American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 369
WHEATSTONE REPEATER RELAV. 3i6 AMERICAN TELEGRAPHY. shown inserted in the center, the sets may be speedily disconnected from theground. WR and EE, Fig. 234, are the Wheatstone repeater relays. FIG. 237. … DIAL RHEOSTAT. The routes of the circuits, when arranged for working through, may be read-ily traced by the small figures i-|-; 1—; 2-f-, 2—; etc., from the main battery posts,up to the split, or fork, that is the junction of the main and artificial wires, whencethe circuits may be further traced…
Telegraph
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