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)
to meas-ure it at different places, a needle is somounted as to be perfectly free tomove or rotate in a vertical plane; theamount of dip being indicated by agraduated circle or quadrant, as repre-sented in the figure. At any place, thedip will be greatest possible when theneedle vibrates in the… … MAGNETISM. 345 643. Figure 60.—Position of the dipping-needle indifferent 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…
Physics · Astronomy
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