Photograph of a piston crown showing its surface condition.
| Identifier | ExFiles\Box 179\2\ img146 | |
| Date | 8th January 1932 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).