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).
Issues with secular variation of electrical output and the bedding of brushes.
| Identifier | ExFiles\Box 62\3\ scan0182 | |
| Date | 8th December 1924 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 461-8-12-24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. To.........................................................................19 Order No............................ Customer's No. 3 [Vertical text in left margin]: Secular variation of output [Main handwritten text]: immediately excited and ran up to a peak output identical with what it had been before. The backward running was done with the field connection made as for charging. With reference to the ability of machines to keep their original setting (electrically) after being sent out, we had trouble on this score in the early days as it was not realized how sensitive the output was to the exact bedding which the brushes, particularly the control brush, assumed in prolonged running. It was found that when the output was once set with the brushes properly bedded the control position came always very close to a particular angle and that thereafter the output did not undergo much change. Sometimes the trailing edge of one or more brushes (Cont'd) Signed ................................ This Sheet must be filed on completion of the work. | ||