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).
Technical description of the switchbox, its connections, and the electrical system's potential.
| Identifier | ExFiles\Box 26\2\ Scan039 | |
| Date | 6th October 1919 | |
| Contd. -4- EFC2/T6.10.19. The inside of the switchbox may be inspected by removing the front cover. The charging switch consists of a four point switch, that is to say, a switch which makes contact between four points simultaneously, three of these points on the switch are connected in the box to the terminals to which the field, control and negative leads from the dynamo are respectively connected, the fourth point passes onwards through the series coil of the cut-out to the fixed contact of the main cut-out. It may as well be stated here on this particular electrical system, all the switching, with one exception to be referred to later, is done on the negative side, and that, therefore, the negative side of the system must be looked upon as the high potential side, and the positive side as the return side, being connected to the frame for ignition purposes and therefore at frame potential. CONNECTIONS OF SWITCHBOX. See photostat herewith Contd. | ||