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 338
ons—the polar duplex—ispossible. The relay is made in different forms, but it consistsessentially of a permanent magnet in which is pivoted a strip ortube of soft iron called the armature. This is ])]aced bet\veen twocores around which are wound, in the manner shown in Fig. 26 307 78 THE ELECTRIC… … the wires may be laid side by side throughout the length of eachcore; or, as in the diagram, Fig. 27, in equal compartments se])a-rated by discs at right angles to the core. In the relays most com-monly used each division of a spool contains 2,400 turns of wire,and has a resistance of 200 ohms; so…
Electrical engineering
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