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 28
ted 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-tromagnet may be used (see Fig. 11.) In this case the cur-rent is passed through one spool in one direction, and thenthrough the… … Fig. 11.—Magnetisation l»y 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 artificial magnets in paragraphs 2 and 11 are…
Electricity · Magnetism
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