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).
Brief report on the status and specifications of an experimental 20 HP dynamo.
| Identifier | ExFiles\Box 165\6\ img212 | |
| Date | 12th October 1929 | |
| X5661. 12.10.29. The only experimental 20 HP. dynamo on an engine is M in No.5 test house where it is not being run very much. It is an H.O. machine (28 slot 3 turn coils) RJA. | ||