Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 358
m in existence.Moreover, there is but one relay for each line, this relay serving notonly as a line relay, but also as a supervisory relay after a connec-tion has been made. In this the line relay has two active windings, which, however,are not differentially wound. One of these windings is… … FIG. 274.—CIRCUITS OF STERLING MULTIPLE SWITCH-BOARD. line, it is always under the control of the subscriber, the currentfor talking purposes being fed through the two windings of thisrelay to the line, this being the only connection at any time betweenthe line and the battery. When a subscriber…
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