Dynamo-electricity: its generation, application, transmission, storage and measurement (1884)
Prescott, George B. (George Bartlett), 1830-1894 · New York, D. Appleton · leaf 289
Fig. 145. lighting by incandescence. The current may be taken from thearc lamp circuit during the evening, while the arc lights arein operation, or in the day time while the lamps are cut out of 270 THE ELEGTRIO LIGHT, … Fig, 146. THE SWAN INCANDESCENT LAMP. 271 the circuit, or they may be placed in a special circuit audcharged by machines set apart for this use alone. The im-portant features of the system are: first, to provide an unfailingsupply of electrical energy, by the use of the storage batteries:
Electrical engineering
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