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).
Instructions regarding the testing and performance of modified commutator brushes for Goshawk dynamos.
| Identifier | WestWitteringFiles\K\November1923\ Scan37 | |
| Date | 13th November 1923 | |
| RR 238 (300 Bks.) (SF 152. 6-11-18.) MP 197880 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: EFC Order No: A B 92. Customer's No.: 1 Modified Commutation of Goshawk Dynamos. A set of Z brushes has been run for the equivalent of 2500 miles continuously, and for 50 hours intermittently, first in the old standard condition & then with the commutator undercut by the new process & the tops of the brushes bevelled in the up-to-date way; the object being to compare performance & wear. In the first run, sparking was moderate & the positive brush became irregularly polished. The negative & central brushes were polished in the usual way. The commutator was slightly burnt. (contd) Signed This Sheet must be filed on completion of the work. | ||