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 comparing materials from 'Brunton's Jupiter' and 'Shipman's' at 150 diameters magnification.
| Identifier | ExFiles\Box 17\6\ Scan277 | |
| Date | 13th April 1934 | |
| R.R. 403 (5m) (62316 13-4-34) J.H.,Ltd. ROLLS-ROYCE LTD. LABORATORY. PHOTOMICROGRAPH NO A1.101 MAGNIFICATION : 150 DIAMETERS. Brunton's "Jupiter". Shipman's. | ||