| Description | Date | Identifier | |
| List of potential modifications and improvements for a trials car for the American market. | 1st Mar 1920 | Box 78 \ 1 scan0040 | |
| The replacement of parts on the 2.EX 10,000 miles test car with improved versions. | 8th Mar 1920 | Box 78 \ 1 scan0041 | |
| Extract concerning a report on American chassis parts and the decision to replace thermometers with thermostat controls. | 16th Mar 1920 | Box 78 \ 1 scan0042 | |
| Laboratory analysis of a thermostat expanding reservoir's capacity and liquid composition. | 18th Mar 1920 | Box 78 \ 1 scan0043 | |
| Analysis and test report on sylphon tubes used for thermostat control. | 23th Mar 1920 | Box 78 \ 1 scan0044 | |
| Continuation page of a report discussing a variation in a valve fitting. | 23th Mar 1920 | Box 78 \ 1 scan0045 | |
| Extract listing experimental parts fitted to 40/50 chassis. | 15th Apr 1920 | Box 78 \ 1 scan0046 | |
| Suggesting the adoption of an india rubber water hose joint for the thermostat's water connections. | 19th Apr 1920 | Box 78 \ 1 scan0047 | |
| Extract listing parts and modifications to be fitted to a car for West Wittering. | 19th Apr 1920 | Box 78 \ 1 scan0048 | |
| The standardisation and urging the delivery of sylphon tubes for thermostat controls. | 21th Apr 1920 | Box 78 \ 1 scan0049 | |
| Test report on a venturi flowmeter, measuring water flow at various engine revolutions. | 21th Apr 1920 | Box 78 \ 1 scan0050 | |
| Water flow test results at various engine speeds, comparing performance with and without a thermostat. | 21th Apr 1920 | Box 78 \ 1 scan0051 | |
| Order office note for a radiator thermometer with tubing for the Cambridge Scientific Instrument Company. | 22th Apr 1920 | Box 78 \ 1 scan0052 | |
| The measurement of water flow through an engine with and without a thermostat fitted. | 23th Apr 1920 | Box 78 \ 1 scan0053 | |
| On thermostat control for water temperature, confirming performance and requesting corrected drawings be sent to America. | 26th Apr 1920 | Box 78 \ 1 scan0054 | |
| Delivery of thermostats for chassis water circulation. | 28th Apr 1920 | Box 78 \ 1 scan0055 | |
| The standardisation of a 40/50 HP thermostat. | 12th May 1920 | Box 78 \ 1 scan0056 | |
| The standardisation sheets for the 40/50 HP thermostat. | 17th May 1920 | Box 78 \ 1 scan0057 | |
| Upcoming improvements and modifications for American-built cars. | 21th May 1920 | Box 78 \ 1 scan0058 | |
| Proposed modification to the chassis top water connections involving the adoption of a thermostat control. | 22th May 1920 | Box 78 \ 1 scan0059 | |
| Urgent need to standardise the thermostat control for water temperature. | 22th May 1920 | Box 78 \ 1 scan0060 | |
| Standardisation of the chassis thermostat and the supply of Sylphon Tubes. | 27th May 1920 | Box 78 \ 1 scan0061 | |
| Test results for thermostat performance with different diaphragm hole sizes. | 28th May 1920 | Box 78 \ 1 scan0062 | |
| Standardization of the thermostat, its body, and associated pipe connections. | 2nd Jun 1920 | Box 78 \ 1 scan0063 | |
| Tests on thermostat controls and bye-pass holes to prevent radiator freezing in cold climates. | 1st Jun 1920 | Box 78 \ 1 scan0064 | |
| Continuation page of a report discussing engine temperature and the conditions for radiator freezing. | 8th Jun 1920 | Box 78 \ 1 scan0065 | |
| Comparison of engine water heat-up times with different thermostat bye-pass settings. | 12th Jun 1920 | Box 78 \ 1 scan0066 | |
| Letter chasing delivery of the Thermostat, which has reached the standardisation stage. | 12th Jun 1920 | Box 78 \ 1 scan0067 | |
| Attaching a copy of a cable from Springfield concerning thermostats. | 17th Jun 1920 | Box 78 \ 1 scan0068 | |
| Copy of a cablegram received from Springfield with decoded messages. | 14th Jun 1920 | Box 78 \ 1 scan0069 | |
| Correct spanners for the shock absorber and thermostat nuts. | 18th Jun 1920 | Box 78 \ 1 scan0070 | |
| Implementation of a new thermostat control and a new short brake lever. | 21th Jun 1920 | Box 78 \ 1 scan0071 | |
| List of experimental parts fitted to Chassis 6.EX. | 22th Jun 1920 | Box 78 \ 1 scan0072 | |
| The design of a pipe for the chassis thermostat, awaiting Mr. Royce's approval for a change from union nuts to rubber joints. | 23th Jun 1920 | Box 78 \ 1 scan0073 | |
| Request for a cost estimate for fitting a thermostat. | 15th Jul 1920 | Box 78 \ 1 scan0074 | |
| Questioning the reliability, cost, and implementation of a new thermostat for water temperature control. | 2nd Jul 1920 | Box 78 \ 1 scan0075 | |
| Redesign and repositioning of the instrument board for Chassis 6.EX. | 17th Jul 1920 | Box 78 \ 1 scan0076 | |
| Suitability of an American Foxborough Thermometer and its necessity when a thermostat is fitted. | 19th Jul 1920 | Box 78 \ 1 scan0077 | |
| The necessity of a water temperature thermometer for preventing radiator freezing and boiling. | 19th Jul 1920 | Box 78 \ 1 scan0078 | |
| Shipment of thermostats and a cancelled order of thermometers. | 23th Jul 1920 | Box 78 \ 1 scan0079 | |
| The cancellation of thermometer fittings upon the standardization of the thermostat. | 3rd Aug 1920 | Box 78 \ 1 scan0080 | |
| Risk of radiators freezing with thermostat control and the decision to fit them from chassis 1500. | 8th Aug 1920 | Box 78 \ 1 scan0081 | |
| Raising concerns about introducing a new thermostat control for water temperature. | 2nd Jul 1920 | Box 78 \ 1 scan0082 | |
| The completed standardisation sheet for a thermostat control for water temperature. | 11th Aug 1920 | Box 78 \ 1 scan0083 | |
| Standardisation report for a thermostat control for water temperature. | 29th Jun 1920 | Box 78 \ 1 scan0084 | |
| Thermostat control for water temperature, measuring water flow through an engine. | 23th Apr 1920 | Box 78 \ 1 scan0085 | |
| Tests conducted on a thermostat, focusing on the bye-pass hole's role in preventing radiator freezing. | 1st Jun 1920 | Box 78 \ 1 scan0086 | |
| Continued memo on engine temperatures and the conditions under which a radiator might freeze. | 6th Aug 1920 | Box 78 \ 1 scan0087 | |
| Report on an attached letter from the American division. | 6th Aug 1920 | Box 78 \ 1 scan0088 | |
| Letter regarding a potential thermostat design change and the resulting implications for existing materials and tooling. | 21th Jul 1920 | Box 78 \ 1 scan0089 | |
| To Mr. Johnson discussing production delays, design change approvals, and requesting experimental reports. | 21th Jul 1920 | Box 78 \ 1 scan0090 | |
| To Mr. Johnson regarding the process and importance of communicating and documenting design alterations and standardization sheets. | 1st Jun 1920 | Box 78 \ 1 scan0091 | |
| Introduction of thermostat control, scrapping existing parts, and new brake lever drawings. | 1st Jun 1920 | Box 78 \ 1 scan0092 | |
| Requesting inspection of thermostats received from America to ensure they match the drawings. | 23th Aug 1920 | Box 78 \ 1 scan0093 | |
| Parts to be scrapped or transferred for the Thermostat Control on the 40/50 chassis 1251. | 25th Aug 1920 | Box 78 \ 1 scan0094 | |
| Thermostats and thermometers for chassis to be produced in America. | 27th Aug 1920 | Box 78 \ 1 scan0095 | |
| Fitting of thermostats versus thermometers, noting the unreliability of the latter. | 9th Sep 1920 | Box 78 \ 1 scan0096 | |
| Telegram confirming thermometers are not to be a standard fitting when thermostats are used, to avoid extra complication. | 3rd Sep 1920 | Box 78 \ 1 scan0097 | |
| Cable communications regarding incorrectly dimensioned sylphon thermostat parts and proposed alterations. | 4th Sep 1920 | Box 78 \ 1 scan0098 | |
| Change in chassis number for the introduction of the thermostat on top water connections. | 7th Sep 1920 | Box 78 \ 1 scan0099 | |
| The provision of optional thermometer fittings for thermostat engines. | 21th Sep 1928 | Box 78 \ 1 scan0100 | |
| Complications and advisability of fitting thermometers to engines with thermostats. | 22th Sep 1920 | Box 78 \ 1 scan0101 | |
| Cost analysis for the addition of a thermostat to the water system. | 28th Sep 1920 | Box 78 \ 1 scan0102 | |
| The cause of an engine thud as a loose front cylinder block and outlining planned works and parts delivery. | 14th Oct 1920 | Box 78 \ 1 scan0103 | |
| Thermostat control of water circulation for the 40/50 HP, 'Buzzard', and 'Vulture' models. | 18th Oct 1920 | Box 78 \ 1 scan0104 | |
| Testing a new model feature for winter conditions in various countries. | 18th Oct 1920 | Box 78 \ 1 scan0105 | |
| Experimental car being prepared with new parts for winter testing in the U.S.A. | 4th Nov 1920 | Box 78 \ 1 scan0106 | |
| Standardisation of an Ignition Tube Bracket N.3794 for the 40/50 Chassis. | 4th Jan 1921 | Box 78 \ 1 scan0107 | |
| Thermostat settings and Sylphon Tube dimensions for the 40/50 Chassis. | 5th Jan 1921 | Box 78 \ 1 scan0108 | |
| The standardization of the bye-pass hole on the thermostat valve. | 26th Jan 1921 | Box 78 \ 1 scan0109 | |
| Failures in Cambridge Thermometers and a comparison with a superior Foxboro' Company instrument. | 1st Feb 1921 | Box 78 \ 1 scan0110 | |
| Fitting of a more reliable thermometer to operate radiator shutters. | 10th Feb 1921 | Box 78 \ 1 scan0111 | |
| The use of thermostats, radiator shutters, and anti-freeze in the U.S.A. | 2nd Feb 1921 | Box 78 \ 1 scan0112 | |
| Note on radiator shutter control to prevent alcohol loss, comparing with thermostat-operated shutters on American cars. | 2nd Feb 1921 | Box 78 \ 1 scan0113 | |
| Design and issues of the engine thermostat system and its bypass. | 15th Feb 1921 | Box 78 \ 1 scan0114 | |
| The design and placement of radiator louvres and shutters. | 15th Feb 1921 | Box 78 \ 1 scan0115 | |
| Standardisation of thermostat-operated shutters and the use of a thermometer. | 15th Feb 1921 | Box 78 \ 1 scan0116 | |
| Thermostats, attaching a letter from America for review and comment. | 15th Feb 1921 | Box 78 \ 1 scan0117 | |
| Letter discussing the inadvisability of using thermostats on the water circulation system due to issues with alcohol-based antifreeze. | 28th Jan 1921 | Box 78 \ 1 scan0118 | |
| To Mr. Claude Johnson discussing cold weather running issues such as alcohol loss, radiator freezing, and carburation problems. | 28th Jan 1921 | Box 78 \ 1 scan0119 | |
| Thermostat-controlled shutters and cooling systems, comparing American designs with a proposed company design. | 28th Jan 1921 | Box 78 \ 1 scan0120 | |
| Use of thermostats versus hand-operated shutters on radiators. | 2nd Feb 1921 | Box 78 \ 1 scan0121 | |
| Letter discussing thermostat-operated shutters, comparing systems on American cars like Hupmobile and Packard. | 3rd Mar 1921 | Box 78 \ 1 scan0122 | |
| The operation and comparison of different radiator shutter and thermostat systems. | 3rd Mar 1921 | Box 78 \ 1 scan0123 | |
| Radiator freezing issues and the proposal for an automatic shutter system. | 3rd Mar 1921 | Box 78 \ 1 scan0124 | |
| Letter from the American branch discussing thermostat shutters and oil pressure operated Galli-ators for existing cars. | 5th Mar 1921 | Box 78 \ 1 scan0125 | |
| Suggesting an experimental change to the thermostat's location to reduce hunting in the apparatus. | 1st Apr 1921 | Box 78 \ 1 scan0126 | |
| Fitting of thermostats to American cars and the differing preferences between the Derby and Springfield plants. | 25th Apr 1921 | Box 78 \ 1 scan0127 | |
| Criticisms from owners regarding the removal of thermometers from cars fitted with thermostat systems. | 24th Aug 1921 | Box 78 \ 1 scan0128 | |
| Standardisation of fitting Foxboro' thermometers due to customer demand and issues with the Cambridge model. | 9th Sep 1921 | Box 78 \ 1 scan0129 | |
| Customer requests for thermometers on cars with thermostats, suggesting standardizing the fitting with a Foxboro' Thermometer due to issues with the Cambridge model. | 9th Sep 1921 | Box 78 \ 1 scan0130 | |
| Customer requests to fit thermometers alongside thermostats and the reliability of different instrument manufacturers. | 12th Sep 1921 | Box 78 \ 1 scan0131 | |
| Investigations into car overheating issues in Switzerland, comparing different engine configurations and modifications. | 8th Oct 1921 | Box 78 \ 1 scan0132 | |
| Development and proposed adoption of thermostat-operated louvres over hand-operated ones for the 40/50 HP chassis. | 1st Dec 1921 | Box 78 \ 1 scan0133 | |
| Customer's letter about a thermostat bellows, discussing its performance, fuel consumption, and suggesting modifications. | 15th Apr 1923 | Box 78 \ 1 scan0134 | |
| Report detailing vehicle cooling system performance, fuel consumption, and temperature readings during extensive road tests. | 11th Aug 1931 | Box 78 \ 1 scan0135 | |
| Letter with a diagram explaining a shutter control mechanism. | 17th Apr 1929 | Box 78 \ 1 scan0136 | |
| Letter discussing a sheet of curves, the workmanship of a jet control mechanism, and an optimum touring speed. | 17th Apr 1929 | Box 78 \ 1 scan0137 | |
| Hand-drawn graph showing petrol consumption at varying speeds with different mixture settings. | 1st Nov 1926 | Box 78 \ 1 scan0138 | |
| Request for particulars of expenses incurred regarding the Wilmot Manufacturing Co. Thermostat Indicator. | 1st Nov 1926 | Box 78 \ 1 scan0139 | |
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