Top-down photograph of an engine block's lower half, detailing the main bearing caps.
| Identifier | ExFiles\Box 132\3\ scan0023 | |
| Date | 11th June 1934 guessed | |
| 1 37 1 27 | ||
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).