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).
Blueprint of a component showing dimensions and direction of flux.
| Identifier | ExFiles\Box 165\3\ img110 | |
| Date | 9th April 1935 guessed | |
| DIRECTION OF FLUX, .750 CTRS., 1.600, +.25, A, EL 120. | ||