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 Z brushes and an annealed commutator after a bench run.
| Identifier | ExFiles\Box 50\5\ Scan356 | |
| Date | 18th February 1925 | |
| RR 230 (100 BKS.) (SH57. 28-8-20.) MP 224358 X4333 ROLLS-ROYCE LTD. INSTRUCTIONS. To: E.F.C. Order No.: A.E. 42. Customer's No.: X. 4-333. 18-Feb. 1925. Z Brushes with Annealed Commrs. A set of Z brushes on Lancashire as above has now completed a bench run. The positive is most well polished except at the leading edge; the remainder is smooth or blackened in varying amounts in bands parallel to the commutator segments. The negative & control brushes are both fairly smooth, but slightly duller on the trailing sides. The commutator is polished and almost uniform in colour (a light brown). The brush wear is:- Positive .0045", Negative .003", Control .0045" which is a very good result. Signed: JFA This Sheet must be filed on completion of the work. | ||