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 plotting the performance of Phantom eddy current speedometers against varying temperatures.
| Identifier | ExFiles\Box 50\4\ Scan232 | |
| Date | 10th January 1929 | |
| INSTRUMENT READING AT 600 RPM (MILES PER HOUR) PERFORMANCE OF PHANTOM AT EDDY CURRENT SPEEDOMETERS INSTRUMENT TEMPERATURE (DEGREES CENTIGRADE) N.B. The heights of the thin horizontal lines represent the correct reading for the three axle ratios specified thereon. B.39 675 16/52 10.1.29 16/52 AXLE 20 HP 11/50 AXLE 15/52 AXLE 14/52 AXLE A.4208 | ||