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).
Page 2 of a letter from The British Thermostat Co. Ltd. regarding the design of bellows for thermostats.
| Identifier | ExFiles\Box 156\1\ scan0138 | |
| Date | 5th December 1935 guessed | |
| - 2 - Messrs. Rolls-Royce Limited. which would probably be the ideal, is made with a minimum wall thickness of .007", for which bellows the rate approaches 30 lbs. per ½" travel. We would make up a lighter bellows in this size if you required it, but pending the results of your own experiments, and bearing in mind that 2.7/8" o {Mr Oldham} /d would probably be too large in any case, we are not doing this until we hear from you. As soon as your experiments are completed, if you will let us know the results we will prepare a design of whichever type of thermostat you wish to try out. Yours truly, THE BRITISH THERMOSTAT CO. LTD. W.Martin-Hurst. ENCL: | ||