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).
Page fragment discussing the state of a counter-shaft under certain conditions.
| Identifier | ExFiles\Box 75\1\ scan0019 | |
| Date | 7th June 1912 guessed | |
| (6) serious, as of course the counter-shaft is free under these conditions. RR FORM NO. (D) 527. C & S LTD (D) 3920 | ||