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).
Laboratory report with two photomicrographs showing material features at x60 magnification.
| Identifier | ExFiles\Box 95\2\ scan0214 | |
| Date | 21th June 1937 guessed | |
| M1,347/1 x60 M1,347/2 x60 LABORATORY | ||