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).
Brief internal memo inquiring about the status of Mackenzie's change speed fan.
| Identifier | ExFiles\Box 135\1\ scan0009 | |
| Date | 27th December 1923 | |
| X1509 P/W Hs{Lord Ernest Hives - Chair} Wa.{Mr Wallis}6/Go.27.12.23 Dear Hives, What have you done with Mackenzie's change speed fan ? Please let me know. WA.{Mr Wallis} Cahy | ||