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 320
there is an extramagnet with a pendent, or hanging armature marked P in one andP in the other. Each one is so placed that, when released from itsmagnet, the tension of a spring forces it against the upright arma-ture and holds the local points closed. To aid the student intracing out the different… … 292 THE ELECTRIC TELEGRAPH as are supposed to extend in each direction to terminals, it may be,400 miles distant. When the circuits are at rest, the armaturesof the instruments are attracted by their respective cores, and aresaid to be closed. Recall now the definition of a repeater, and notice in…
Electrical engineering
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
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