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).
Extract regarding a proposal to experiment with Mackenzie's change speed fan drive.
| Identifier | ExFiles\Box 135\1\ scan0005 | |
| Date | 14th February 1924 | |
| X.1509 P/W. Hs.{Lord Ernest Hives - Chair} X.1509 X.433. Wa{Mr Wallis}5/Go.14.2.24. Extract -- Many thanks for your memo. Hs{Lord Ernest Hives - Chair}1/LG9.2.24. I am much obliged to you for your proposal to experiment with Mackenzie's change speed fan drive. -------- WA.{Mr Wallis} | ||