Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 415
f the plug closes a pathfor current from the battery, B, over the sleeve of the cord circuitto the winding, 17, of relay T, winding, 18, ofrelay R to ground, thusactuating both relays, and rendering the line signals of both di-visions of the board inoperative, and also connecting the… … 333 394 AMERICAN TELEPHONE PRACTICE. cuit from the battery, B^, through the resistance, 19, to the sleeveconductor of the jack. The operation of testing and of the supervisory signals, and, infact, of the cord circuit as a whole, is the same as in the single di-vision two-wire system of the Kellogg…
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