Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 663
unk and thus flash the line lamp to attract the attention ofthe A operator. After this he may converse with the operator by thetalking set of Fig. 471. In Fig. 472 is shown the test circuit by means of which the wirechief is enabled to perform all the necessary tests to ascertain con-ditions of any… … FIG. 471.—WIRE CHIEFS TELEPHONE CIRCUIT. a line undergoing test with respect to the testing apparatus, as willbe described. A grounding key, 3, to ground one side of the line under test. Bymeans of this and the reversing key the two sides of the line maybe alternately grounded. A volt-meter key, 4,…
Telephone
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