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).
Continuation page discussing potential sparking from brushes at high speeds and a lubrication oil duct.
| Identifier | WestWitteringFiles\E\November1920\ Scan76 | |
| Date | 22th November 1920 guessed | |
| -2- Contd. remainder of the track, which at high speeds would cause sparking; but at the same time, so many small brushes may prove a source of trouble. For lubrication purposes an oil duct fitted with cap, is provided at each end. C.A.P. | ||