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).
Instructions for machining newly forged Wraith III inlet valves from The Belgrave Engineering Co.
| Identifier | ExFiles\Box 10\3\ 03-page121 | |
| Date | 10th March 1938 | |
| 654. To HPS.{Horace Percy Smith - Experimental Factory Mgr} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. Wym.{G. Harold Whyman - Experimental Manager} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}1/AP.10.3.38 WRAITH III. INLET VALVES. We now have 6 valves which have been forged almost to size by The Belgrave Engineering Co., and which represent an appreciable saving on our present method. Will you please machine 3 all over as standard in accordance with the drawing EW.1429 and the remaining 3 machined on the stem and the seat but not on the top and bottom sides of the valve heads. Etched sections from previous samples reveal the flow lines to be good and before we decide to fit in an engine we would like you to inspect the surfaces of the ones that have been machined all over to see that they are O.K. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} will supply the valves and everything being O.K. will allot a unit for their fitment. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||