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).
Blueprint drawing of a piston showing a full view and a cross-section view.
| Identifier | ExFiles\Box 170\1\ img059 | |
| Date | 18th January 1939 guessed | |
| MACHINE WHERE MARKED "F" GENERAL DRAW ON STAMPING 1 1/2° A B | ||