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 of a substance identified as 'Lepaz' at 100 diameters magnification.
| Identifier | ExFiles\Box 120\1\ scan0343 | |
| Date | 1st October 1935 | |
| R.R. 403 (10m) (92117-1-10-35) J.H., Ltd. ROLLS-ROYCE LTD. LABORATORY. PHOTOMICROGRAPH No. A1392 MAGNIFICATION: 100 DIAMETERS. "Lepaz". M1126 | ||