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).
Description of the connections for the motor, main switch, actuator box, and push-button switch circuits.
| Identifier | ExFiles\Box 26\2\ Scan049 | |
| Date | 16th October 1919 | |
| Contd. -14- ERC2/16.10.19. the needle moves, whether the supply is greater than the demand, or vice versa. Using a central zero ammeter, connected in this manner, really tells us more about what is going on in the various circuits than using a single range ammeter merely connected in the dynamo main circuit. (f)(g)(h)(i) Connections of Motor, Main switch, Actuator Box and Push Button Switch. Suitable heavy current leads are run from the battery round the third cross member to the motor, the one from the negative terminal of the battery goes direct to the motor but the lead from the positive terminal passes the motor and goes on to the electrically operated main switch on the left hand side of the front of the dash. The circuit is completed by a portion of heavy current cable running from the main switch to the motor. The main switch has three terminals, one in connection with the starter motor by cable just mentioned, one a small terminal in connection with the push button switch, and a third which is common to both main curcuit and operating or relay circuit, which is in direct connection with the positive end of the battery, as already described. Current for operating the relay circuit is taken from the negative side of the Lucas junction box and passes through the push button switch, it then divides into two portions one of which passes through the exciting coil of the main switch and returns to the battery along the heavy current positive lead, Contd. | ||