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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)

Johnson, Frank G., 1835- · Chicago, A.H. Andrews · leaf 404

An illustration from 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, leaf 404
tutes the discovery of the fundamental principle of electro-magnetism. 761. Figure 47.—Action of an electric current upon amagnet or needle.—If positive electricity flows from south to nortiiover a horizontal wire placed in the magnetic meridian, a needle wouldhave its north end deflected to the… … Fig. 48. the wire, the north end of the needle is raised. If the current passesfrom the north to the south, the movements of the needle are all reversed. By means of the rectangle sur- y\q.. 47. rounding the needle, in the figure,the current can be sent above, orbelow, or above and below,…

Physics · Astronomy

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