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. responding to a complaint about thermostat failures caused by metal particles.
| Identifier | ExFiles\Box 123\2\ scan0105 | |
| Date | 30th May 1938 | |
| Telephone: SUNBURY-ON-THAMES 456 (6 LINES) Telegrams & Cables: THERMOSTAT, SUNBURY-ON-THAMES. Code: BENTLEY'S THE BRITISH THERMOSTAT CO., LTD. Makers of Scientific Instruments. DIRECTORS: COL. N. HUDSON. J.E. SHERLOCK } MANAGING. W.F.F. MARTIN-HURST } L.S. SWINNERTON DYER. F.G. POPLETT. TEDDINGTON WORKS. Windmill Road, Sunbury-on-Thames, Middlesex. ON A.I.D. AIR MINISTRY APPROVED LIST. WMH/GN: Your Ref: Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}2/JH: May 30th, 1938. Messrs. Rolls-Royce Ltd. Experimental Dept: DERBY. Dear Sirs, We thank you for your letter dated May 27th. We regret that it is not practicable in the existing thermostat to do away with the magnet as the satisfactory operation of the instrument is dependent on its use. Frankly, we think that the trouble due to the presence of metal particles is exaggerated in your mind. We have now supplied more than 12,000 of these thermostats and the number of cases that have been brought to our notice of genuine failures from all causes is less than 12. We know that filings were present in one or two of the thermostats first supplied, but we took such steps to prevent the possibility of entry of metal particles that your recent complaint was the first that had come to our notice for a very long time. You will agree that once the cover is in position there is no chance of any foreign matter getting in from outside, so that so long as sufficient care is taken that the switch is clean before it is | ||