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).
Faint pencil sketch of a mechanical component, possibly a valve, with numbered callouts.
| Identifier | ExFiles\Box 4\7\ 07-page25 | |
| Date | 24th July 1912 guessed | |
| 1/4 MAX 1 2 3 4 5 1 2 | ||