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).
Test reports for alternative brushes on 20 HP dynamos and the viability of further testing.
| Identifier | ExFiles\Box 50\5\ Scan386 | |
| Date | 1st November 1925 | |
| X4333 To FJA. from EFC. EFC4/T6.11.25. X.4333. BRUSH & COMM. TESTS on 20 HP. DYNAMOS. 57 Seg. Comm. with Le Carbone X Main and EG3399 Control Brushes. Attached are the various reports. (1) Do you consider that these show any possible advantage over the standard brushes ? (2) If so, do you consider it advisable to make up another machine with these brushes, for another 10,000 mile test? EFC. | ||