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 discussing an instrument's operation and pressure readings for a shutter.
| Identifier | ExFiles\Box 39\4\ Scan228 | |
| Date | 20th January 1931 | |
| Y3499 TELEPHONE: EAST 0149. 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. YOURS HS{Lord Ernest Hives - Chair}/RM{William Robotham - Chief Engineer}2/MJ. [STAMP: RECEIVED 21 JAN 1931] 20th Jan., 1931. Messrs. Rolls Royce Ltd., Nightingale Rd., DERBY. Dear Sirs, We beg to thank you for your letter of the 19th instant, and note your requirements. We will let you have the instrument back in the course of the next few days. We presume that you are endeavouring to secure a running temperature of 85 degrees, and that you expect the instrument to overcome the resistance of the shutter. We shall take a reading of this instrument when it is completed, and expect that the available pressure will be as follows:- Degrees. Pressure - lbs. 80 0 85 7 1/2 90 15 95 24 100 33 We are of the opinion that in order to secure positive operation of the shutter between the critical temperatures of 85 to 90, the shutters will have to be very free in action, and we would ask you to consider the advisability of using the larger type of instrument, R.V.70, as it will not be so susceptible to differences in the frictional resistance of the shutter, or to the effect of air pressure on the shutter vanes. Continued:- | ||