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).
Photograph of an engine cylinder head showing the combustion chambers and valve ports.
| Identifier | ExFiles\Box 179\2\ img100 | |
| Date | 31th December 1931 guessed | |
| E36157 PL. 40 | ||