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 to The A.T. Speedometer Co. inquiring about specific drive revolutions per mile for their speedometers.
| Identifier | ExFiles\Box 59\2\ Scan115 | |
| Date | 23th March 1931 | |
| X6051 EFC1/AD. 23rd March, 1931. The A.T. Speedometer Co. Chronos Works, North Circular Rd. London, N.W.2. Dear Sirs, Drive Revolutions per indicated mile of A.T. Speedometers. In our EFC4/AD. of December 11th last we enquired from you the complete range of possible figures of drive revolutions per indicated mile between the limits 680 to 820 and in your answer dated December 22nd you gave us figures covering the range 765 to 810 only. It is necessary for us to know the possible figures between 810 and 820 but in particular whether a figure of exactly 816 is possible. Naturally we should prefer this to apply if possible both to the trip and to the total. We await your comments with interest. Yours faithfully, FOR ROLLS-ROYCE LIMITED. | ||