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
e E. In operation, when thecurrent flows through the coils of the electromagnet, the armature E turns on its pivottowards the magnet core A, thereby releasing the arm D, which in falling rotates thearrow to the position shown in dotted lines. The arrow is reset by pressing a button,which raises the… … Fig. 3,282.—Automatic annunciator, especially suitable for residence service; it serves thepurpose of two bells, one at the front door, and one at the back door. It can be readlyconverted into a three point annunciator by the addition of the buzzer Z, as shown, whichcan be operated from the dining…
Electrical engineering
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