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).
Request to examine and recalibrate a speedometer from chassis 16-EX to correct a temperature error and make it read 10% fast.
| Identifier | ExFiles\Box 50\4\ Scan166 | |
| Date | 24th February 1928 | |
| EFC. {E. Fowler Clarke - Electrical Engineer} X4308 24.2.28. SPEEDOMETER OFF 16-EX. B.156 765 16/52 Will you please examine this instrument to see whether it is fitted with the latest alteration to overcome the temperature error. Yes. Will you also please check it for accuracy and alter it so that it reads 10% fast. When correct it should read 60 m.p.h. when the drive revolves at 700 r.p.m. i.e. we require it to read 66 m.p.h. at 700 r.p.m. (10% fast). A.J.Lidsey. 700 - 60 is 600 - 51.4 700 - 66 is 600 - 56.6 B156 | ||