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 a set of Wraith III push rods with a new diameter of .312.
| Identifier | ExFiles\Box 10\3\ 03-page043 | |
| Date | 12th July 1937 | |
| To HPS.{Horace Percy Smith - Experimental Factory Mgr} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} 654 Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}16/AP.12.7.37 WRAITH III. Will you please instruct for a set of Wraith push rods to be made .312 dia. otherwise as Ex.27961 which are .250 dia. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||