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 photomicrograph showing a material's structure at 50 diameters magnification.
| Identifier | ExFiles\Box 49\2\ Scan082 | |
| Date | 31th December 1920 | |
| R R 403 [5 H] [S H 839, 31-12-20] G 2964 ROLLS-ROYCE LTD. LABORATORY. PHOTOMICROGRAPH No. A176 MAGNIFICATION: 50 DIAMETERS. | ||