Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 210
s of wire to providesufficient exciting power to drive the lines of force throughthe air. To obtain a gentle pull over a long range, asolenoid or long tubular coil and a long movable core is used,as in Figs. 175, 177, and Xo. 6 and 11 of Fig. 181. Fornearly all purposes the iron parts, including… … Fig. 183.—Electromagnet withthe Oil on the Yoke.
Electricity · Magnetism
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