| Description | Date | Identifier | |
| Accompanying drawing No. LeC.1092 for the radiator shutters control mechanism. | 23th May 1919 | Box 39 \ 4 Scan015 | |
| Fitting of capillary tube thermometers and radiator shutters on the 40/50 HP chassis, noting objections to external shutters. | 28th May 1919 | Box 39 \ 4 Scan016 | |
| The suitability of different radiator shutter designs, comparing roll-top and hand-operated options. | 28th May 1919 | Box 39 \ 4 Scan017 | |
| The standardization of the radiator shutter control, referencing drawing No. LeC.1093. | 29th May 1919 | Box 39 \ 4 Scan018 | |
| Distributing a note from Mr. Olley regarding radiator shutters and water temperature control. | 29th May 1919 | Box 39 \ 4 Scan019 | |
| Different designs for automatically controlled radiator louvres. | 13th May 1919 | Box 39 \ 4 Scan020 | |
| Methods for thermostat-controlled radiator shutters (louvres) and the installation of thermometers. | 29th May 1919 | Box 39 \ 4 Scan021 | |
| Covering note forwarding a communication from Mr. Olley regarding radiator shutters and water temperature control. | 29th May 1919 | Box 39 \ 4 Scan022 | |
| Different mechanisms for operating external car radiator louvres. | 13th May 1919 | Box 39 \ 4 Scan023 | |
| Various methods for operating radiator shutters and the benefits of fitting a thermometer. | 29th May 1919 | Box 39 \ 4 Scan024 | |
| Design of radiator shutters for a 40/50 HP chassis, noting potential issues with a design from West Wittering and the need for a less noticeable alternative. | 30th May 1919 | Box 39 \ 4 Scan025 | |
| Technical memorandum discussing the necessity and methods for controlling radiator temperature, such as fitting louvres or shutters. | 2nd Jun 1919 | Box 39 \ 4 Scan026 | |
| Control of radiator water temperatures and the use of thermometers. | 2nd Jun 1919 | Box 39 \ 4 Scan027 | |
| Radiator design and engine temperature control for the 20 HP chassis. | 24th Jun 1919 | Box 39 \ 4 Scan028 | |
| Methods for controlling engine water temperature, specifically addressing issues when driving in London traffic. | 22th Jul 1919 | Box 39 \ 4 Scan029 | |
| Methods for controlling engine water temperature, comparing a bye-pass system to louvres, and the fitting of primers. | 25th Jul 1919 | Box 39 \ 4 Scan030 | |
| Letter requesting to continue building cars without thermostats due to problems with antifreeze evaporation. | 28th Jan 1921 | Box 39 \ 4 Scan031 | |
| Operational issues with bypass thermostats and radiator shutters in cold weather conditions. | 28th Jan 1921 | Box 39 \ 4 Scan032 | |
| Thermostat-controlled radiator shutters, comparing existing systems and considering a new proprietary design. | 28th Jan 1921 | Box 39 \ 4 Scan033 | |
| Standardization and thermostat control of radiator shutters for cars. | 9th Feb 1921 | Box 39 \ 4 Scan034 | |
| The use of thermostats, radiator shutters, and anti-freeze in cars in the U.S.A. during winter conditions. | 19th Dec 1921 | Box 39 \ 4 Scan035 | |
| Continued note on radiator shutter controls and water temperature, referencing American car designs. | 14th Feb 1921 | Box 39 \ 4 Scan036 | |
| Design and issues of thermostats, including the risk of radiator freezing and the poor quality of gasoline. | 15th Feb 1921 | Box 39 \ 4 Scan037 | |
| The design and placement of thermostat-operated radiator louvres and shutters. | 15th Feb 1921 | Box 39 \ 4 Scan038 | |
| Use of a thermometer and standardising thermostat-operated shutters for cars. | 15th Feb 1921 | Box 39 \ 4 Scan039 | |
| The use of thermostats and hand-operated radiator shutters on a chassis. | 2nd Feb 1921 | Box 39 \ 4 Scan040 | |
| Letter discussing thermostat-operated shutters, comparing different designs on American cars. | 3rd Mar 1921 | Box 39 \ 4 Scan041 | |
| Technical comparison of various thermostat and radiator shutter systems for engine temperature regulation. | 3rd Mar 1921 | Box 39 \ 4 Scan042 | |
| Radiator freezing issues in cold weather and the proposed development of an automatic shutter system. | 3rd Mar 1921 | Box 39 \ 4 Scan043 | |
| Cover letter forwarding a query about radiator shutters from The Allen Auto Speciality Co. | 12th Apr 1921 | Box 39 \ 4 Scan044 | |
| The sourcing of radiator shutters from The Allen Auto Speciality Co. of New York. | 15th Apr 1921 | Box 39 \ 4 Scan045 | |
| The merits of hand-controlled louvres versus a thermostat system, particularly regarding the use of alcohol in the cooling system. | 12th Jul 1921 | Box 39 \ 4 Scan046 | |
| Engine overheating, comparing the effectiveness of louvered bonnets versus shutters. | 18th Oct 1921 | Box 39 \ 4 Scan047 | |
| Design evolution of radiator louvres for the 40/50 HP chassis, recommending a thermostat-operated system. | 1st Dec 1921 | Box 39 \ 4 Scan048 | |
| Inquiring about the placement of radiator louvres, whether internal or external. | 12th Dec 1921 | Box 39 \ 4 Scan049 | |
| Design and placement of radiator louvres, concluding the front is the proper place. | 12th Dec 1921 | Box 39 \ 4 Scan050 | |
| Letter arguing against placing shutters on the front of radiators due to their negative impact on the car's appearance and sales. | 5th Dec 1921 | Box 39 \ 4 Scan051 | |
| Necessity of radiator shutters for the Goshawk 11 model to control water temperature in cold climates like the U.S.A. | 1st Jan 1922 | Box 39 \ 4 Scan052 | |
| Continued policy discussion regarding fitting shutters to cars exported to cold climates and for cars used in England. | 1st Jan 1922 | Box 39 \ 4 Scan053 | |
| Letter to Mr. Hives discussing a radiator shutter, a friendly race against a Bentley and a Vauxhall, and shock absorbers. | 24th Jan 1922 | Box 39 \ 4 Scan054 | |
| Opinion on the unsightly arrangement of shutters and the difficulty of manufacturing them without rattles. | 8th Feb 1922 | Box 39 \ 4 Scan055 | |
| Effectiveness and design of louvres for the Goshawk and 40/50 models. | 10th Jan 1923 | Box 39 \ 4 Scan056 | |
| Availability and types of thermostat-controlled radiator shutters. | 12th Jan 1923 | Box 39 \ 4 Scan057 | |
| Promotional leaflet for the 'Winterfront' radiator shutter system. | 28th Dec 1922 | Box 39 \ 4 Scan058 | |
| Technical leaflet for the 'Winterfront' automatic radiator shutter system. | 19th Jan 1923 | Box 39 \ 4 Scan059 | |
| Solutions for engine overheating issues on 40/50 and Goshawk models. | 19th Jan 1923 | Box 39 \ 4 Scan060 | |
| Suggestion to use zinc blocks or sheets to neutralize water and reduce its detrimental effects. | 2nd Feb 1923 | Box 39 \ 4 Scan061 | |
| Business case for supplying and fitting radiator shutters for 40/50 cars. | 2nd Feb 1923 | Box 39 \ 4 Scan062 | |
| Supply of radiator shutters to address customer complaints of engine boiling. | 7th Feb 1923 | Box 39 \ 4 Scan063 | |
| Solutions for engine overheating on 40/50 HP chassis, such as larger radiators and radiator shutters. | 29th Aug 1923 | Box 39 \ 4 Scan064 | |
| Cold weather performance issues with a chassis and proposed radiator and thermostat modifications. | 21th Nov 1923 | Box 39 \ 4 Scan065 | |
| Scheme for radiator shutters for the 40/50 model, similar to those on the 20HP, to prevent engine overcooling. | 28th Nov 1923 | Box 39 \ 4 Scan066 | |
| Water boiling issues in 40/50 HP and 20 HP cars, comparing radiators and recommending shutters. | 4th Feb 1924 | Box 39 \ 4 Scan067 | |
| Internal query regarding the testing and approval of Paddon's Radiator Shutters. | 18th Mar 1924 | Box 39 \ 4 Scan068 | |
| Fitting and quality issues of Paddons Radiator Shutters. | 1st Mar 1924 | Box 39 \ 4 Scan069 | |
| Thermostat-operated radiator shutters for a 20 HP car. | 14th May 1924 | Box 39 \ 4 Scan070 | |
| Test results showing the operation of engine shutters under various heating and cooling conditions. | 20th Mar 1934 | Box 39 \ 4 Scan071 | |
| Engine temperature tests under stationary, road, and hill climb conditions. | 20th Mar 1934 | Box 39 \ 4 Scan072 | |
| Cooling tests for radiator and bonnet shutters, with production notes on the sylphon tube. | 20th Mar 1924 | Box 39 \ 4 Scan073 | |
| Recommendation to replace the shutter control's push-on ball joint with a pin joint. | 16th Jun 1925 | Box 39 \ 4 Scan074 | |
| Customer complaints about the appearance of radiator shutters on the New Phantom. | 21th Oct 1925 | Box 39 \ 4 Scan075 | |
| The design and operation of radiator shutters, comparing them to competitor products. | 1st Dec 1925 | Box 39 \ 4 Scan076 | |
| Implementation of the Bowden wire control for radiator shutters and issues found during testing. | 1st Dec 1925 | Box 39 \ 4 Scan077 | |
| Not advising customers to fit certain Bowden wire-operated radiator shutters to Silver Ghost cars. | 3rd Dec 1925 | Box 39 \ 4 Scan078 | |
| Effectiveness and control mechanisms of radiator shutters. | 19th Nov 1925 | Box 39 \ 4 Scan079 | |
| Design of a 20 HP radiator with vertical shutters. | 14th Jul 1926 | Box 39 \ 4 Scan080 | |
| Reliability and suitability of automatically controlled radiator shutters. | 24th Sep 1927 | Box 39 \ 4 Scan081 | |
| Standardisation of a radiator with integral shutters to improve appearance, design and reduce weight. | 7th Nov 1927 | Box 39 \ 4 Scan082 | |
| Standardisation form for a new chassis part, detailing fitting information and associated costs. | 9th Apr 1928 | Box 39 \ 4 Scan083 | |
| Explaining the delay in fitting vertical shutters to 20 HP cars due to costs and a request from Sales. | 18th May 1928 | Box 39 \ 4 Scan084 | |
| Responding to a complaint about radiator shutters opening too quickly, with a suggestion for modification. | 2nd Feb 1929 | Box 39 \ 4 Scan085 | |
| Response rejecting a suggestion to place the shutter control on the steering column due to engineering constraints. | 1st Mar 1929 | Box 39 \ 4 Scan086 | |
| Need for automatic water temperature control on the S.S. model for improved performance. | 1st May 1929 | Box 39 \ 4 Scan087 | |
| Description of the thermostat element used in the Chrysler automatic radiator shutter system. | 1st May 1929 | Box 39 \ 4 Scan088 | |
| Blueprint of a Chrysler thermostat element. | 24th Apr 1929 | Box 39 \ 4 Scan089 | |
| Considering the pros and cons of fitting thermostatically controlled radiator shutters as an alternative to hand control. | 27th May 1929 | Box 39 \ 4 Scan090 | |
| Necessity and method of lubricating spring-gaiters on various chassis. | 4th Jun 1929 | Box 39 \ 4 Scan091 | |
| Scheme for thermostatically operating radiator shutters, including a new design for the 20 HP chassis. | 5th Oct 1929 | Box 39 \ 4 Scan092 | |
| Thermostats from the Fulton Sylphon Company not meeting the required stroke for 40/50 HP radiator shutters. | 28th Nov 1929 | Box 39 \ 4 Scan093 | |
| Query regarding noise from the 20 HP model's radiator shutters at 1000 revs. | 30th Nov 1929 | Box 39 \ 4 Scan094 | |
| Cabling America to supply a thermostat due to difficulties in obtaining one that meets requirements. | 9th Dec 1929 | Box 39 \ 4 Scan095 | |
| Testing the force required to operate radiator shutters, identifying issues and proposing design changes. | 24th Dec 1929 | Box 39 \ 4 Scan096 | |
| Cover memo for document Lec. 2773 regarding the revised thermostat operating shutters for the Phantom II. | 31th Dec 1929 | Box 39 \ 4 Scan097 | |
| Proposing a double guide for the Phantom radiator shutter thermostat bellows due to issues with the standard single guide. | 1st Feb 1930 | Box 39 \ 4 Scan098 | |
| Letter to S. Smith and Sons regarding samples of a 'Smiths Calorstat' and a request for a meeting. | 18th Feb 1930 | Box 39 \ 4 Scan099 | |
| Letter from S. Smith & Sons regarding a visit to the Experimental Department. | 20th Feb 1930 | Box 39 \ 4 Scan100 | |
| Test report on a Smith Calorstat, measuring internal volume and sylphon rating under various loads. | 8th Mar 1930 | Box 39 \ 4 Scan101 | |
| Test results and a diagram for a Sylphon bellows component under direct loading. | 9th Mar 1930 | Box 39 \ 4 Scan102 | |
| Graph plotting the deflection versus load for a Smith Calorstat sylphon during direct loading and unloading. | 9th Mar 1930 | Box 39 \ 4 Scan103 | |
| Graph plotting deflection against load for Smith Calorstat tests under direct loading conditions. | 10th Mar 1930 | Box 39 \ 4 Scan104 | |
| Letter from S. Smith & Sons Ltd. confirming the delivery of Radiator Shutter Thermostats. | 20th Mar 1930 | Box 39 \ 4 Scan105 | |
| Letter from S. Smith & Sons (Motor Accessories) Ltd regarding the testing, calibration, and delivery of 5 Calorstats. | 20th Mar 1930 | Box 39 \ 4 Scan106 | |
| Analysis of the Smith's Calorstat for Phantom II radiator shutters, detailing operational effort and spring requirements. | 3rd Apr 1930 | Box 39 \ 4 Scan107 | |
| The force required to open shutters on car 23-EX, noting insufficient effort against friction. | 3rd Apr 1930 | Box 39 \ 4 Scan108 | |
| Graph showing the effort available to operate Phantom II radiator shutters with temperature rise for a Smith's Calorstat. | 3rd Apr 1930 | Box 39 \ 4 Scan109 | |
| Mostly blank document page with a 'Print Room' stamp. | 3rd Apr 1930 | Box 39 \ 4 Scan110 | |
| Letter to S. Smith & Sons, Ltd. enquiring about the composition and modification of Calorstats. | 8th Apr 1930 | Box 39 \ 4 Scan111 | |
| Misleading figures from an American ether-filled sylphon element. | 3rd Apr 1930 | Box 39 \ 4 Scan112 | |
| Thermostat tests on a 'Sylphon' unit, comparing performance with alcohol and ether. | 7th Apr 1930 | Box 39 \ 4 Scan113 | |
| Data table showing load supported in pounds at various temperatures and positions for 'SIDI'. | 7th Apr 1930 | Box 39 \ 4 Scan114 | |
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