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).
Graph showing the performance of a Phantom AT Eddy Current Speedometer, plotting instrument reading against temperature.
| Identifier | ExFiles\Box 50\4\ Scan251 | |
| Date | 1st October 1928 | |
| INSTRUMENT READING AT 600 RPM (MILES PER HOUR) PERFORMANCE OF PHANTOM AT EDDY CURRENT SPEEDOMETERS Speedometer c/o B 919 742 15/52 Small type dial 1.10.28 INSTRUMENT TEMPERATURE (DEGREES CENTIGRADE) 16/52 AXLE 20 HP 11/50 AXLE 15/52 AXLE 14/52 AXLE N.B. The heights of the thin horizontal lines represent the correct reading for the three axle ratios specified thereon. | ||