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).
Request for the overhaul of a 40/50 dynamo bench-rig motor commutator due to sparking and black patches.
| Identifier | ExFiles\Box 60\1\ Scan120 | |
| Date | 27th July 1929 | |
| X 7660. RHC.{R. H. Coverley - Production Engineer} from EFC. EFC1/AD27.7.29. We should be pleased if you would arrange for the commutator of our 40/50 dynamo bench-rig motor to be skimmed up, the mica between the segments under-cut, and the brush-gear overhauled. The commutator has developed black patches as a result of the sparking due to irregularities on its surface and faulty spring control of the brushes, until now it is quite serious. In view of the dynamo work we have to do, we should like this done at your earliest convenience. EFC. | ||