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 168
taneous operation; also circular retardation coils areused. Fig. 3,098 shows a simple diagram of the circuits. In practicethere are two circuits used called the physical and the phantom; theformer being the circuit proper and the latter an arrangement by whichthree circuits may be obtained from two… … Fig. 3,099.—Diagram of elementary fire alarm circuit. Fire alarm apparatus forms that ele-ment of the system depended upon to announce to the fire righting force the existence ofand location of a fire. The equipment consists of gongs and indicators located in the firedepartment houses, and where…
Electrical engineering
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