Electric Bell

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An illustration of an electric bell. “The magnetizing coils are a a, and they are connected with their terminals at binding posts b1, b2. When these binding posts are connected with the electric current and the circuit is closed, the armature, at d, will be attracted, and will push the hammer e upon the bell. When the armature is attracted, the spring f leaves the screw contact g, against which it rests.” -Foster, 1921


Ellsworth D. Foster ed. The American Educator (vol. 3) (Chicago, IL: Ralph Durham Company, 1921)


TIFF (full resolution)

1792×2400, 701.9 KiB

Large GIF

764×1024, 119.6 KiB

Medium GIF

477×640, 61.7 KiB

Small GIF

238×320, 20.3 KiB