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).
Photomicrograph showing a magnified view of a material sample.
| Identifier | ExFiles\Box 49\2\ Scan081 | |
| Date | 31th December 1920 | |
| R.R. 403 [5 H] (S H 839, 31-12-20) G 2964 ROLLS-ROYCE LTD. LABORATORY. PHOTOMICROGRAPH No. A175 MAGNIFICATION : 50 DIAMETERS. | ||