heat-up under no load with different thermostat and bye-pass configurations. | 26th Jun 1919 | Box 38 \ 2 Scan105 | |
| Confirmation to proceed with an order for a further 125 Marsden type radiators for the 40/50 chassis. | 26th Jun 1919 | Box 38 \ 2 Scan106 | |
| Parts fitted to experimental cars 4.EX and 6.EX. | 1st Jul 1920 | Box 38 \ 2 Scan107 | |
| Using copper versus brass tubing for radiators in the U.S.A. due to corrosion concerns. | 27th Jul 1920 | Box 38 \ 2 Scan108 | |
| Investigation into using copper instead of brass for radiator tubes due to water quality issues. | 27th Jul 1920 | Box 38 \ 2 Scan109 | |
| Unsuitability of brass radiator tubes in the Western US due to alkaline water, proposing tests and comparing materials. | 28th Jul 1920 | Box 38 \ 2 Scan110 | |
| Request to obtain Boilerine Tablets from the Shell Co. for preventing lime deposit and corrosion in radiators. | 29th Jul 1920 | Box 38 \ 2 Scan111 | |
| Issues with collapsing copper radiator tubes and advocating for the continued use of brass tubes. | 29th Jul 1920 | Box 38 \ 2 Scan112 | |
| Recommendation to adopt Ferodo bon-rest material instead of brass wearing strips on the 40/50 chassis bonnet. | 30th Jul 1920 | Box 38 \ 2 Scan113 | |
| Advantages and disadvantages of fitting a thermostat control, focusing on the risk of the radiator freezing. | 3rd Aug 1920 | Box 38 \ 2 Scan114 | |
| Questioning the reliability, cost, and implementation of a new thermostat control for water temperature. | 2nd Jul 1920 | Box 38 \ 2 Scan115 | |
| Laboratory report on corrosion tests of a brass tube in hard water and various chemical solutions. | 5th Aug 1920 | Box 38 \ 2 Scan116 | |
| Laboratory memo on corrosion tests for radiator tubes, comparing electrolytic copper, copper with arsenic, and brass. | 1st Aug 1920 | Box 38 \ 2 Scan117 | |
| Continuation page of a document concerning trouble with water. | 11th Aug 1920 | Box 38 \ 2 Scan118 | |
| Water loss in faulty radiators and a proposed solution. | 16th Aug 1920 | Box 38 \ 2 Scan119 | |
| From the Experimental Department questioning the necessity of bonnet shutters for cars used in America. | 21th Sep 1920 | Box 38 \ 2 Scan120 | |
| Recommending to stop using aero engine rubber hose on car engines due to poor durability compared to standard parts. | 27th Sep 1920 | Box 38 \ 2 Scan121 | |
| Component issues and requests for vehicles supplied to the American market. | 11th Nov 1920 | Box 38 \ 2 Scan122 | |
| Petrol systems, spring shackle clearances, and radiator materials. | 11th Nov 1920 | Box 38 \ 2 Scan123 | |
| Potential use of Monel metal as a superior alternative to nickel brass for certain vehicle parts, weighing quality against cost. | 23th Dec 1920 | Box 38 \ 2 Scan124 | |
| The superiority of a nickel-copper alloy over a zinc-based alloy for chassis construction. | 23th Dec 1920 | Box 38 \ 2 Scan125 | |
| Internal memorandum regarding a trial sample of All's Well Anti-Freezing Compound for production tests. | 10th Jan 1921 | Box 38 \ 2 Scan126 | |
| Letter advising against the use of thermostats in water circulation systems due to issues with alcohol-based antifreeze. | 28th Jan 1921 | Box 38 \ 2 Scan127 | |
| Cold weather engine cooling issues involving thermostats, radiators, and the use of radiator shutters. | 28th Jan 1921 | Box 38 \ 2 Scan128 | |
| Thermostat-controlled shutters and bypass systems for car radiators. | 28th Jan 1921 | Box 38 \ 2 Scan129 | |
| Proposal and ordering 12,000 tubes for experimental chassis radiators. | 4th Feb 1921 | Box 38 \ 2 Scan130 | |
| 'Winterfront' radiator shutters observed on cars in New York and available for purchase in the U.S.A. | 4th Feb 1921 | Box 38 \ 2 Scan131 | |
| Use of thermostats, radiator shutters, and anti-freeze in U.S.A. cars. | 29th Jan 1922 | Box 38 \ 2 Scan132 | |
| Radiator shutter controls, water temperature limits for alcohol coolant, and thermostat-operated shutters on American cars. | 14th Feb 1921 | Box 38 \ 2 Scan133 | |
| To R.R. of America discussing the use of thermostats versus hand-operated radiator shutters on the chassis. | 2nd Feb 1921 | Box 38 \ 2 Scan134 | |
| Design, issues, and alternatives for the thermostat and bypass system. | 15th Feb 1921 | Box 38 \ 2 Scan135 | |
| The design and placement of radiator louvres and their control system. | 15th Feb 1921 | Box 38 \ 2 Scan136 | |
| Confirming the decision to standardise thermostat-operated shutters rather than introduce a thermostat bypass. | 15th Feb 1921 | Box 38 \ 2 Scan137 | |
| Modifications to the 40/50 HP model to handle a lower grade of petrol. | 2nd Feb 1921 | Box 38 \ 2 Scan138 | |
| Continued discussion on heating the induction pipe for fuel vaporization and improving engine aesthetics. | 22th Feb 1921 | Box 38 \ 2 Scan139 | |
| Letter discussing thermostat-operated shutters, comparing American car solutions and considering a proprietary design. | 3rd Mar 1921 | Box 38 \ 2 Scan140 | |
| Comparison of different radiator thermostat and shutter systems, including Galli-ator and Columbia schemes. | 3rd Mar 1921 | Box 38 \ 2 Scan141 | |
| Radiator freezing issues and the proposal for developing automatic shutters to improve winter performance. | 3rd Mar 1921 | Box 38 \ 2 Scan142 | |
| Issues with the top radiator bracket being too springy on cars with high radiators. | 8th Mar 1921 | Box 38 \ 2 Scan143 | |
| Potential cost-saving benefits of using American extruded copper radiator tubes over brass drawn tubes. | 24th Mar 1921 | Box 38 \ 2 Scan144 | |
| Redesigning the 40/50 HP radiator suspension brackets from drop forgings to sheet metal. | 31th Mar 1921 | Box 38 \ 2 Scan145 | |
| Testing extruded copper tubes for radiators as a cheaper alternative to brass drawn tubes. | 11th Apr 1921 | Box 38 \ 2 Scan146 | |
| Supply and cost comparison of extruded copper tubes for radiators. | 14th Apr 1921 | Box 38 \ 2 Scan147 | |
| Proposing an experiment to reduce thermostat 'hunting' by repositioning it. | 14th Apr 1921 | Box 38 \ 2 Scan148 | |
| Inquiry regarding the need for a larger radiator for a chassis to handle a 16-mile climb in 120°F temperatures without boiling. | 9th May 1921 | Box 38 \ 2 Scan149 | |
| Extract concerning U.S.A. complaints about vehicle starting and running issues due to low-grade fuel and cold winters. | 8th Jun 1921 | Box 38 \ 2 Scan150 | |
| Engine modifications related to carburetter position and induction system heating. | 8th Jun 1921 | Box 38 \ 2 Scan151 | |
| Improving engine starting by using a small additional carburetter instead of a choke. | 8th Jun 1921 | Box 38 \ 2 Scan152 | |
| Design improvement for the new 20 HP chassis. | 1st Jun 1921 | Box 38 \ 2 Scan153 | |
| Comparing the anti-tarnishing properties of Monel Metal and nickel silver for radiator construction. | 24th Jun 1921 | Box 38 \ 2 Scan154 | |
| Extruded copper tubes for radiators, including pricing and manufacturing methods. | 8th Aug 1921 | Box 38 \ 2 Scan155 | |
| Sourcing of standard hand-operated louvres for the 40/50 HP model. | 11th Aug 1921 | Box 38 \ 2 Scan156 | |
| On the testing, cost, and potential UK sourcing of extruded copper tubes for radiators. | 20th Aug 1921 | Box 38 \ 2 Scan157 | |
| Experimental radiator cowl to improve cooling on the 40/50 HP armoured car for sand tests. | 1st Aug 1921 | Box 38 \ 2 Scan158 | |
| Customer complaints about engine overheating and radiator water loss. | 25th Aug 1921 | Box 38 \ 2 Scan159 | |
| Leaking radiator tubes caused by the omission of a rubber washer at the rear end. | 2nd Sep 1921 | Box 38 \ 2 Scan160 | |
| Issue of water loss due to boiling during hill climbing and potential solutions. | 9th Sep 1921 | Box 38 \ 2 Scan161 | |
| Letter discussing the use of extruded copper tubes in radiators to address engine overheating issues. | 12th Sep 1921 | Box 38 \ 2 Scan162 | |
| Proposing the standardisation of a smaller pulley to resolve issues of radiator water boiling at high altitudes. | 19th Sep 1921 | Box 38 \ 2 Scan163 | |
| The testing of a radiator cowl designed to prevent water loss from boiling in experimental and armoured cars. | 24th Sep 1921 | Box 38 \ 2 Scan164 | |
| Telegram received by telephone regarding the results of cowlings over radiator fans on a 40/50 chassis. | 23th Aug 1918 | Box 38 \ 2 Scan165 | |
| Confirmation of a telegram regarding a meeting and suggestions for a USA winter programme. | 10th Oct 1921 | Box 38 \ 2 Scan166 | |
| Engine overheating issues in the Swiss Alps and proposed solutions. | 14th Oct 1921 | Box 38 \ 2 Scan167 | |
| Internal memorandum regarding comparative testing on the efficiency of extruded copper tubes versus brass tubes for radiators. | 12th Sep 1921 | Box 38 \ 2 Scan168 | |
| Test results comparing a standard radiator with a radiator fitted with copper tubes. | 13th Jan 1922 | Box 38 \ 2 Scan169 | |
| Radiator tests comparing a standard radiator to a 'Sofr' radiator, with temperature readings recorded at various intervals. | 7th Feb 1922 | Box 38 \ 2 Scan170 | |
| Comparative test measuring the velocity of air passing through the radiators of the 40/50 and Goshawk II engines. | 30th May 1922 | Box 38 \ 2 Scan171 | |
| Tests on a Goshawk engine to reduce water loss and comparing its performance to the 40/50 model. | 1st May 1922 | Box 38 \ 2 Scan172 | |
| Comparison of engine overheating characteristics between the 40/50 and Goshawk models, including thermometer reliability. | 30th May 1922 | Box 38 \ 2 Scan173 | |
| Dynamometer testing of a Goshawk radiator and a 40/50 car's cooling performance. | 9th Jun 1922 | Box 38 \ 2 Scan174 | |
| Inquiry into the effects of engine overheating due to water loss from a leak and the potential for an alarm signal. | 9th Jun 1922 | Box 38 \ 2 Scan175 | |
| Technical memorandum discussing experiments on the 40/50 engine's cooling system to prevent water loss. | 5th Jun 1922 | Box 38 \ 2 Scan176 | |
| Comparative tests of water loss from a car's radiator under boiling conditions. | 12th Aug 1922 | Box 38 \ 2 Scan177 | |
| Modifications to a chassis for Mr. Riedemann to prevent engine boiling, including fitting a larger radiator. | 12th Aug 1922 | Box 38 \ 2 Scan178 | |
| Short handwritten note asking for an opinion on a referenced item. | 9th Oct 1922 | Box 38 \ 2 Scan179 | |
| Directive to fit radiator louvres and thermometers to all 40/50s and Goshawk cars to maintain high engine temperatures. | 1st Sep 1922 | Box 38 \ 2 Scan180 | |
| Suitability of a deeper radiator and larger fan for cars intended for use in Switzerland and India. | 10th Sep 1922 | Box 38 \ 2 Scan181 | |
| Instruction sheet for Mr. Hives regarding an experimental radiator from The Excelsior Radiator Co. | 16th Jan 1923 | Box 38 \ 2 Scan182 | |
| Sample radiator tube made by Electro Deposition compared to existing manufacturing processes. | 26th Jan 1923 | Box 38 \ 2 Scan183 | |
| Sample radiators from Excelsior Radiator Company and a request to compare them with the existing supplier, Marstons. | 31th Jan 1923 | Box 38 \ 2 Scan184 | |
| Standardisation proposal to change radiator tank corners from a radius to sharp corners to improve appearance. | 21th Mar 1923 | Box 38 \ 2 Scan185 | |
| Review document for a proposed modification to a chassis brake corner part. | 25th Feb 1922 | Box 38 \ 2 Scan186 | |
| Containing an extract from a letter concerning sample radiator tubes, their quality, and strength. | 4th May 1923 | Box 38 \ 2 Scan187 | |
| Follow-up from The Excelsior Motor Radiator Co. of Leeds, regarding the final test status of two sample radiators. | 3rd May 1923 | Box 38 \ 2 Scan188 | |
| Tests to prevent water loss from a radiator due to boiling. | 21th Aug 1923 | Box 38 \ 2 Scan189 | |
| Tests conducted to prevent water loss from engine radiators due to boiling. | 1st Aug 1923 | Box 38 \ 2 Scan190 | |
| Modifications to the radiator and cooling system, including water pipes, steam separators, and filler caps. | 12th Jul 1923 | Box 38 \ 2 Scan191 | |
| Testing a pressurised cooling system to prevent water from boiling readily. | 9th Sep 1923 | Box 38 \ 2 Scan192 | |
| With a diagram suggesting a new method for applying a scheme to radiators. | 12th Jul 1923 | Box 38 \ 2 Scan193 | |
| Increasing the boiling point of water in a radiator by subjecting it to pressure. | 12th Jul 1923 | Box 38 \ 2 Scan194 | |
| Testing a pressurized radiator system to increase the boiling point of water. | 12th Jul 1923 | Box 38 \ 2 Scan195 | |
| Page showing boiling points and engine temperature data tables. | 18th Jul 1923 | Box 38 \ 2 Scan196 | |
| Road tests on engine cooling performance during a hill climb. | 12th Jul 1923 | Box 38 \ 2 Scan197 | |
| Technical data sheet comparing specifications for Goshawk-II and 40/50 HP radiators. | 14th Sep 1923 | Box 38 \ 2 Scan198 | |
| Specifications for the 40/50 model's radiator and fan, including water capacity and pulley diameters. | 29th Sep 1923 | Box 38 \ 2 Scan199 | |
| Modifying the chassis cooling system for better performance in cold weather. | 21th Nov 1923 | Box 38 \ 2 Scan200 | |
| Test data sheet recording the temperature of air at the rear of the fan in relation to water temperature at speeds of 25 and 45 mph. | 15th Oct 1923 | Box 38 \ 2 Scan201 | |
| | | | |