The re-calibration of a Wraith speedometer, specifying a change in rev/mile and accuracy.
| Identifier | ExFiles\Box 165\2\ img105 | |
| Date | 13th July 1937 | |
| To D {John DeLooze - Company Secretary} /RR. from HPS {Horace Percy Smith - Experimental Factory Mgr} /WSC. {W. S. Cassel} Keywords Rm {William Robotham - Chief Engineer} /Wst. 6051, HPS {Horace Percy Smith - Experimental Factory Mgr} /WSC. {W. S. Cassel} 21/BA.13.7.37 O {Mr Oldham} /54127 Wraith Speedometers. We hand you herewith:- 1 A.T.Speedometer No.S.920. Will you please arrange to despatch same to the makers for re-calibration rev/mile to be altered from 772/776. We would like you to point out that we should like this instrument to be as accurate as possible at 30 m.p.h, but certainly not slow. HPS {Horace Percy Smith - Experimental Factory Mgr} /WSC. {W. S. Cassel} | ||
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).