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).
The performance and wear of 'AG.2 Morganite Brushes'.
| Identifier | ExFiles\Box 172\2\ img021 | |
| Date | 22th October 1923 | |
| Extract from EFC6/T22.10.23. AG.2 MORGANITE BRUSHES. This set ran more smoothly and the positive brush is polished over the leading three-quarters of its surface. The control brush, which sparked more than is usual, is duller. The commutator was left brown with slight irregularities. The wear is :- Positive .014" - Negative .017" - Control .042". | ||