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).
Recalibration of a Wraith speedometer.
| Identifier | ExFiles\Box 165\2\ img104 | |
| Date | 12th July 1937 | |
| To HPS{Horace Percy Smith - Experimental Factory Mgr}/CEP. C. to WSt/CAP. 6051 Rm{William Robotham - Chief Engineer}/Wst.12/JH.12.7.37. re Wraith Speedometer No.S.920. Will you please arrange for the above A.T. instrument to be returned to the maker for recalibration: the revs/mile to be altered from 772 to 776. We should like this instrument to be as accurate as possible at 30 m.p.h. but certainly not slow. Rm{William Robotham - Chief Engineer}/Wst. WSt | ||