Photograph of a large, circular, riveted mechanical component, likely a flywheel or clutch drum.
| Identifier | ExFiles\Box 83\2\ scan0361 | |
| Date | 8th January 1940 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).