22 POPULAR LECTURES AND ADDRESSES. 



a north magnetic pole and a south magnetic 

 pole. The north magnetic direction in any one 

 of them is that which leads you to the north 

 magnetic pole. You see that in the northern 



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I-'IG. 5. Magnetic Chart: Northern Hemisphere. 



polar region, between the true north pole and 

 the magnetic north pole, the north magnetic 

 direction leads obliquely, or directly, southward ; 

 and, again, in the region between the true south 



