Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 314
d between the coreand the mounting strip is a U-shaped pole-piece, c, in which to pivot 292 AMERICAN TELEPHONE PRACTICE. the rotating armature, /. This armature normally hangs in theposition shown in the upper cut of Fig, 247, but when attracted bythe core of the magnet is drawn into the position…
Telephone
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