Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 28
ay be sub-stituted for the permanent steel magnets used in the previousmethods for making a magnet, or two bar electromagnetsconnected by a piece of soft iron forming a horseshoe elec-tiomagnet may be used (see Fig. 11.) In this ease the cur-rent is passed through one spool in one direction, and… … Fig. 11.—Magnetisation by an Electromagnet. beginning at its middle point and following the direction ofthe dotted lines in Fig. 11, stroke on all sides, and then strokethe other half of the bar on the other pole..16. Making Permanent Steel Magnets.—The artificialmagnets in paragraphs 2 and 11 are…
Electricity · Magnetism
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