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).
Continued note on the conventions for representing current direction on wiring diagrams.
| Identifier | WestWitteringFiles\S\September1928-October1928\ Scan084 | |
| Date | 25th September 1928 guessed | |
| -2- Contd. preferable to leave out arrow heads on the main battery charge and discharge wire from battery, via main fuse and ammeter, to distribution board so that the only arrow heads on the diagram refer to load and generating currents which are always in the same direction. (5) One other small point of current direction is that you indicate the magneto earthing current by arrow heads pointing in one direction. This, however, will be an alternating current and we consider it should be indicated by a crossover or double arrow head facing both ways. EFC. | ||