A dictionary of electrical words, terms and phrases (1898)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W. J. Johnston company · leaf 23
^i,ff,,.v:,;.,:.,v.:» Fig. Q. Water-Level Alarm … Fig. 10. When arranged with a double float, as shownin Fig. 10, the alarm may be made to signaleither a too high or a too low water level. Alarm, Yale-Lock-Switch Burglar —An apparatus whereby the opening of adoor by an authorized party provided with theregular key will not sound an alarm, but…
Electricity · Electrical engineering
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