Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 382
calling supervisoryrelay, R, of the A operators cord circuit at the first exchange will notbe operated by the current flowing through it over the metallic circuitof the trunk line on account of the very high ressitance of the relay,A, at the incoming trunk position. As soon as the B operator… … J—WVv—CCD—(E3J^5 S/wvn^^^Unn^nJ vww^|i|i|i|ili[^y<wv| o z
Telephone
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