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 detailing observations on commutator brush wear and discolouration after two test runs.
| Identifier | WestWitteringFiles\K\November1923\ Scan38 | |
| Date | 6th November 1918 | |
| RR 238 (300 Bks.) (SF 152. 6-11-18.) MP 197880 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To Order No Customer's No. Z + 19 at the trailing edges of the segments & was somewhat irregular in its discolouration. The brush wear was, Positive .022", Negative .023" Control .0195". In the second run, sparking seemed little changed, but the positive brush acquired a better polish than before, while the commutator was not burnt at the edges of the segments, & was of a uniform light brown discolouration. The wear in this case was, Positive .0075" Negative .0215" Control .0235" In both tests, the springs were of standard pressure. Signed H Allen This Sheet must be filed on completion of the work. | ||