Hand-drawn sketch of a lever and cam mechanism.
| Identifier | ExFiles\Box 42\4\ Scan094 | |
| Date | 5th August 1920 guessed | |
| Illegible | ||
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).