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 S. Smith & Sons (Accessories) Ltd. discussing the performance of two 'Smithermets' (shutter thermostats).
| Identifier | ExFiles\Box 39\4\ Scan231 | |
| Date | 5th February 1931 | |
| TELEPHONE: EAST 0149. x3499. S. SMITH & SONS (MOTOR ACCESSORIES) LTD., BIRMINGHAM WORKS. HEAD OFFICE: CRICKLEWOOD WORKS, LONDON, N.W. 2. Reply to:- 173-177, CLIFTON ROAD, ASTON, BIRMINGHAM. OUR REF. FGE/ELG. 5th Feb., 1931. YOURS Messrs. Rolls Royce Ltd., Nightingale Rd., Derby. Dear Sirs, SHUTTER THERMOSTATS. For the attention of Mr. H.{Arthur M. Hanbury - Head Complaints} Royce. We are despatching under separate cover two Smithermets in accordance with your request. These are both arranged to commence to thrust at 80 degrees centigrade, and are both filled with "J" Spirit, and so stamped. The performance of these instruments is as follows:- 80 degrees cent: neutral, ie:- no pull or thrust at bottom of stroke. 90 " " 17.5 lbs: thrust at end of stroke .425". 100 " " 46.0 " " " " " " " ". The thrust available at say 90° at the bottom or commencement of the stroke is naturally greater than the above figure. The second "J" instrument was asked for by Mr. Robotham. With regard to your modified drawing E.80893, and the note inscribed, we should like to point out that if the central member of the instrument is required to commence to move at 74/76 degrees, it will not travel to the end of its stroke .425" at the same temperature, partly because of the natural Continued:- RECEIVED 6 FEB 1931 | ||