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 two surfaces, labelled B and A, at 3 diameters magnification.
| Identifier | ExFiles\Box 95\3\ scan0179 | |
| Date | 20th June 1935 | |
| R.R. 403 (5H) (84259 20-6-35) J.H., Ltd. ROLLS-ROYCE LTD. LABORATORY. PHOTOMICROGRAPH No. A/333 MAGNIFICATION : 3 DIAMETERS. B. A.{Mr Adams} | ||