Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
MAGNETISM. 329 Artificial magnets are more powerful and useful than the lodestoneor natural magnet, and possess properties identical with it. Tem-porary magnets do not retain their magnetism after the exciting causeis removed. Fig. 36. … 604. Figure 36.—Method of making an artificial mag-net with lodestone.—ME represents a part of the moiaited natural magnet (602), S and N being its poles. To impart the magnetism to the tempered barof steel, A, and render it a permanent magnet,place it upon the poles, as shown in the figure,and…
Physics · Astronomy
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