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).
Two photomicrographs, No. A589 at 100x magnification and No. A590 at 1000x magnification.
| Identifier | ExFiles\Box 67a\2\ scan0125 | |
| Date | 29th March 1927 | |
| Card 1: RR 403 (2¼H) (DE 879 29-3-27) G3608 ROLLS-ROYCE LTD. LABORATORY. PHOTOMICROGRAPH No. A589 MAGNIFICATION: 100 DIAMETERS. Card 2: RR 403 (2¼H) (DE 879 29-3-27) G3608 ROLLS-ROYCE LTD. LABORATORY. PHOTOMICROGRAPH No. A590 MAGNIFICATION: 1000 DIAMETERS. | ||