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).
Various valve steel specifications and a design preference from drawing DES.749.
| Identifier | ExFiles\Box 56\2\ Scan045 | |
| Date | 5th December 1927 | |
| RG. {Mr Rowledge} from R. {Sir Henry Royce} c. to BJ. Wor. {Arthur Wormald - General Works Manager} c. to BY. {R.W. Bailey - Chief Engineer} Hs. {Lord Ernest Hives - Chair} X290 RL/M5.12.27. VALVE STEELS. X.1688 X.1474 X.290 X.4587 X.2993 Regarding DES.749 sent with your RG {Mr Rowledge} 6/LW2.12.27 E. {Mr Elliott - Chief Engineer} and I prefer fig.4. Cap with present standard when using softer valve steel. R. {Sir Henry Royce} | ||