| Description | Date | Identifier | |
| Letter from H.M. Hobson acknowledging receipt of a letter regarding a loaned Heat Indicator. | 28th Jul 1936 | Box 175 \ 4 img208 | |
| Letter from H.M. Hobson, Ltd. arranging a meeting with Mr C.S. Steadman. | 29th Jul 1936 | Box 175 \ 4 img209 | |
| Letter arranging a meeting to discuss the Hobson Temperature Indicator. | 30th Jul 1936 | Box 175 \ 4 img210 | |
| Sample distance reading thermometer and a critique of its capillary tube armoring. | 4th Aug 1936 | Box 175 \ 4 img211 | |
| Letter to H.M. Hobson Components regarding the supply of a dual instrument for a vehicle dashboard. | 4th Aug 1936 | Box 175 \ 4 img212 | |
| Letter detailing required modifications for a loaned thermometer, including accuracy correction and fitting adjustments. | 6th Aug 1936 | Box 175 \ 4 img213 | |
| Transmitting thermometer on loan from Messrs. Smith & Sons, which is to be returned for modification. | 6th Aug 1936 | Box 175 \ 4 img214 | |
| Letter from H.M. Hobson Components regarding a proposed dual instrument gauge and a tested Heat Indicator. | 7th Aug 1936 | Box 175 \ 4 img215 | |
| Letter from a supplier discussing the accuracy and physical design of an instrument. | 7th Aug 1936 | Box 175 \ 4 img216 | |
| Letter to S. Smith & Sons regarding a sample water temperature thermometer with a special small diameter capillary tube for noise elimination testing. | 6th Aug 1936 | Box 175 \ 4 img217 | |
| Letter concerning the modification of a thermometer and inquiring about the cost of a capillary connection. | 7th Aug 1936 | Box 175 \ 4 img218 | |
| Letter from S. Smith & Sons regarding a radiator thermometer, a missing union nut, and the cost of a special capillary. | 7th Aug 1936 | Box 175 \ 4 img219 | |
| Letter to H.M. Hobson & Co. Ltd. responding to their sketch no. 456 for a telegage and discussing instrument accuracy. | 8th Aug 1936 | Box 175 \ 4 img220 | |
| Letter clarifying the requirements for adapting a bulb to fit a cylinder head. | 11th Aug 1936 | Box 175 \ 4 img221 | |
| Correspondence regarding the fitment, accuracy, and modification of a dual electric gauge. | 11th Aug 1936 | Box 175 \ 4 img222 | |
| Letter from H.M. Hobson Components Ltd. regarding a discrepancy in thread count for a bulb component. | 11th Aug 1936 | Box 175 \ 4 img223 | |
| Invoice from S. Smith & Sons (MA) Ltd. for a special thermometer and a query about its payment. | 12th Aug 1936 | Box 175 \ 4 img224 | |
| Letter from H.M. Hobson Components Ltd. regarding a modified Electric Gauge sample. | 12th Aug 1936 | Box 175 \ 4 img225 | |
| Thermometer received for testing, which was returned to the supplier for modification. | 13th Aug 1936 | Box 175 \ 4 img226 | |
| Request to order one dozen glass thermometers, reading from 0 to 100°C, for experimental use. | 9th Oct 1936 | Box 175 \ 4 img227 | |
| Letter to S. Smith & Son Ltd. regarding the testing and potential production of an experimental thermometer with flexible capillary tubing. | 16th Oct 1936 | Box 175 \ 4 img228 | |
| Letter from S. Smith & Sons regarding an experimental thermometer. | 20th Oct 1936 | Box 175 \ 4 img229 | |
| Letter from S. Smith & Sons regarding the extra cost of special tubing for a thermometer. | 9th Nov 1936 | Box 175 \ 4 img230 | |
| Official order for parts from Messrs Smith & Sons Ltd. | 11th Nov 1936 | Box 175 \ 4 img231 | |
| Letter to S. Smith & Sons requesting the supply of a combined thermometer/oil pressure gauge and a Bentley thermometer. | 11th Nov 1936 | Box 175 \ 4 img232 | |
| Letter from S. Smith & Sons acknowledging an order for a combined Thermometer and Oil Pressure gauge. | 12th Nov 1936 | Box 175 \ 4 img233 | |
| Letter to Messrs Smith & Sons regarding the cost of thermometer mountings and flexible capillaries, requesting an order be put on hold. | 12th Nov 1936 | Box 175 \ 4 img234 | |
| Letter from S. Smith & Sons regarding the cost of a new type of flexible capillary. | 13th Nov 1936 | Box 175 \ 4 img235 | |
| Requesting a covering order to clear an old invoice for a thermometer supplied by S. Smith & Sons. | 14th Nov 1936 | Box 175 \ 4 img236 | |
| Request to place an order with Messrs S. Smith and Sons for a Bentley water temperature thermometer with custom tubing. | 16th Nov 1936 | Box 175 \ 4 img237 | |
| Necessity of a supporting clip for the thermometer capillary tube on the 25/30 HP model. | 18th Nov 1936 | Box 175 \ 4 img238 | |
| Letter from S. Smith & Sons justifying the extra cost for a special thermometer flexible capillary. | 18th Nov 1936 | Box 175 \ 4 img239 | |
| Letter from S. Smith & Sons following up on a previously suspended order for two instruments. | 25th Nov 1936 | Box 175 \ 4 img240 | |
| Cancelling an order for two thermometers. | 26th Nov 1936 | Box 175 \ 4 img241 | |
| Letter to S. Smith & Sons cancelling an order for two instruments pending further testing. | 26th Nov 1936 | Box 175 \ 4 img242 | |
| Letter from S. Smith & Sons confirming the cancellation of an order for two instruments. | 27th Nov 1936 | Box 175 \ 4 img243 | |
| Letter from S. Smith & Sons regarding a thermometer tubing arrangement. | 14th Dec 1926 | Box 175 \ 4 img244 | |
| Letter to S. Smith & Sons regarding the supply of thermometers with armoured flexible tubing for test cars. | 15th Dec 1936 | Box 175 \ 4 img245 | |
| Letter from S. Smith & Sons regarding sending a thermometer with armoured flexible tubing. | 17th Dec 1936 | Box 175 \ 4 img246 | |
| Official order for a combined thermometer and oil pressure gauge. | 18th Dec 1936 | Box 175 \ 4 img247 | |
| Official order for a standard Bentley thermometer with special tubing. | 19th Jan 1937 | Box 175 \ 4 img248 | |
| Request to order one dozen thermometers with a range of 0-110°C for laboratory use. | 22th Mar 1937 | Box 175 \ 4 img249 | |
| Failed water temperature thermometer capillary, requesting a replacement and suggesting a reinforced support for the joint. | 9th Apr 1937 | Box 175 \ 4 img250 | |
| Request to place an official order with S.Smith & Sons Ltd. for a Bentley thermometer for DB.1360. | 15th Apr 1937 | Box 175 \ 4 img251 | |
| Letter to S. Smith & Sons Ltd. ordering a Bentley water temperature thermometer and discussing a breakage issue with a previous one. | 15th Apr 1937 | Box 175 \ 4 img252 | |
| Letter from S. Smith & Sons requesting further particulars for a Bentley instrument, as they cannot trace the provided part number. | 17th Apr 1937 | Box 175 \ 4 img253 | |
| Letter to S. Smith & Sons regarding a missing drawing for a thermometer and requesting its despatch. | 19th Apr 1937 | Box 175 \ 4 img254 | |
| Letter to S. Smith & Sons requesting a specific Ph.III thermometer and a corresponding drawing. | 30th Apr 1937 | Box 175 \ 4 img255 | |
| Covering order for a thermometer supplied by S.Smith & Sons. | 30th Apr 1937 | Box 175 \ 4 img256 | |
| Request to arrange for the repair of a Negretti & Zambra thermometer and its return to test bed No.5. | 30th Apr 1937 | Box 175 \ 4 img257 | |
| Letter from S. Smith & Sons confirming receipt of an order for a thermometer and advising a drawing will follow. | 3rd May 1937 | Box 175 \ 4 img258 | |
| Letter from S. Smith & Sons requesting clarification on a drawing for a thermometer. | 4th May 1937 | Box 175 \ 4 img259 | |
| Letter to S. Smith & Sons Ltd. regarding a request for a drawing showing the strengthening of a thermometer capillary. | 6th May 1937 | Box 175 \ 4 img260 | |
| Return of five Negretta & Zambra thermometers for repair and overhaul. | 7th May 1937 | Box 175 \ 4 img261 | |
| Letter from S. Smith & Sons regarding a query about strengthening and the inability to provide a modified drawing. | 8th May 1937 | Box 175 \ 4 img262 | |
| The purchase of six glass thermometers. | 10th May 1937 | Box 175 \ 4 img263 | |
| Covering order for a verbally ordered Bentley thermometer. | 19th May 1937 | Box 175 \ 4 img264 | |
| Requesting the return of two faulty Negretti & Zambra thermometers to the maker for repair. | 20th May 1937 | Box 175 \ 4 img265 | |
| Returning a broken Negretti & Zambra thermometer for repair, which was used on car 3.B.lV. | 27th May 1937 | Box 175 \ 4 img266 | |
| Letter to S. Smith & Sons Ltd. regarding modifications to a Ph.III radiator thermometer scale. | 14th Jun 1937 | Box 175 \ 4 img267 | |
| Letter from S. Smith & Sons regarding a previous correspondence about thermometers. | 15th Jun 1937 | Box 175 \ 4 img268 | |
| Instruction on coiling capillary tubing for water thermometers fitted to Bentley experimental cars. | 15th Jun 1937 | Box 175 \ 4 img269 | |
| Covering order to Messrs S.Smith & Sons for modified thermometers and gauges. | 15th Jun 1937 | Box 175 \ 4 img270 | |
| Method of coiling water temperature thermometer capillary tubing on Bentley cars to prevent breakage. | 15th Jun 1937 | Box 175 \ 4 img271 | |
| Letter to S. Smith & Sons Ltd. regarding the return of an incorrect instrument and the urgent need for the correct replacement. | 1st Jul 1937 | Box 175 \ 4 img272 | |
| Letter from S. Smith & Sons (Motor Accessories) Ltd regarding the dispatch of a special thermometer. | 2nd Jul 1937 | Box 175 \ 4 img273 | |
| Status of thermometers brought from the Cricklewood location. | 5th Jul 1937 | Box 175 \ 4 img274 | |
| Instructions for standardising parts for thermometers with flexible capillary. | 6th Jul 1937 | Box 175 \ 4 img275 | |
| Requesting the fitting of three Negretti & Zambra thermometers to a Wraith III car for France. | 12th Jul 1937 | Box 175 \ 4 img276 | |
| Return of two Bentley thermometers for alteration and repair to S.Smith & Sons. | 12th Jul 1937 | Box 175 \ 4 img277 | |
| Order to be sent to Messrs S.Smith & Sons Ltd. for thermometer and gauge parts and repairs. | 12th Jul 1937 | Box 175 \ 4 img278 | |
| Letter to S. Smith & Sons Ltd. regarding the return of two Bentley thermometers for repair and providing feedback on a sample dial. | 12th Jul 1937 | Box 175 \ 4 img279 | |
| Requesting the return of a Phantom III thermometer to Messrs. S.Smith & Sons Ltd. for repair and modification. | 13th Jul 1937 | Box 175 \ 4 img280 | |
| The careful handling required for Negretti & Zambra thermometers to prevent capillary damage. | 13th Jul 1937 | Box 175 \ 4 img281 | |
| Returning a damaged Negretti & Zambra thermometer for repair due to a chafed and worn capillary. | 13th Jul 1937 | Box 175 \ 4 img282 | |
| Official order for the repair and modification of a Phantom III thermometer. | 13th Jul 1937 | Box 175 \ 4 img283 | |
| Letter regarding the return and requested modification of a faulty Phantom III thermometer and oil gauge unit. | 13th Jul 1937 | Box 175 \ 4 img284 | |
| Letter from S. Smith & Sons acknowledging a previous letter regarding thermometers. | 13th Jul 1937 | Box 175 \ 4 img285 | |
| Order to dispatch a Phantom III thermometer to S. Smith & Sons Ltd. for repairs. | 19th Jul 1937 | Box 175 \ 4 img286 | |
| Letter from S. Smith & Sons requesting a copy of drawing D.75953 to proceed with an order for various instruments. | 19th Jul 1937 | Box 175 \ 4 img287 | |
| Letter from S. Smith & Sons (Motor Accessories) Ltd regarding the modification of a combined thermometer and oil gauge unit. | 21th Jul 1937 | Box 175 \ 4 img288 | |
| Letter to S. Smith & Sons regarding the forwarding of drawing D.75953. | 26th Jul 1937 | Box 175 \ 4 img289 | |
| Letter to S. Smith & Sons Ltd. requesting a quotation for modified thermometers. | 28th Jul 1937 | Box 175 \ 4 img290 | |
| Letter from S. Smith & Sons regarding a query about a red line marking on a product. | 29th Jul 1937 | Box 175 \ 4 img291 | |
| Fractured special thermometer on a 32-EX Phantom III. | 5th Aug 1937 | Box 175 \ 4 img292 | |
| Standardisation of a modified radiator thermometer dial for various car models. | 4th Aug 1937 | Box 175 \ 4 img293 | |
| Proposal for a Phantom III Oil Gauge and Thermometer dial. | 9th Aug 1937 | Box 175 \ 4 img294 | |
| Despatch of a special Phantom III thermometer and oil gauge unit for examination. | 17th Aug 1937 | Box 175 \ 4 img295 | |
| Modified Phantom III thermometer and oil pressure gauge dial to prevent owner concern about water temperature. | 17th Aug 1937 | Box 175 \ 4 img296 | |
| Order for a Phantom III thermometer and oil pressure gauge unit from Messrs S. Smith & Sons. | 23th Aug 1937 | Box 175 \ 4 img297 | |
| Letter to S. Smith & Sons Ltd. requesting a modified Phantom III gauge unit with a hand-painted dial without numerals. | 21th Aug 1937 | Box 175 \ 4 img298 | |
| Letter from S. Smith & Sons Ltd requesting a blueprint for a thermometer and oil pressure gauge unit. | 24th Aug 1937 | Box 175 \ 4 img299 | |
| Letter to S. Smith & Sons Ltd. regarding a blueprint request and chasing outstanding deliveries of thermometers and an oil gauge. | 25th Aug 1937 | Box 175 \ 4 img300 | |
| Letter from S. Smith & Sons acknowledging receipt of a letter regarding a Thermometer and Oil Pressure Gauge Unit to D.75953. | 23th Aug 1937 | Box 175 \ 4 img301 | |
| Return of a damaged Negretti & Zambra thermometer for repair. | 25th Aug 1937 | Box 175 \ 4 img302 | |
| Approval and supply of a revised thermometer and oil pressure gauge for the Phantom III. | 25th Aug 1937 | Box 175 \ 4 img303 | |
| Letter from S. Smith & Sons regarding the shipment of a thermometer to fulfil order No.44967. | 30th Aug 1937 | Box 175 \ 4 img304 | |
| Letter from S. Smith & Sons to Rolls-Royce Ltd. clarifying the status of orders for several instruments. | 1st Sep 1937 | Box 175 \ 4 img305 | |
| Standardisation of a water temperature thermometer with a flexible capillary. | 26th May 1937 | Box 175 \ 4 img306 | |
| Standardisation proposal for a flexible atmospheric temperature thermometer. | 15th Sep 1931 | Box 175 \ 4 img307 | |
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