Reverse of a photograph identifying a key plan for an engine.
| Identifier | ExFiles\Box 22\1\ Scan234 | |
| Date | 26th March 1925 guessed | |
| First of the Key plan of 80 P.S Water Engine - | ||
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).