Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 318
or drop, snowing the way in which a raised window will closethe circuit. As many open switches as desired may be connected to any of the circuitsso long as they are all in parallel. ELECTRIC BELLS 2,409 baseboards or in metal moulding. The latter cannot bemolested without making some noise and is… … Pigs. 3,317 and 3,318.—Jupiter fire alarm box closed and open with glass broken and alarmgoing in. In operation when glass is broken the mechanism acts automatically, sendingin the number of the box four times. Once starting, the alarm cannot be interfered with.By means of a special key the circuit…
Electrical engineering
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