American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 108
of the strain from the SWITCH BOARDS. 79 flexible conductors a piece of stiff rubber tubing r, is placed over portions of the in-sulated handle i of the wedge and the conductor. The wedge proper is about 4 incheslong, I inch wide and | inch thick. ■ Referring again to Fig. 58, s, s, etc., represent… … J is a spring-jack, connected by office wire, (that is, a pliable, insulated wire)at p, to the strap 2. j is also a spring-jack. The jack is hinged as shown, and iscapable of being moved, as at w, to permit the insertion of one or more wedges. Atthe end of the double conductor cord, remote from the…
Telegraph
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