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).
The testing of a Watford speedometer for 18-GIV, noting a 3% reading discrepancy.
| Identifier | ExFiles\Box 165\4\ img113 | |
| Date | 26th October 1931 | |
| X6129 Hs{Lord Ernest Hives - Chair}/CWH. from Hs{Lord Ernest Hives - Chair}/Wst... c.c. hs{Lord Ernest Hives - Chair}/ltd. [text crossed out] Hs{Lord Ernest Hives - Chair}/Wst.3/AD26.10.31. WATFORD SPEEDOMETER. The Watford speedometer is now fitted to 18-GIV for test. As arranged by the makers, it reads correct both mileage and speed at 785 turns per mile. Our standard drive, however, is arranged for 810 turns per mile so that this instrument will read approximately 3% fast. In the event of this speedometer being standardised we shall arrange for the turns per mile to be altered in accordance with our standard. Hs{Lord Ernest Hives - Chair}/Wst [Circular stamp: RECEIVED 27 OCT 1931] | ||