| Description | Date | Identifier | |
| Blank document page marked with a purple ink Print Room date stamp. | 17th Dec 1939 | Box 39 \ 4 Scan215 | |
| Disadvantages of running cars at a low temperature of 60° with thermostatically operated shutters. | 5th Jan 1931 | Box 39 \ 4 Scan216 | |
| Technical memo on thermostatically controlled shutters for the Phantom II in the U.S.A., discussing optimal water temperatures and modifications. | 7th Jan 1931 | Box 39 \ 4 Scan217 | |
| The design and benefits of thermostatically controlled radiator shutters and engine cooling improvements. | 11th Jan 1931 | Box 39 \ 4 Scan218 | |
| Modifications to the Phantom 2's thermo-operated shutters and radiator tank. | 1st Jan 1930 | Box 39 \ 4 Scan219 | |
| Thermostatically Controlled Radiator Shutters. | 15th Jan 1931 | Box 39 \ 4 Scan220 | |
| Satisfactory results of testing Calorstat fillings. | 15th Jan 1931 | Box 39 \ 4 Scan221 | |
| Test results for six 'Smith Calorstat' units with 'H' filling, measuring pull and push load at various temperatures. | 12th Jan 1931 | Box 39 \ 4 Scan222 | |
| Graph plotting temperature in degrees Celsius against pull and push force in pounds for Smith Calorstats with 'H' filling. | 12th Jan 1931 | Box 39 \ 4 Scan223 | |
| Letter to S. Smith & Sons, Ltd. requesting a special filling for a car thermostat with specific operating temperatures. | 19th Jan 1934 | Box 39 \ 4 Scan224 | |
| The despatch of a modified car Calorstat to Messrs. Smith & Sons, Ltd. | 19th Jan 1931 | Box 39 \ 4 Scan225 | |
| Requesting that car thermostats be marked with a letter corresponding to their filling, to differentiate between those for American and European conditions. | 19th Jan 1931 | Box 39 \ 4 Scan226 | |
| Notice regarding the approval of 'H' filling for calorstats for radiator shutter controls. | 19th Jan 1931 | Box 39 \ 4 Scan227 | |
| Letter from S. Smith & Sons discussing an instrument's operation and pressure readings for a shutter. | 20th Jan 1931 | Box 39 \ 4 Scan228 | |
| Letter from S. Smith & Sons (Motor Accessories) Ltd. regarding the supply of the R.V.70 type for aircraft radiator shutters. | 20th Jan 1931 | Box 39 \ 4 Scan229 | |
| The despatch of two Calorstats to Messrs. Smith & Sons Ltd. with specific filling instructions. | 21th Jan 1931 | Box 39 \ 4 Scan230 | |
| Letter from S. Smith & Sons (Accessories) Ltd. discussing the performance of two 'Smithermets' (shutter thermostats). | 5th Feb 1931 | Box 39 \ 4 Scan231 | |
| Letter from S. Smith & Sons clarifying the operating specifications for a Smithermet stem. | 11th Feb 1931 | Box 39 \ 4 Scan232 | |
| Test results for a 'J' Filling Thermostat, detailing its opening and closing temperatures. | 11th Feb 1931 | Box 39 \ 4 Scan233 | |
| Standardisation of chassis parts, specifically automatically operated radiator shutters with Smiths 'Calorstat'. | 25th Aug 1930 | Box 39 \ 4 Scan234 | |
| Proposal form for standardising an automatic brake shoe adjuster, detailing costs and implementation. | 20th Nov 1935 | Box 39 \ 4 Scan235 | |
| Letter from S. Smith & Sons regarding a sample Shutter Operating Smithermet instrument with modified bellows. | 28th Feb 1931 | Box 39 \ 4 Scan236 | |
| Graph showing the performance of a Smithermet 'J' filling for shutter control, plotting temperature against push and pull forces. | 20th Mar 1931 | Box 39 \ 4 Scan237 | |
| Test data for Smithermet 'J' Filling, detailing shutter pull and push forces at various temperatures. | 20th Mar 1931 | Box 39 \ 4 Scan238 | |
| Letter to supplier S. Smith & Sons regarding testing and specifications for a Smethermet bellows component and the return of a Calorstat. | 11th Apr 1931 | Box 39 \ 4 Scan239 | |
| Graph and data table showing the load vs deflection rating of bellows after being punctured. | 20th Apr 1931 | Box 39 \ 4 Scan240 | |
| Testing on thermostatically operated shutters using a bellows without a spring. | 11th Apr 1931 | Box 39 \ 4 Scan241 | |
| Graph and data table showing the rating of bellows after puncturing for a Smitherment 'J' filling. | 14th Apr 1931 | Box 39 \ 4 Scan242 | |
| Despatch of one Calorstat to Messrs. S. Smith & Sons, Ltd. in Birmingham. | 14th Apr 1931 | Box 39 \ 4 Scan243 | |
| Letter from S. Smith & Sons regarding the pre-compression of bellows on a shutter thermostat. | 16th Apr 1931 | Box 39 \ 4 Scan244 | |
| Enquiry for Smitherit bellows for a petrol pump and associated costs. | 22th Apr 1931 | Box 39 \ 4 Scan245 | |
| Letter to S. Smith & Sons Ltd. inquiring about manufacturing thermostat bellows from a thinner material for special purposes. | 22th Apr 1931 | Box 39 \ 4 Scan246 | |
| Letter from S. Smith & Sons regarding the impracticality of using thinner metal for bellows manufacture. | 23th Apr 1931 | Box 39 \ 4 Scan247 | |
| Grit from tarred roads jamming radiator shutters, causing overheating, and a suggestion to devise a protective guard. | 1st Sep 1931 | Box 39 \ 4 Scan248 | |
| Modifications to radiator shutters to prevent the collection of grit and stones. | 5th Sep 1931 | Box 39 \ 4 Scan249 | |
| Standardisation of chassis parts by dropping the radiator and incorporating thermostatic shutters. | 20th Oct 1931 | Box 39 \ 4 Scan250 | |
| Implementation and cost-saving of a standardized chassis part. | 10th Nov 1923 | Box 39 \ 4 Scan251 | |
| Three design schemes for radiator shutters. | 23th Jan 1932 | Box 39 \ 4 Scan252 | |
| Query sent to S.Smith & Sons Ltd. about capsules and a related drawing. | 3rd Feb 1932 | Box 39 \ 4 Scan253 | |
| Letter from S.Smith & Sons regarding the design of a thermostatic oil valve, comparing capsules to flexible bellows. | 2nd Feb 1932 | Box 39 \ 4 Scan254 | |
| Letter concerning oil pressure requirements for a thermostat and oil valve equipment. | 7th Apr 1932 | Box 39 \ 4 Scan255 | |
| Request for the manufacture of two types of thermostat springs with detailed specifications. | 7th Apr 1932 | Box 39 \ 4 Scan256 | |
| Letter to S. Smith & Sons Ltd. concerning a faulty radiator thermometer and its subsequent replacement. | 1st May 1932 | Box 39 \ 4 Scan257 | |
| Suggestion from Mr. Phil Paddon regarding thermostatically controlled radiator shutters. | 2nd May 1932 | Box 39 \ 4 Scan258 | |
| Letter from Phil Paddon of Paddon Brothers Ltd. suggesting an improvement for radiator shutter operation. | 2nd May 1932 | Box 39 \ 4 Scan259 | |
| Page 2 of a letter to A. F. Sidgreaves regarding a piston-operated windscreen wiper. | 2nd May 1932 | Box 39 \ 4 Scan260 | |
| Mr. Paddon's suggestion for a new, cheaper, and simpler radiator shutter mechanism. | 11th May 1932 | Box 39 \ 4 Scan261 | |
| Mechanics, forces, and costs involved in operating radiator shutters. | 12th May 1932 | Box 39 \ 4 Scan262 | |
| Summary comparing an existing thermostat scheme with a less practical suggested proposal. | 12th May 1932 | Box 39 \ 4 Scan263 | |
| Practicality of various radiator shutter schemes. | 12th May 1932 | Box 39 \ 4 Scan264 | |
| Requesting the manufacture of 12 thermostat springs to specification Hs.5804, replacing EX.7836. | 13th May 1932 | Box 39 \ 4 Scan265 | |
| Specifications for two types of thermostat springs, A and B. | 14th Apr 1932 | Box 39 \ 4 Scan266 | |
| New thermostat springs to address complaints of low water temperatures. | 23th May 1932 | Box 39 \ 4 Scan267 | |
| The provision of a spring to control thermostat opening temperature. | 26th May 1932 | Box 39 \ 4 Scan268 | |
| Letter to a supplier regarding capsules for an oil cut-off operating at an incorrect temperature. | 10th Aug 1932 | Box 39 \ 4 Scan269 | |
| Letter from S. Smith & Sons about modifying an Oil Relief Valve Thermostat to operate at a lower temperature. | 12th Aug 1932 | Box 39 \ 4 Scan270 | |
| Despatch of an oil relief thermostat to Messrs Smiths & Sons to be filled with fluid. | 8th Aug 1932 | Box 39 \ 4 Scan271 | |
| Letter to S. Smith & Sons confirming the dispatch of an Oil Relief Thermostat, part number E.58119. | 13th Aug 1932 | Box 39 \ 4 Scan272 | |
| Forwarding thermostat E.58119 to Messrs. S. Smith & Sons for filling with fluid. | 7th Sep 1932 | Box 39 \ 4 Scan273 | |
| Letter from S. Smith & Sons regarding design issues and suggested modifications for an oil valve thermostat's bellows. | 5th Sep 1932 | Box 39 \ 4 Scan274 | |
| Letter to S. Smith & Sons Ltd. regarding the urgent supply of 26mm bellows for a relief valve experiment. | 8th Sep 1932 | Box 39 \ 4 Scan275 | |
| Letter from S. Smith & Sons regarding the specifications and recommended design changes for an oil valve thermostat. | 8th Sep 1932 | Box 39 \ 4 Scan276 | |
| Letter from S. Smith & Sons discussing an experimental Oil Valve Thermostat with larger bellows. | 9th Sep 1932 | Box 39 \ 4 Scan277 | |
| Proposal from S. Smith & Sons regarding thermostat regulation and cut-off temperatures. | 10th Sep 1932 | Box 39 \ 4 Scan278 | |
| Letter to S. Smith & Sons Ltd arranging for Mr. Grylls to handle a meeting due to the original contact's absence. | 10th Sep 1932 | Box 39 \ 4 Scan279 | |
| Confirming an order for an oil valve thermostat from S. Smith & Sons. | 14th Sep 1932 | Box 39 \ 4 Scan280 | |
| Request for a spring and fitting instructions for thermostatically controlled radiator shutters. | 21th Sep 1932 | Box 39 \ 4 Scan281 | |
| Conversion of hand-operated radiator shutters to thermostatic operation for car 58-GN. | 22th Sep 1932 | Box 39 \ 4 Scan282 | |
| Difference between thermostatically operated and hand-controlled radiator shutters, with a request for parts to trial. | 23th Sep 1932 | Box 39 \ 4 Scan283 | |
| Fitting of two thermostat springs for thermostatically operated radiator shutters. | 24th Sep 1932 | Box 39 \ 4 Scan284 | |
| Return of a faulty calorstat to Messrs. Smiths in Birmingham for correction. | 30th Sep 1932 | Box 39 \ 4 Scan285 | |
| Tests conducted on a thermostat for controlling extra cylinder lubrication. | 10th Oct 1932 | Box 39 \ 4 Scan286 | |
| On the test results of a thermostat bellows for extra cylinder lubrication. | 14th Oct 1932 | Box 39 \ 4 Scan287 | |
| Graph showing the rating of bellows for a J III cylinder oil thermostat, plotting extension against load. | 12th Oct 1932 | Box 39 \ 4 Scan288 | |
| Cover sheet stamped by the Print Room in Derby. | 14th Oct 1932 | Box 39 \ 4 Scan289 | |
| Letter from S. Smith & Sons regarding an Automatic Jet Control for an S.U. Carburetter. | 4th Nov 1932 | Box 39 \ 4 Scan290 | |
| Blueprint for an automatic choke control of the Carter type. | 2nd Nov 1937 | Box 39 \ 4 Scan291 | |
| Letter from S. Smith & Sons regarding the despatch and fitting of a Water Type Automatic Jet Control unit. | 7th Nov 1932 | Box 39 \ 4 Scan292 | |
| To stores regarding the return of a Calorstat unit for modification. | 12th Nov 1932 | Box 39 \ 4 Scan293 | |
| Letter to S. Smith & Sons Co. Ltd. concerning the failure and required modification of a colorstat spindle. | 12th Nov 1932 | Box 39 \ 4 Scan294 | |
| Despatch note confirming a Calorstat is being sent to Messrs. Smith & Sons Ltd. for modification. | 15th Nov 1932 | Box 39 \ 4 Scan295 | |
| Letter to Messrs. Smith & Sons Ltd. regarding the dispatch of a calorstat for a modified spindle. | 15th Nov 1932 | Box 39 \ 4 Scan296 | |
| The suitability of using thermostat springs from Phantom II trials cars in the 25 HP car. | 17th Nov 1932 | Box 39 \ 4 Scan297 | |
| Standardisation and testing of thermostat springs. | 19th Nov 1932 | Box 39 \ 4 Scan298 | |
| The standardization of thermostat springs for the Phantom II model. | 21th Nov 1932 | Box 39 \ 4 Scan299 | |
| Test of bi-metal plates for controlling extra oil to the cylinders on the Peregrine engine. | 13th Dec 1932 | Box 39 \ 4 Scan300 | |
| Graph comparing the deflection versus temperature for a Bi-Metal Thermostat and another thermostat type. | 10th Dec 1932 | Box 39 \ 4 Scan301 | |
| Cover note for a letter to Attercliffe, processed by the Print Room. | 14th Dec 1932 | Box 39 \ 4 Scan302 | |
| Follow-up letter from S. Smith & Sons regarding their patent Automatic Jet Controls sent for testing. | 2nd Jan 1933 | Box 39 \ 4 Scan303 | |
| Letter to S. Smith & Sons regarding an automatic jet control sent to Mr. Skinner of the S.U. Company. | 3rd Jan 1933 | Box 39 \ 4 Scan304 | |
| Letter from S. Smith & Sons acknowledging that a car with automatic jet control has been sent to the S.U. Company. | 4th Jan 1933 | Box 39 \ 4 Scan305 | |
| Questioning an invoice from S. Smith & Sons for parts supplied for Mr. Evendens car. | 16th Jan 1933 | Box 39 \ 4 Scan306 | |
| Confirming receipt of parts for Bensport, ordered by Mr. Evernden, to be charged to a specific car. | 17th Jan 1933 | Box 39 \ 4 Scan307 | |
| Letter from Gallay Radiator Co. Ltd. in voluntary liquidation regarding a 'Hercule' Thermostat. | 22th Apr 1933 | Box 39 \ 4 Scan308 | |
| Confirming that two sample thermostats from the Gallay Radiator Company have been traced to the Experimental Department. | 24th Apr 1933 | Box 39 \ 4 Scan309 | |
| Letter from Gallay Radiator Co. Ltd. enclosing a catalogue for the 'Hercule' Thermostat. | 28th Mar 1933 | Box 39 \ 4 Scan310 | |
| Request for information on the 'Hercule' thermostat from S. Smith & Sons, Ltd. | 1st May 1933 | Box 39 \ 4 Scan311 | |
| Letter from S. Smith & Sons regarding an enquiry for a 'Hercule' Thermostat. | 3rd May 1933 | Box 39 \ 4 Scan312 | |
| Communication regarding an enquiry about the Gallay 'Hercule' Thermostat. | 8th May 1933 | Box 39 \ 4 Scan313 | |
| Test results for a Gallay 'Hercule' thermostat, detailing loads required at various temperatures and plunger positions. | 5th May 1933 | Box 39 \ 4 Scan314 | |
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