| Description | Date | Identifier | |
| Graph plotting load versus temperature from various thermostat tests. | 1st Apr 1930 | Box 39 \ 4 Scan115 | |
| Blank page with a Print Room stamp. | 7th Apr 1930 | Box 39 \ 4 Scan116 | |
| Letter from S. Smith & Sons acknowledging correspondence regarding 'SmitherMet' and advising a reply will come from their Birmingham House. | 9th Apr 1930 | Box 39 \ 4 Scan117 | |
| Letter from S. Smith & Sons regarding the liquid (Acetone) used in sample thermostats and offering solutions for increasing power. | 11th Apr 1930 | Box 39 \ 4 Scan118 | |
| Adjustment for the radiator shutter and starting carburetter controls to suit varying scuttle depths. | 1st Apr 1930 | Box 39 \ 4 Scan119 | |
| Confirming the retention of the Calorstat and requesting the necessary order be passed. | 28th Apr 1930 | Box 39 \ 4 Scan120 | |
| Confirming a previous communication regarding an invoice for a Calorstat sample from S.Smith and Sons Ltd. | 24th Apr 1930 | Box 39 \ 4 Scan121 | |
| Thermostat-controlled English and American radiator shutters and proposed improvements. | 30th Apr 1930 | Box 39 \ 4 Scan122 | |
| Testing and optimal operating temperatures for car shutter thermostats and louvres. | 1st May 1930 | Box 39 \ 4 Scan123 | |
| Letter to a supplier requesting a Calorstat that operates at a lower temperature. | 7th May 1930 | Box 39 \ 4 Scan124 | |
| Letter to S. Smith & Sons regarding specifications for a Calorstat bellows. | 7th May 1930 | Box 39 \ 4 Scan125 | |
| Letter from S. Smith & Sons (Motor Accessories) Ltd acknowledging receipt of letters regarding 'SMITHERMET'. | 8th May 1930 | Box 39 \ 4 Scan126 | |
| Letter from S. Smith & Sons discussing thermostat performance specifications and alternatives. | 9th May 1930 | Box 39 \ 4 Scan127 | |
| Modified double-acting thermostat and water spreader for radiator shutters. | 24th May 1930 | Box 39 \ 4 Scan128 | |
| Requesting an approximate delivery date for chassis 26-EX, discussing a dull finish for the radiator shutters and ordering fittings. | 19th Jun 1930 | Box 39 \ 4 Scan129 | |
| Request for radiator shutters on car 26-EX to have a dull untarnishable finish. | 21th Jun 1930 | Box 39 \ 4 Scan130 | |
| Modifications to the thermostatically operated shutters for the 25 HP model. | 5th Jul 1930 | Box 39 \ 4 Scan131 | |
| Instruction to use dull staybright radiator shutters on model 26-EX, citing issues with the previous matt finished nickel shutters. | 10th Jul 1930 | Box 39 \ 4 Scan132 | |
| Letter to a supplier regarding trouble with a sylphon element used in thermostatically operated shutters. | 12th Aug 1930 | Box 39 \ 4 Scan133 | |
| Letter from S. Smith & Sons acknowledging a query about thermostatically operated radiator shutters. | 13th Aug 1930 | Box 39 \ 4 Scan134 | |
| Blueprint showing the suggested location of a large Smithermet component. | 17th May 1930 | Box 39 \ 4 Scan135 | |
| Letter from S. Smith & Sons regarding modifications for shutter operating thermostats. | 19th Aug 1930 | Box 39 \ 4 Scan136 | |
| Letter to S. Smith & Sons, Ltd. regarding the trial and order of large diameter thermostats for experimental cars. | 25th Aug 1930 | Box 39 \ 4 Scan137 | |
| Internal request to the Order Office to purchase two thermostats from S. Smith & Sons Ltd. | 25th Aug 1930 | Box 39 \ 4 Scan138 | |
| Letter from S. Smith & Sons regarding the design of shutter operating thermostats. | 26th Aug 1930 | Box 39 \ 4 Scan139 | |
| Blueprint for a 'Swithermet' case (S.V. 70 Large Type). | 4th Sep 1930 | Box 39 \ 4 Scan140 | |
| Blueprint of a flexible metal bellows assembly, model SV70 Large Type. | 4th Sep 1930 | Box 39 \ 4 Scan141 | |
| Bench tests to investigate lag and hysteresis in thermostat radiator shutters. | 26th Aug 1930 | Box 39 \ 4 Scan142 | |
| Shutter friction losses and the operational characteristics of different shutter systems on a car. | 26th Aug 1930 | Box 39 \ 4 Scan143 | |
| Thermostat shutter testing, detailing operating temperatures and suggestions for improvement. | 26th Aug 1930 | Box 39 \ 4 Scan144 | |
| Blueprint showing the suggested location of a large smithery. | 28th Aug 1930 | Box 39 \ 4 Scan145 | |
| Radiator shutter friction, rejecting the suggestion of a closing spring in favour of modifying the lower bearing design. | 31th Aug 1930 | Box 39 \ 4 Scan146 | |
| Modifications to the radiator shutter bottom bearings for the 20/25HP model. | 1st Sep 1930 | Box 39 \ 4 Scan147 | |
| Proposal to reduce friction in radiator shutters by modifying the parallel linkage. | 8th Sep 1930 | Box 39 \ 4 Scan148 | |
| Blueprint drawing of shutter operating toggles. | 8th Sep 1930 | Box 39 \ 4 Scan149 | |
| Cover stamped by the Print Room in Derby. | 8th Sep 1930 | Box 39 \ 4 Scan150 | |
| Test report on a thermostat fitted with a spring to operate the radiator shutters on a 25-EX radiator. | 8th Sep 1930 | Box 39 \ 4 Scan151 | |
| Letter from S. Smith & Sons regarding blue prints and samples for a larger radiator thermostat. | 9th Sep 1930 | Box 39 \ 4 Scan152 | |
| Outstanding issues with the Phantom II Left Hand Chassis following extended testing. | 9th Sep 1930 | Box 39 \ 4 Scan153 | |
| Faults and modifications for the clutch, carburetter, and brakes on experimental vehicles. | 12th Sep 1930 | Box 39 \ 4 Scan154 | |
| From Sg. to Hs. chasing a decision on thermostat radiator shutters for chassis being manufactured for America. | 12th Sep 1930 | Box 39 \ 4 Scan155 | |
| Modifications and performance issues related to thermostat-controlled shutters. | 12th Sep 1930 | Box 39 \ 4 Scan156 | |
| Graph plotting load tests on a Smith's Calorstat, showing performance with and without a return spring against temperature. | 9th Sep 1930 | Box 39 \ 4 Scan157 | |
| Page with very faint, illegible text, featuring a clear stamp from the T. Room in Derby. | 12th Sep 1930 | Box 39 \ 4 Scan158 | |
| Modifications and tests on thermostat radiator shutters, including friction reduction and the fitting of a return spring. | 18th Sep 1930 | Box 39 \ 4 Scan159 | |
| Design requirements for thermostatically controlled shutters. | 15th Sep 1930 | Box 39 \ 4 Scan160 | |
| Design requirements for thermostatically controlled radiator shutters and radiator construction. | 16th Sep 1930 | Box 39 \ 4 Scan161 | |
| Use of unpolished 'Staybright' radiator shutters on experimental cars. | 20th Sep 1930 | Box 39 \ 4 Scan162 | |
| Radiator shutter friction and a proposed modification to the thermostat linkage. | 20th Sep 1930 | Box 39 \ 4 Scan163 | |
| Letter to S. Smith & Sons, Ltd. regarding test results and requirements for a radiator Calorstat (thermostat). | 25th Sep 1930 | Box 39 \ 4 Scan164 | |
| Letter discussing shutter friction and the requirement for a different liquid for the Calorstat. | 9th Sep 1930 | Box 39 \ 4 Scan165 | |
| Graph showing the results of tests on a Smith's Calorstat, plotting load against temperature. | 9th Sep 1930 | Box 39 \ 4 Scan166 | |
| Cover or reverse side with a date stamp from the Derby drawing room. | 25th Sep 1930 | Box 39 \ 4 Scan167 | |
| Requesting the substitution of a blueprint to correct an omission on a previous report. | 25th Sep 1930 | Box 39 \ 4 Scan168 | |
| Graph charting the results of Smith's Calorstat tests, plotting load against temperature. | 9th Sep 1930 | Box 39 \ 4 Scan169 | |
| Blank document page with a Print Room date stamp. | 25th Sep 1930 | Box 39 \ 4 Scan170 | |
| Letter from S. Smith & Sons regarding the supply and modification of R.V.60 radiator thermostats. | 27th Sep 1930 | Box 39 \ 4 Scan171 | |
| Letter to S. Smith & Sons, Ltd. regarding the return of two R.V.80 thermostats for modification. | 29th Sep 1930 | Box 39 \ 4 Scan172 | |
| Despatch of two radiator thermostats to S. Smith & Sons, Ltd. | 29th Sep 1930 | Box 39 \ 4 Scan173 | |
| Letter from S. Smith & Sons regarding the alteration of two R.V.60 thermostats and instructions for a larger order of 285 instruments. | 30th Sep 1930 | Box 39 \ 4 Scan174 | |
| Test results for a large type Smith's Calorstat, detailing load requirements at various temperatures. | 2nd Oct 1930 | Box 39 \ 4 Scan175 | |
| Graph plotting temperature against pull and push forces for Smith's Calorstat tests on a large type model. | 2nd Oct 1930 | Box 39 \ 4 Scan176 | |
| Back cover of a document with a handwritten reference and a print room stamp. | 8th Oct 1930 | Box 39 \ 4 Scan177 | |
| Corrosion issues with unpolished Staybright radiator shutters and proposed experimental finishes. | 3rd Oct 1930 | Box 39 \ 4 Scan178 | |
| Letter to S. Smith & Sons regarding the suitability of standard thermostat fillings pending test results. | 7th Oct 1930 | Box 39 \ 4 Scan179 | |
| Letter from S. Smith & Sons concerning the despatch and testing of two modified R.V.60 thermostats, including a data table of their thrust measurements. | 14th Oct 1930 | Box 39 \ 4 Scan180 | |
| Continuation page of a letter from S. Smith & Sons (Motor Accessories) Ltd. | 22th Oct 1930 | Box 39 \ 4 Scan181 | |
| Thermostat tests and recommendations for the 40/50 model. | 22th Oct 1930 | Box 39 \ 4 Scan182 | |
| The loads experienced by a shutter bearing during operation. | 22th Oct 1930 | Box 39 \ 4 Scan183 | |
| Blueprint graph and table detailing the performance of Thermostat Operated Shutters for the Phantom II model. | 23th Oct 1930 | Box 39 \ 4 Scan184 | |
| Heavily faded and almost entirely unreadable document page with a date stamp. | 23th Oct 1930 | Box 39 \ 4 Scan185 | |
| Recommending the procurement of calorstats with 'B' filling, including initial test data on loads at various temperatures. | 22th Oct 1930 | Box 39 \ 4 Scan186 | |
| Test results for Smith's Calorstat, measuring load required to maintain bellows in open and closed positions. | 23th Oct 1930 | Box 39 \ 4 Scan187 | |
| Graph showing the results of tests on a Smith's Calorstat, comparing performance with and without a return spring. | 9th Sep 1930 | Box 39 \ 4 Scan188 | |
| Graph showing results of Smith's Calorstat tests with special fillings, plotting temperature against pull and push forces. | 23th Oct 1930 | Box 39 \ 4 Scan189 | |
| Thermostat modifications and their effect on petrol consumption and engine performance. | 27th Oct 1930 | Box 39 \ 4 Scan190 | |
| Three separate thermostat tests, recording temperature readings at set intervals. | 20th Oct 1930 | Box 39 \ 4 Scan191 | |
| Test results for thermostat operating temperatures and vehicle acceleration. | 12th Nov 1930 | Box 39 \ 4 Scan192 | |
| Thermostat and carburation issues, comparing water-heated and exhaust-heated throttles on the Phantom II. | 12th Nov 1930 | Box 39 \ 4 Scan193 | |
| Engine carburation performance, water temperature, and required alterations for different conditions. | 14th Nov 1930 | Box 39 \ 4 Scan194 | |
| The return of a 'Smithermet' part to a supplier to be filled with a special liquid. | 14th Nov 1930 | Box 39 \ 4 Scan195 | |
| Letter to supplier Messrs. S. Smith & Sons, Ltd. regarding an order and development of Calorstats. | 14th Nov 1930 | Box 39 \ 4 Scan196 | |
| Letter from S. Smith & Sons regarding the despatch and specifications of a thermostat. | 17th Nov 1930 | Box 39 \ 4 Scan197 | |
| Graph showing the test results for the RV60 thermostat with 'C' filling, plotting temperature against load. | 15th Nov 1930 | Box 39 \ 4 Scan198 | |
| Letter from S. Smith & Sons regarding proceeding with an E.81540 type of Smithermet and the spirit used in different instruments. | 17th Nov 1930 | Box 39 \ 4 Scan199 | |
| Implementation of thermostatically operated shutters on new cars. | 20th Nov 1930 | Box 39 \ 4 Scan200 | |
| Concerns about engine operating temperature due to thermostatically operated shutters. | 22th Nov 1930 | Box 39 \ 4 Scan201 | |
| Page 2 of a typed document discussing the adjustment of thermostatic control. | 25th Nov 1930 | Box 39 \ 4 Scan202 | |
| Development and compromises of thermostatically controlled shutter and induction systems. | 25th Nov 1930 | Box 39 \ 4 Scan203 | |
| Design and operating temperature of thermostatically controlled shutters. | 26th Nov 1930 | Box 39 \ 4 Scan204 | |
| Recommendation on using countersunk rivets to attach a stiffening frame to an aluminium sheet. | 29th Nov 1930 | Box 39 \ 4 Scan205 | |
| Thermostat settings and filling for the Phantom II model. | 29th Nov 1930 | Box 39 \ 4 Scan206 | |
| Internal order request for one Smith Type B.40 'Smithermet' Bellows. | 2nd Dec 1930 | Box 39 \ 4 Scan207 | |
| Thermostatically controlled shutters, carburation, and silencers for 25HP and 45HP cars. | 11th Dec 1930 | Box 39 \ 4 Scan208 | |
| Letter from S. Smith & Sons regarding the despatch and specifications of a shutter thermostat, type E.80893. | 12th Dec 1930 | Box 39 \ 4 Scan209 | |
| Urging for a decision on 'Smithermets' for Phantom II radiator shutters to prevent production delays. | 15th Dec 1930 | Box 39 \ 4 Scan210 | |
| Agreeing to proceed with specified quantities of 'B' filling for Smithermets thermostats. | 15th Dec 1930 | Box 39 \ 4 Scan211 | |
| Petrol consumption of a 20 HP car related to its thermostatically operated shutters and running temperature. | 16th Dec 1930 | Box 39 \ 4 Scan212 | |
| Alternative 'H' filling for thermostats from Messrs. Smith & Sons. | 18th Dec 1930 | Box 39 \ 4 Scan213 | |
| Graph showing the results of Smith's Calorstat tests with special fillings. | 23th Oct 1930 | Box 39 \ 4 Scan214 | |
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