Requesting the return of a Wraith speedometer for recalibration due to a new rear axle ratio.
| Identifier | ExFiles\Box 165\2\ img178 | |
| Date | 16th June 1938 | |
| To HPS {Horace Percy Smith - Experimental Factory Mgr} /WST. from Rm {William Robotham - Chief Engineer} /RC. {R. Childs} c. RC {R. Childs} /CAP. 6065 Rm {William Robotham - Chief Engineer} /RC. {R. Childs} 8/MH. {M. Huckerby} 16.6.38. RE WRAITH SPEEDOMETER. Will you please arrange for the return to the makers of a Wraith A.T. speedometer No.S.919 for alteration to suit the new rear axle ratio of 8/34. This means that the calibration of the instrument must be altered from its present value of 776 revs-per-mile to 732 revs-per-mile. Rm {William Robotham - Chief Engineer} /RC. {R. Childs} | ||
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).