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).
Change in specification for Wraith speedometers due to an alteration in tyre size.
| Identifier | ExFiles\Box 165\2\ img067 | |
| Date | 14th April 1937 | |
| 6065 HPS{Horace Percy Smith - Experimental Factory Mgr}/WSC.{W. S. Cassel} from Rm{William Robotham - Chief Engineer}/Wst. Rm{William Robotham - Chief Engineer}/Wst.12/AP.14.4.37 WRAITH SPEEDOMETERS. Will you please note that the two new speedometers you have on order for the new chassis being built up should be arranged for 798 revs. per mile, as the tyres on the new chassis have been altered from 7" to 6.5". Rm{William Robotham - Chief Engineer}/Wst. | ||