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).
Response regarding the control brush position specification for a 20/25 Dynamo.
| Identifier | ExFiles\Box 62\3\ scan0195 | |
| Date | 2nd February 1931 | |
| X5661 By/RD. from EFC. EFC3/ADL 2.2.31. X.5661. 20/25 DYNAMO. Answering your By/RD18/N10.2.31, there is no reason for any alteration in the control brush position of the present 56 coil machine from that already given and specified in the current specification of production test. EFC. | ||