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).
Speedometer for car 14.B.V. following an axle ratio change.
| Identifier | ExFiles\Box 98\5\ scan0094 | |
| Date | 1st September 1939 | |
| 400g To Rm{William Robotham - Chief Engineer}/IMW.{Ivan M. Waller - Head of Chateauroux} from HPS{Horace Percy Smith - Experimental Factory Mgr}/WSC.{W. S. Cassel} c. Rm{William Robotham - Chief Engineer}/RC.{R. Childs} HPS{Horace Percy Smith - Experimental Factory Mgr}/WSC.{W. S. Cassel}1/BA.1.9.39. 14.B.V. - Speedometer. We have changed the axle ratio on the above car to 10 x 41. This means that the Speedometer will require changing. You will recollect that when this car first went out it had a temporary instrument fitted and the correct one was sent on to you, this instrument, the one originally fitted, will be O.K. for this changeover of axle ratio, will you, therefore, please arrange to fit same, when you next go out to France. HPS{Horace Percy Smith - Experimental Factory Mgr}/WSC.{W. S. Cassel} | ||