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 264
nical circuit maintainer. The details and operation of thisbell are clearly described under the figure and the operation of the con-trolling device is progressively shown in figs. 3,218 to 3,220. Buzzers.—A buzzer may be defined as an electric call signalwhich makes a buzzing noise caused by the… … ONE COIL MAGNET HOLLOW I RON CORE ARMATURE ELECTRO-MECHANICALCIRCUIT MAINTAINER CL05ED POSITION PEN OR SET POSITION^CIRCUIT MAINTAINER LEVER MANUAL CONTROL CORD *IG. 3,217.—Elementary continuous ringing bell with electro-mechanical circuit maintainer.The electrical part of the circuit maintainer…
Electrical engineering
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