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).
Magnified photograph (X10) of a metal component showing surface detail and wear.
| Identifier | ExFiles\Box 94\2\ scan0213 | |
| Date | 11th August 1936 guessed | |
| LABORATORY A1619. X10 M/3124 | ||