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 299
case. a vane of fluted silver glass or a numbered card. The vane orcard swings in front of an aperture in the indicator frame.When the electromagnet is magnetized, the armature is pulledsuddenly to one side and the pendulum then swings backwardand forward in front of the aperture for some time,… … Fig. 3,281.—Arrow or needle annunciator drop. In construction, the shaft A, passes through,and is free to turn in a hole or axially through the electromagnet core B. The arrowor needle C, is rigidly attached to the front end of the shaft A, near the face of the an-nunciator. The notched arm D, is…
Electrical engineering
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