Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity (1905)
American School (Chicago, Ill.) · Chicago : American School of Correspondence · leaf 328
iagram, Fig, 24, in which theapparatus and connections for both terminals are shown. D IIand D It are the differential relays; the gap between them is sup-posed to be bridged by the main-line wire, which may be 450 or500 miles long. In addition to the relays and batteries, the essentials for… … OS o <H W f- H - J V W =^ ea g O 2 i w Sn I :W > U > CC >; THE ELECTRIC TELEGRAPH 69 iiiiine; the local circuits for the relays are not shown. One ])oleof each battery is trroiinded; the other makes contact with the ])OstP of the transmitter; and, as the sets are duplicates, one only…
Electrical engineering
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