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).
Note referencing previous correspondence on the mushroom type rotor.
| Identifier | ExFiles\Box 61b\2\ scan0095 | |
| Date | 7th September 1928 | |
| X.8690 7.9.28. For correspondence re mushroom type rotor previous to being standardised see X.4041. EFC. | ||