Dynamo-electricity: its generation, application, transmission, storage and measurement (1884)
Prescott, George B. (George Bartlett), 1830-1894 · New York, D. Appleton · leaf 535
Fig. 315. … Fig. 316. Fig. 317. THE WESTON ARC LAMP. 515 of which, at the bottom, is a projecting knob, and at the right aprojecting lever. Above is a small window through which ap-pears either the word on or the word off, according to the posi-tion of the electrical connections within the box. The…
Electrical engineering
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