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. providing suggestions on valve temperature settings and manufacturing.
| Identifier | ExFiles\Box 156\1\ scan0076 | |
| Date | 24th April 1935 guessed | |
| - 3 - Messrs. Rolls-Royce Limited. (1). We suggest that you should fix the opening temperature at a definite point, and at the same time provide an adjustment on the valve head to make this possible. (2). We suggest that you fix the maximum temperature at which the valve is to be full open and consider satisfactory any instruments in which the valve is full open at a lower temperature. (3). We suggest that the bellows length be suitably increased so that a simple charge may be employed to give the specified difference between the open and full open temperatures. We would point out that our observations are based on the weekly manufacture of roughly 2,000 instruments of the type under discussion, any one of which will pass the tests outlined, and all of which give entirely satisfactory operation in service, with scarcely any temperature variation of the cooling system. By tightening up the limits we cannot see that any useful purpose is served, and if this is done the manufacture is made exceedingly difficult, and, unless a high price is charged, unprofitable. We shall be pleased to have your views in due course. Yours truly, THE BRITISH THERMOSTAT CO. LTD. W. Martin-Hurst. | ||