Photograph of a six-cylinder, four-valve-per-cylinder engine cylinder head on a stand.
| Identifier | ExFiles\Box 54\4\ Scan092 | |
| Date | 19th July 1933 guessed | |
| ", | ||
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).