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).
Micrograph showing a crack in a material, highlighted with a red annotation.
| Identifier | ExFiles\Box 136\1\ scan0260 | |
| Date | 25th November 1937 guessed | |
| Crack | ||