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).
Request to ascertain the attractive force between an armature and pole piece of a dynamo and motor for given surface densities.
| Identifier | WestWitteringFiles\G\October1921\ Scan55 | |
| Date | 12th October 1921 | |
| To EFC. from R.{Sir Henry Royce} Copy to Cd. [text struck through] R3/G11/10/21. X.294. RE DYNAMOS. X 2713 Kindly ascertain for me the attractive force between an armature and the pole piece of a dynamo and motor per square c.m. of surface for various densities about what we naturally use, namely B = 5,000 to 7,500 lines per square c.m. R.{Sir Henry Royce} [STAMP] FC OCT 12 RECEIVED | ||