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).
The re-calibration of a Wraith speedometer to suit a new rear axle ratio.
| Identifier | ExFiles\Box 165\2\ img179 | |
| Date | 17th June 1938 | |
| 605-1 To D/HP. from HPS{Horace Percy Smith - Experimental Factory Mgr}/WSC.{W. S. Cassel} cr{Mr Cra???ster / Mr Chichester} Hd{Mr Hayward/Mr Huddy}/FC. cr{Mr Cra???ster / Mr Chichester} Roy.{Sir Henry Royce} c. Rm{William Robotham - Chief Engineer}/RC.{R. Childs} R Childs HPS{Horace Percy Smith - Experimental Factory Mgr}/WSC.{W. S. Cassel}8/VS.{J. Vickers}17.6.38. O/52435. WRAITH SPEEDOMETER. We hand you herewith :- 1 A.T. Speedometer No.S.919. Will you please return same to the makers for re-calibration, from its present value of 776 R.P.M. to 732 R.P.M. This is required to suit a rear axle ratio of 8 x 34. Will Roy.{Sir Henry Royce} please place an official order for this work to be carried out. HPS{Horace Percy Smith - Experimental Factory Mgr}/WSC.{W. S. Cassel} | ||