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).
Specification sheet detailing the magnetic flux densities for various components.
| Identifier | ExFiles\Box 62\1\ scan0087 | |
| Date | 14th November 1932 guessed | |
| -3- Flux Densities. Yoke 15,700 lines per sq. cm. Pole core 18,300 " " " Air gap 6,980 " " " Armature core 13,400 " " " Armature teeth 15,400 " " " Hs{Lord Ernest Hives - Chair}/Wst. | ||