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)
t parts of the earth.—SEN represents the magneticmeridian, and ME the magnetic equator of the earth. Let S, at oneextremity of the line SEN, represent the north magnetic pole, and N,at the other end of this line, the south magnetic pole; and the severalarrows, the dipping-needle, with the north… … that the needle assumes the horizontal position, being equally attractedby the two magnetic poles of the earth. At the magnetic poles the dip is 90°, the arrows being directed towardthe magnetic poles. When nearer the north pole than the south, thepoi7itf or N pole, of the needle, points to the…
Physics · Astronomy
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