Modern practice of the electric telegraph. A handbook for electricians and operators (1872)
Pope, Frank L. (Franklin Leonard), 1840-1895 · New York : D. Van Nostrand · leaf 95
Connect one end of the loop to the + pole of thebattery E, and the other to one of the galvanometerwires at M. Connect also the + pole of the batterywith the resistance coils, R, at N, and the — pole ofthe battery to the key, K, and common terminal, a, ofthe galvanometer. Connect the remaining… … Having ascertained the resistance of the loop, ar-range the connections as shown in Fig. 52. Upon depressing the key, K, the battery current will TESTING TELEGRAPH LINES. ] flow through M and R, and also through the loop. Theresistance required at R to balance the needle will beequal to the sum of…
Telegraph
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