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).
Development of a silent (helical) three-speed gearbox on experimental car 14-EX and the number of experimental cars in use.
| Identifier | ExFiles\Box 123\4\ scan0009 | |
| Date | 1st July 1930 | |
| X180 To Hs.{Lord Ernest Hives - Chair} from Sg.{Arthur F. Sidgreaves - MD} Experimental Cars. Sg{Arthur F. Sidgreaves - MD}19/El.7.30 Copy to R.{Sir Henry Royce} Wor.{Arthur Wormald - General Works Manager} In the list of experimental cars, Hsl/EE.306.30 I see it says that 14-EX is being used in connection with development of silent (helical) three speed gear. Would you please let me know whether this is something different from the device we tried on a 20/25, and also give me general information in regard to this matter. I am becoming increasingly anxious in regard to this question of some satisfactory device to enable us to offer an easy change from third to top and vice versa. Referring further to the same memo. I notice that excluding 18-EX used by R.{Sir Henry Royce} you have 4 Phantom II cars now for general development purposes in addition to the left handed chassis, and should be glad to know if you are satisfied that you still really require as many cars as this. Sg.{Arthur F. Sidgreaves - MD} | ||