American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 312
n two,as at p, p, and a resistance coil of 130 ohms is placed between the segments, as sliown. L, in Fig. 202, is a leg wedge. It has but one live face, that is, one metalface, the other side being insulated. The live face cuts out the 130 ohms when thewedge is inserted in the jack, as at p. LOOP… … FIG. 202 a. A ^ i ^^7: \FF DAVIS LOOP SWITCH. in the case of the apparatus at a, Fig. 202, the circuit has an added resistance of 160olims from d, while,in the case of the ai)paratus at b, the circuit lias an added resistanceof 30 ohms, and also the resistance of a loop leg which is inserted by…
Telegraph
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