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).
Instructions for charging a battery from an external power source.
| Identifier | ExFiles\Box 26\2\ Scan195 | |
| Date | 19th February 1920 | |
| -13- Contd. CHARGING FROM EXTERNAL SOURCE. (1) Direct current is necessary. If the supply be alternating, suitable rectifying apparatus must be used. The charging current must necessarily be supplied through a suitable switch and a variable resistance or set of lamps, preferably carbon filament, suitably arranged to act as a variable resistance. (2) If the source of current be a direct current public supply main, then, before connecting up the battery for charging purposes it should be confirmed that the resistance is in the main showing the higher potential to earth. For this purpose take a lamp of supply main voltage, earth one terminal to water pipes or gas pipes and connect the other terminal in turn to each charging terminal. Then, with the minimum possible resistance in circuit, the lamp should light more brightly on that terminal supplied through the resistance. Otherwise the mains feeding the board require interchanging. In the absence of the necessary experience, an electrical expert should be consulted. It is possible to charge the battery in position on the car, making use of a plug, as previously described, supplied by Messrs. Lucas to fit the socket on the switchbox. This plug can only be inserted one way round. The connections of the other end of the flexible wire to which the plug is attached, to the charging board terminals, must be made in such a way as to cause the chassis ammeter to indicate "charge" when Contd. | ||