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).
Technical note on the interchangeability of a modified head.
| Identifier | ExFiles\Box 8\6\ 06-page04 | |
| Date | 8th July 1937 guessed | |
| (sheet 2) With these modifications the head is still interchangeable with the present type. E.{Mr Elliott - Chief Engineer} | ||