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).
Instruction to manufacture two Wraith crankshafts from .4 carbon steel.
| Identifier | ExFiles\Box 8\5\ 05-page14 | |
| Date | 13th December 1937 | |
| HPS.{Horace Percy Smith - Experimental Factory Mgr} from Rm.{William Robotham - Chief Engineer} c. Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} J 617 Rm.{William Robotham - Chief Engineer}2/AP.13.12.37. WRAITH CRANKSHAFT Will you please put in hand forthwith, two Wraith crankshafts in .4 carbon steel. When the forgings are in the Factory, further instructions will be issued as to the sequence of machining operations and heat treatment necessary. Rm.{William Robotham - Chief Engineer} | ||