From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Letter to S. Smith & Sons Ltd. regarding the testing of a 'Hexane' filled calorstat that operates at a lower temperature than the standard.
| Identifier | ExFiles\Box 156\2\ scan0186 | |
| Date | 6th February 1939 | |
| 1328 Experimental Dept. Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer}7/MH.{M. Huckerby} 6th. February, 1939. Messrs. S.Smith & Sons Ltd., Cricklewood Works, LONDON, N.W.2. For the attention of Mr. Eckford. Dear Sirs, We have tested "Hexane" filled calorstat you sent us recently and find that it gives water temperatures of 60°C to 70°C compared with 70°C to 78°C for the standard calorstat. Thus the operating temperatures are approximately 10°C too low with "Hexane". We are returning the "Hexane" calorstat to you in case you have an alternative filling or can modify it to reproduce the standard temperatures. Yours faithfully, for ROLLS-ROYCE LTD. | ||