Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 201
makes contact with the tip of theline spring and at the same time forces it out of engagement withthe pin, p. Normally, therefore, the line wire is connected to theground through the wire, /, spring, c, pin, p, wire, g, and line-dropto the ground connection. When the plug is inserted in the… … FIG. 157.—SWITCH. BOARD DROP. pose of the drop is to attract the attention of the operator wheneverany subscriber wishes a connection. The coil of the electromagnetis mounted on the back of the front plate, c, of the switch-board, asshown. To the armature, a, pivoted at its upper end, is attached…
Telephone
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