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 from The British Thermostat Co. Ltd. regarding the testing and adjustment of six thermostats, including a table of results.
| Identifier | ExFiles\Box 156\1\ scan0069 | |
| Date | 10th April 1935 | |
| 4508 Stedman Telephone: SUNBURY 456 (4 LINES). Codes: BENTLEY'S, WESTERN UNION. Telegrams & Cables: THERMOSTAT, SUNBURY COMMON. THE BRITISH THERMOSTAT CO., LTD. Makers of Scientific Instruments. DIRECTORS: M. {Mr Moon / Mr Moore} PAYNE. W. A. {Mr Adams} PAYNE. J. {Mr Johnson W.M.} E. {Mr Elliott - Chief Engineer} SHERLOCK. L. S. SWINNERTON-DYER. TEDDINGTON WORKS. Windmill Road, Sunbury, Middlesex. W.M.H/GN: Your Ref: Hs {Lord Ernest Hives - Chair} /Std.10/KW: April 10th, 1935. Messrs. Rolls-Royce Limited, DERBY. Dear Sirs, Referring to your letter dated the 3rd April we are returning to you the six Thermostats covered by your Replacement Order No. R. {Sir Henry Royce} 7907. We have adjusted and tested these with great care, and they are now working as follows:- Temperature when extended to 1.525" Temperature when contracted to 1.275". No.1. 83.5°C. 74.4°C. 2. 84.4 75.2 3. 81.3 73.3 4. 84.1 74.6 5. 83.9. 74.6 6. 82.8 73. These figures while not being exactly to your specification, are as near as we can get using the assembly shown on your drawing. Although we wish to make no excuse for the fact that these thermostats were apparently originally delivered incorrectly adjusted, we would now like to draw your attention to the following points. In the manufacture of thermostats of this type there is available a limited number of straight or | ||