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).
Three photographs showing the microscopic structure of a braking surface.
| Identifier | ExFiles\Box 120\1\ scan0323 | |
| Date | 14th January 1936 guessed | |
| PHOTOGRAPHS REPRESENT THE BRAKING SURFACE. | ||