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).
Calibration results for a Light Weight Ben-Sports instrument at various temperatures.
Identifier | ExFiles\Box 59\2\ Scan274 | |
Date | 7th November 1933 | |
B.J.I.34 MEMORANDUM. A.T. SPEEDOMETER CO LTD., BRITISH JAEGER INSTRUMENTS. LTD. To Mr. Buckland. From Mr. Arrowsmith. 86051 Date 7/11/33 Light Weight Ben-Sports Instrument. Scale reading m.p.h. r.p.m. of drive. Temperature. Calibration. 62 800 65° C 149 F 2 miles Slow 64 800 20° C 68 F Correct 64 800 Minus 5° C 23 F " Material used for the Magnetic shunt is Monel Metal. "795 RPM is official - at 63mph new 2.15 ozs old 3.14 ozs | ||