A dictionary of electrical words, terms and phrases (1898)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W. J. Johnston company · leaf 508
Fig. 519. Automatic Switch. the lamps to be lighted, to the contacts betweenthem. The push buttons, P1 and P2, are con-nected by their wires to the main M1 and thebranch B1. These buttons are made respectively positiveand negative, and are marked -j- and —. Thethird wire of the push button is… … Fig. J20. Automatic Switch.. lished between the magnet and the lamp L, inseries. This is for the purpose of cutting downthe circuit to the ^ of an ampere, and thus per-mitting a thin wire to serve between the buttonand the switch magnet. When the button, P2, is closed the lamps areturned out.…
Electricity · Electrical engineering
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