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).
Test results for speedometer number B.247.D.730, tested in a new box with a fan.
| Identifier | ExFiles\Box 50\4\ Scan203 | |
| Date | 14th June 1928 guessed | |
| -2- (3) TEST ON SPEEDOMETER NO.B.247.D.730. 15/52. TESTED IN NEW BOX WITH FAN IN. Heater. Thermometer. Temp.(ºC). M.P.H.at 600 R.P.M. -- Left 17.3 49.8 -- right. 18.5 49.7 Centre Left 30.0 48.1 " Right. 30.0 48.1 Left. Right. 30.0 48.2 EFC. {E. Fowler Clarke - Electrical Engineer} | ||