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 337
t is one in which a magnetized armature ismoved from point to point under the influence of magnetic poleschanging as the effect of changes in the direction of the currentaround the cores. One step more and we have a differential polar relay. In thediagram, Fig. 20 is an extra wire with a number of… … ^—^—^^ Fig. 26. clockwise, then anti-clockwise around the cores; and from whathas been said it is plain that if currents of equal strength flow inthe wires C Z and C Z they will induce at A and B magnetic polessuch that they will neutralize each other; j)rovided, of course, thereis the same number…
Electrical engineering
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