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 laboratory photomicrographs, numbers A604 and A605, at 300 and 1000 diameters magnification respectively.
| Identifier | ExFiles\Box 154a\1\ scan0106 | |
| Date | 29th March 1927 | |
| RR 403 (2½H) (DE 879 29-3-27) G3608 ROLLS-ROYCE LTD. LABORATORY. PHOTOMICROGRAPH No. A604. MAGNIFICATION: 300 DIAMETERS. RR 403 (2½H) (DE 879 29-3-27) G3608 ROLLS-ROYCE LTD. LABORATORY. PHOTOMICROGRAPH No. A605. MAGNIFICATION: 1000 DIAMETERS. | ||