| Description | Date | Identifier | |
| Letter chasing up test results for a failed calorstat returned to S. Smith & Sons Ltd. | 15th Feb 1939 | Box 156 \ 2 scan0193 | |
| Letter from S. Smith & Sons acknowledging a query concerning a calorstat. | 18th Feb 1939 | Box 156 \ 2 scan0194 | |
| Letter to Messrs. Henry Wiggin & Co. Ltd. requesting a Data Book and information on Wilco-Wiggin Thermometal. | 21th Feb 1939 | Box 156 \ 2 scan0195 | |
| Internal request to place an official order for a special thermostat with a custom temperature setting. | 22th Feb 1939 | Box 156 \ 2 scan0196 | |
| Request to The British Thermostat Co. for a custom thermostat and a modified thermostatic relief valve for an experimental car. | 22th Feb 1939 | Box 156 \ 2 scan0197 | |
| Letter from S. Smith & Sons regarding the repair and free of charge replacement of a Smithermet from chassis GGR-63. | 22th Feb 1939 | Box 156 \ 2 scan0198 | |
| Requesting the despatch of a special Hexane filled calorstat to S.Smith & Sons Ltd. for modification. | 23th Feb 1939 | Box 156 \ 2 scan0199 | |
| Letter from S. Smith & Sons regarding a defective calorstat returned from a Bentley. | 23th Feb 1939 | Box 156 \ 2 scan0200 | |
| Requesting the despatch of two Wraith calorstats to the Cricklewood Depot. | 24th Feb 1939 | Box 156 \ 2 scan0201 | |
| Letter concerning a delay, the supply of an experimental thermostat, and a forthcoming drawing for a thermostatic relief valve. | 28th Feb 1939 | Box 156 \ 2 scan0202 | |
| Letter from The British Thermostat Co., Ltd. regarding a thermostatic header tank relief valve for Bentley pressure-cooled systems. | 6th Mar 1939 | Box 156 \ 2 scan0203 | |
| Arrangement of a pressure and vacuum valve assembly (P.L.V.). | 21th Sep 1938 | Box 156 \ 2 scan0204 | |
| General arrangement drawing of a pressure loading valve. | 22th Sep 1938 | Box 156 \ 2 scan0205 | |
| Follow-up memo chasing a reply regarding charges for Bentley Chassis B.55.LE. | 7th Mar 1939 | Box 156 \ 2 scan0206 | |
| Query to a supplier regarding the filling substance and operating temperature of Wraith type calorstats. | 8th Mar 1939 | Box 156 \ 2 scan0207 | |
| Letter from S. Smith & Sons regarding the performance specifications of calorstats, including travel, load, and the Hexane fluid used. | 13th Mar 1939 | Box 156 \ 2 scan0208 | |
| Letter from S. Smith & Sons detailing their testing method of submerging units in water for uniformity. | 13th Mar 1939 | Box 156 \ 2 scan0209 | |
| Letter of complaint to a supplier regarding an unauthorized change in the filling of Calorstats to Hexane. | 14th Mar 1939 | Box 156 \ 2 scan0210 | |
| Letter from S. Smith & Sons acknowledging receipt of correspondence and passing it on for investigation. | 15th Mar 1939 | Box 156 \ 2 scan0211 | |
| Letter from S. Smith & Sons about complaints over the incorrect filling of Calorstats and the resulting specification changes. | 15th Mar 1939 | Box 156 \ 2 scan0212 | |
| Letter from S. Smith & Sons detailing the performance specifications of a hexane-filled unit. | 15th Mar 1939 | Box 156 \ 2 scan0213 | |
| Letter from S. Smith & Sons regarding the performance of shutter 'calorstats' and sending a modified unit for testing. | 12th Oct 1939 | Box 156 \ 2 scan0214 | |
| Letter to a supplier regarding incorrectly set calorstats and clarification on temperature specifications. | 6th Oct 1938 | Box 156 \ 2 scan0215 | |
| Letter from S. Smith & Sons to W.A. Robotham regarding the return of Smithermets. | 16th Mar 1939 | Box 156 \ 2 scan0216 | |
| Updated operating temperature specifications for the Wraith Calorstat following a complaint. | 21th Mar 1939 | Box 156 \ 2 scan0217 | |
| Letter from The British Thermostat Co. Ltd. regarding a thermostatically operated relief valve for an experimental Bentley car. | 19th Apr 1939 | Box 156 \ 2 scan0218 | |
| Letter from a supplier correcting a mistake in a drawing for a Thermostatic Relief Valve for an experimental Bentley car. | 20th Apr 1939 | Box 156 \ 2 scan0219 | |
| Letter to The British Thermostat Co. Ltd. questioning their valve design and comparing it to a Rolls-Royce scheme. | 21th Apr 1939 | Box 156 \ 2 scan0220 | |
| Letter from The British Thermostat Co., Ltd. explaining the operation of a valve and referencing drawing No.11295/A. | 25th Apr 1939 | Box 156 \ 2 scan0221 | |
| Page 2 of a letter from The British Thermostat Co., Ltd. explaining the function of their valve design. | 25th Apr 1939 | Box 156 \ 2 scan0222 | |
| Cross-section drawing of a radiator relief valve with annotations. | 21th Apr 1939 | Box 156 \ 2 scan0223 | |
| Letter from The British Thermostat Co. Ltd. regarding a thermostatically operated header tank relief valve. | 26th Apr 1939 | Box 156 \ 2 scan0224 | |
| Letter from The British Thermostat Co. regarding a meeting to discuss a thermostatic header tank relief valve for a pressure-cooled Bentley system. | 29th Apr 1939 | Box 156 \ 2 scan0225 | |
| Letter to S. Smith & Sons Ltd. arranging a visit to check a Thermostat rig. | 1st May 1939 | Box 156 \ 2 scan0226 | |
| Letter from S. Smith & Sons (Motor Accessories) Ltd to Rolls Royce Ltd confirming a meeting. | 2nd May 1939 | Box 156 \ 2 scan0227 | |
| Letter chasing progress on a thermostatic relief valve for pressure cooling. | 15th May 1939 | Box 156 \ 2 scan0228 | |
| Letter from a supplier apologising for a delay in submitting a drawing. | 16th May 1939 | Box 156 \ 2 scan0229 | |
| Letter from The British Thermostat Co., Ltd. regarding the functioning of a Radiator Relief Valve. | 25th May 1939 | Box 156 \ 2 scan0230 | |
| Letter from The British Thermostat Co. Ltd. detailing the operation of a thermostatically operated car header tank relief valve. | 31th May 1939 | Box 156 \ 2 scan0231 | |
| Drawing showing a cross-section of a radiator relief valve with handwritten annotations. | 25th May 1939 | Box 156 \ 2 scan0232 | |
| Letter to the British Thermostat Co. Ltd. discussing a thermostat design and ordering experimental samples. | 2nd Jun 1939 | Box 156 \ 2 scan0233 | |
| Requesting an official order for two radiator relief valves from the British Thermostat Co. | 2nd Jun 1939 | Box 156 \ 2 scan0234 | |
| Letter from The British Thermostat Co., Ltd. regarding the production and quotation for Radiator Relief Valves. | 6th Jun 1939 | Box 156 \ 2 scan0235 | |
| Follow-up letter regarding the status of a Special Hexane Filled Calorstat sent for modification. | 6th Jun 1939 | Box 156 \ 2 scan0236 | |
| Letter from The British Thermostat Co., Ltd. regarding a future visit to Derby. | 15th Jun 1939 | Box 156 \ 2 scan0237 | |
| The discontinuation of tests on a Hexane Filled Calorstat and a privately ordered handbook. | 15th Jun 1939 | Box 156 \ 2 scan0238 | |
| Letter to The British Thermostat Co. Ltd. chasing an outstanding order for two relief valves for testing. | 4th Jul 1939 | Box 156 \ 2 scan0239 | |
| Letter from The British Thermostat Co. Ltd. confirming the dispatch of two relief valves. | 5th Jul 1939 | Box 156 \ 2 scan0240 | |
| Internal request to place an order for a high-temperature thermostat from S.Smith & Sons Ltd. | 10th Jul 1939 | Box 156 \ 2 scan0241 | |
| Letter to S.Smith & Sons Ltd. regarding a failure of a Bentley V thermostat bellows and requesting a design modification. | 10th Jul 1939 | Box 156 \ 2 scan0242 | |
| Letter from the Experimental Department to British Filters Ltd. enclosing prints for thermostats. | 11th Jul 1939 | Box 156 \ 2 scan0243 | |
| Letter from British Filters Ltd acknowledging receipt of drawings. | 13th Jul 1939 | Box 156 \ 2 scan0244 | |
| Letter from supplier S. Smith & Sons responding to a complaint about thermostats supplied for the Bentley Car. | 14th Jul 1939 | Box 156 \ 2 scan0245 | |
| Letter to British Filters Ltd. regarding the return of a bellows-type thermostat for examination. | 17th Jul 1939 | Box 156 \ 2 scan0246 | |
| Letter from British Filters Ltd regarding the return of a thermostat. | 19th Jul 1939 | Box 156 \ 2 scan0247 | |
| Letter to S. Smith & Sons Ltd. concerning a failed Bentley V thermostat sent for inspection. | 20th Jul 1939 | Box 156 \ 2 scan0248 | |
| The return of a B.V. Thermostat to S. Smith & Sons Ltd for inspection. | 20th Jul 1939 | Box 156 \ 2 scan0249 | |
| Letter from S. Smith & Sons discussing a faulty thermostat returned for examination. | 24th Jul 1939 | Box 156 \ 2 scan0250 | |
| Letter from S. Smith & Sons about a returned thermostat, suspecting it was subjected to overheating. | 24th Jul 1939 | Box 156 \ 2 scan0251 | |
| Quotation letter from The British Thermostat Co., Ltd. for a 'little Bentley' combined relief and vent valve. | 26th Jul 1939 | Box 156 \ 2 scan0252 | |
| Letter to Avon India Rubber Co. agreeing to share the cost of sending tyres to France on a fifty-fifty basis. | 3rd Aug 1939 | Box 156 \ 2 scan0253 | |
| Letter to The Avon India Rubber Co. regarding tyre tread separation on a streamline car in France and requesting a meeting. | 3rd Aug 1939 | Box 156 \ 2 scan0254 | |
| Letter to The British Thermostat Co. Ltd. regarding unsatisfactory test results on two valves and arranging a meeting. | 8th Aug 1939 | Box 156 \ 2 scan0255 | |
| Letter from the Experimental Department to S. Smith & Sons Ltd. arranging a meeting. | 8th Aug 1939 | Box 156 \ 2 scan0256 | |
| Dispatch of a second-hand tyre to Avon India Rubber Co. Ltd. | 9th Aug 1939 | Box 156 \ 2 scan0257 | |
| Letter to Avon India Rubber Co. Ltd. regarding the dispatch of a second-hand tyre cover. | 9th Aug 1939 | Box 156 \ 2 scan0258 | |
| Letter to The Avon India Rubber Co. about tyre specifications and testing for the 'Corniche' model. | 10th Aug 1939 | Box 156 \ 2 scan0259 | |
| Letter from The British Thermostat Co. regarding an alternative scheme for Bentley Combined Relief and Vent Valves. | 10th Aug 1939 | Box 156 \ 2 scan0260 | |
| Letter from S. Smith & Sons acknowledging a previous letter and confirming an appointment. | 11th Aug 1939 | Box 156 \ 2 scan0261 | |
| Authorising payment for Avon tyres and tubes forwarded to Mr. Waller in Chateauroux. | 11th Aug 1939 | Box 156 \ 2 scan0262 | |
| Short memo regarding a thermostat, a location, and an expected arrival time. | 15th Aug 1939 | Box 156 \ 2 scan0263 | |
| Telegram received by telephone to arrange a convenient time for a meeting with Edwards on Wednesday. | 15th Aug 1939 | Box 156 \ 2 scan0264 | |
| Telegram from Sunbury on Thames to Derby requesting a convenient time to meet about a thermostat. | 15th Aug 1939 | Box 156 \ 2 scan0265 | |
| Memo containing two separate messages regarding scheduling changes. | 15th Aug 1939 | Box 156 \ 2 scan0266 | |
| Letter to S. Smith & Sons Ltd. about a meeting and the specifications for a pressure cooling system valve. | 15th Aug 1939 | Box 156 \ 2 scan0267 | |
| Letter from The British Thermostat Co., Ltd. confirming a rescheduled meeting based on a telegram received. | 15th Aug 1939 | Box 156 \ 2 scan0268 | |
| Letter from S. Smith & Sons regarding an appointment with Mr. Edwards. | 15th Aug 1939 | Box 156 \ 2 scan0269 | |
| Letter from S. Smith & Sons to Mr. A. F. Martindale of the Experimental Department regarding a scheme and requesting a diagram. | 17th Aug 1939 | Box 156 \ 2 scan0270 | |
| Letter to S. Smith & Sons Ltd. outlining a scheme for a new thermostat design. | 19th Aug 1939 | Box 156 \ 2 scan0271 | |
| Letter from supplier S. Smith & Sons regarding a new design and production timeline. | 23th Aug 1939 | Box 156 \ 2 scan0272 | |
| Correspondence to S.Smith & Sons Ltd. regarding the making up of sample valves. | 25th Aug 1939 | Box 156 \ 2 scan0273 | |
| Letter from The British Thermostat Co. Ltd. detailing the costs involved for two Bentley Relief valves and asking whether to proceed with modifications. | 19th Sep 1939 | Box 156 \ 2 scan0274 | |
| Letter to The British Thermostat Co. Ltd. regarding the cost of two experimentally made Bentley Relief Valves. | 26th Sep 1939 | Box 156 \ 2 scan0275 | |
| Letter from The British Thermostat Co. Ltd. regarding the cost of an experimental instrument. | 29th Sep 1939 | Box 156 \ 2 scan0276 | |
| Letter to Mr. Martin-Hurst regarding payment towards the cost of two Bentley Relief Valves. | 3rd Oct 1939 | Box 156 \ 2 scan0277 | |
| Retrofitting an engine thermostat to a 1937 Bentley, chassis number 96KT. | 31th Jan 1940 | Box 156 \ 2 scan0278 | |
| Letter discussing the feasibility of fitting an engine thermostat to a Bentley car, chassis number 96.K.T. | 14th Feb 1940 | Box 156 \ 2 scan0279 | |
| Page two of a letter stating that job completion cannot be guaranteed within the previously mentioned timeframe. | 14th Feb 1940 | Box 156 \ 2 scan0280 | |
| Letter from The British Thermostat Co. Ltd. regarding the fitting of a thermostat to a Bentley car. | 19th Feb 1940 | Box 156 \ 2 scan0281 | |
| Letter to The British Thermostat Co. Ltd. concerning the fitting of a thermostat to a Bentley. | 29th Feb 1940 | Box 156 \ 2 scan0282 | |
| Letter to The British Thermostat Co. Ltd. concerning the fitting of a thermostat, water pump and potential parts interchangeability issues. | 12th Mar 1940 | Box 156 \ 2 scan0283 | |
| The concluding page of a letter regarding a modification to be carried out by Mr. Bellringer. | 12th Mar 1940 | Box 156 \ 2 scan0284 | |
| Letter from The British Thermostat Co., Ltd. to John L. Edwards regarding a matter now left with Mr. Bellringer. | 15th Mar 1940 | Box 156 \ 2 scan0285 | |
| Letter from S. Smith & Sons discussing a thermostatic relief valve and a potential joint patent. | 19th Mar 1940 | Box 156 \ 2 scan0286 | |
| Letter to The British Thermostat Co. Ltd. about producing a cheaper and efficient thermostat for a Bentley. | 2nd Apr 1940 | Box 156 \ 2 scan0287 | |
| Letter from The British Thermostat Co. Ltd. requesting an up-to-date drawing for the Bentley Thermostat. | 3rd Apr 1940 | Box 156 \ 2 scan0288 | |
| Letter to The British Thermostat Co. Ltd. regarding a print of a thermostat. | 10th Apr 1940 | Box 156 \ 2 scan0289 | |
| Requesting a specific type of thermostat for the Clan Foundry Rigs and referencing issues with the current one. | 1st Oct 1940 | Box 156 \ 2 scan0290 | |
| Letter from The British Thermostat Co. Ltd. regarding the fitting of a thermostat to a car. | 19th Aug 1940 | Box 156 \ 2 scan0291 | |
| Letter regarding a trial of tyres from The Avon India Rubber Company. | 17th Jun 1921 | Box 156 \ 3 scan0001 | |
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