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).
Standardisation table for motors and dynamos, specifying the use of solid poles versus punched plates.
| Identifier | ExFiles\Box 165\6\ img148 | |
| Date | 27th May 1927 | |
| X 5660 27.5.27. STANDARDISATION TABLE. | | Solid poles. | Punched plates. | |---|---|---| | 40/50 HP. motor. | No. | No. (45) | | " dynamo. | Yes. | No (29) or (28) | | 20 HP. motor. | Yes. | No. (29) | | " dynamo. | Yes. | No (29) or (28) | | Sequence motor. | Yes. | No. (41) | EFC. | ||