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)
a watch move, the N pole will be up-permost, as shown in the figure. If the wire iswound in the opposite direction, the S pole willbe uppermost. Magnets may be thus made with statical electricity. The explanation of this is, that each volute of the helix, carryingan electric current, is itself an… … 402 ELECTRICITY. 77S. Figure 56.—Electro-magnets are masses of soft ironwound with coils of insulated copper wire. They vary in form andFig. 56. size. The figure represents the form of those designed to sustain great weights.The spools, J and H, are virtually one ;the direction of the whorl is only…
Physics · Astronomy
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