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. regarding the design and manufacturing of thermostats, part number E. 86612, for a cooling system.
| Identifier | ExFiles\Box 156\1\ scan0074 | |
| Date | 16th April 1935 | |
| X1328 Telephone: SUNBURY 456 (4 LINES). Codes: BENTLEY'S, WESTERN UNION. Telegrams & Cables: THERMOSTAT, SUNBURY COMMON. [Logo: FBI INCORPORATED BY ROYAL CHARTER] THE BRITISH THERMOSTAT CO, LTD. Makers of Scientific Instruments. [Logo: MEMBERS OF THE NATIONAL UNION OF MANUFACTURERS] DIRECTORS: M. {Mr Moon / Mr Moore} PAYNE, W. A. {Mr Adams} PAYNE, J. {Mr Johnson W.M.} E. {Mr Elliott - Chief Engineer} SHERLOCK, L. S. SWINNERTON-DYER. TEDDINGTON WORKS. Windmill Road, Sunbury, Middlesex. W.M.H/GN: April 16th, 1935. Messrs. Rolls-Royce Limited, DERBY. Dear Sirs, Thermostats - Part No. E. {Mr Elliott - Chief Engineer} 86612. [Watermark: COLNE VALLEY] We thank you for your letter of the 15th April. We did not realise that the above thermostats were to be used for controlling the temperature of the water in the cooling system. We have examined the layout shown on the drawing enclosed with your last letter, and think that the following facts relative to the thermostats which we are at present manufacturing for this purpose may be of interest to you. In the first place, it is customary to arrange for the top plate of the bellows, or some part attached thereto, to contact with a facing, thereby closing off the water flow through the by-pass when the main valve controlling the passage from the cylinder head to the radiator is fully open. This condition appears to be satisfied by the arrangement shown on your drawing. It is usual to specify a certain minimum lift for the main valve head, this lift for the construction now under consideration being equal to the lift of the bypass valve. There is no objection to the minimum lift being exceeded, and it is customary for this to be done. It is also usual for the valve head to be | ||