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. regarding issues with thermostats and proposed modifications.
| Identifier | ExFiles\Box 156\1\ scan0173 | |
| Date | 21th April 1937 | |
| Telephone: SUNBURY-ON-THAMES 456 (6 LINES). Telegrams & Cables: THERMOSTAT, SUNBURY-ON-THAMES. Code: BENTLEY'S 1328 THE BRITISH THERMOSTAT CO., LTD. Makers of Scientific Instruments. DIRECTORS: W. A.{Mr Adams} PAYNE, J.{Mr Johnson W.M.} E.{Mr Elliott - Chief Engineer} SHERLOCK, L. S. SWINNERTON-DYER, W. F.{Mr Friese} F.{Mr Friese} MARTIN-HURST. Windmill Road, TEDDINGTON WORKS. Sunbury on Thames, Middlesex. WMH/GN: Dictated April 20th. April 21st, 1937. Your Ref: Rm{William Robotham - Chief Engineer}/Std.13/AP: Messrs. Rolls-Royce Ltd. DERBY. Dear Sirs, For the attention of Mr.Steadman. We thank you for your letter dated April 19th. From your report it is evident that the small out-of-balance which exists in the standard Vauxhall pattern thermostat is causing the early opening. We are, therefore, arranging to send to you to-morrow two further Vauxhall thermostats, to which we have fitted special seats to reduce the diameter. One of these thermostats will have a seat 1.7/16" diameter, and the other 1.3/8" diameter. Both thermostats will be set to open at 85°C. If you find that the results given by either of these thermostats are satisfactory we can very easily modify the valve seat diameter to suit. This answers question 1. (2). The area of the by-pass of the thermostat shown on BGA.3357A is approximately .692 sq. inches. We take it that you do not wish this by-pass area to be reduced, as you can arrange to do this in the housing in which this thermostat would be fitted. The production price of this instrument is 5/6d. (3). We have pleasure to enclose a further copy of Drawing No. BGA.3357A. | ||