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).
Recommendation to continue using a valve design modified to 45° angle seats, with a note on sending samples.
| Identifier | ExFiles\Box 48\4\ Scan196 | |
| Date | 1st September 1923 | |
| contd:- -3- Hs {Lord Ernest Hives - Chair} 1/LG1.9.23. Our recommendation is that we continue to use the present design of Valve modified to 45° angle seats. Scheme of proposed modification attached. We are sending a sample of umbrella and flat headvalves to WW. Hs. {Lord Ernest Hives - Chair} | ||