Merchant, F. W. (Francis Walter), 1855-1937, Fessenden, Cortez, b. 1852 · Toronto : Copp, Clark · leaf 324
. 256 showsthe construction of one of the most common forms.It consists of an electro-magnet E, in front of the polesof which is supported an armature A by a spring S. Atthe end of the armature is attached a hammer H, placedin such a position that it will strike a bell B when thearmature is drawn… … Fio. 256. 316 PHYSICAL SCIENCK. Wlien the circuit is completed by a push-button P,the current from the battery passes from the screw Cto spring D, through the electro-magnet and back tothe battery. The armature is drawn in and the bell isstruck by the hammer; but by the movement of thearmature, the…
Physics
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