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 two of a letter discussing the manufacturing of diaphragm bellows for thermostats.
| Identifier | ExFiles\Box 137\2\ scan0196 | |
| Date | 1st November 1938 guessed | |
| Page 2 Messrs. Rolls-Royce Ltd. he made very close contact with the bellows manufacturing concerns. It appears that the reason that the diaphragm bellows was adopted was because General Motors objected very strongly to the bellows ring which exists in the U.S.A., and determined to make thermostats without bellows. We hear also from other well informed sources that these diaphragm bellows are infinitely more troublesome than the hydraulically formed or rolled type previously employed, which is what we would have expected in view of the number of joints used in their construction. Yours truly, THE BRITISH THERMOSTAT CO. LTD. [Signature] W.Martin-Hurst. | ||