But suppose that the earth is to the North of the magneticequator of the field, what happens then?
2
Thus the difference, arising from a change of place in the compass, appeared to diminish sensibly as we approached the magneticequator.
3
The terrestrial magnetic poles do not coincide with the geographical ones; nor does the earth's magneticequator quite coincide with the geographical equator.
4
At the magneticequator there is no dip at all, because the needle being equally distant from the north and south magnetic poles, remains horizontal.