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)
tificial magnets are producednot only by touch or friction from otliermagnets; but hy induction ; and bye/ec-trical currents. The method by touch is accomplishedby various modes of manipalation, of which only two or three will bedescribed. 612. Figure 40.—Method of charging horse-shoe mag-nets.—Let…
Physics · Astronomy
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