Wright, Mark R., 1854- · London : Longmans · leaf 159
ISO Magnetism coincide with the axis of the earth, but makes an angle with it;we must call the end near the north pole a S-seeking pole, see-ing that it attracts the N-seeking pole of a needle. In fig. 143E Q represents the geographical equator, and e q roughly theposition of the magnetic equator.… … Fig. 145, Terrestrial Magnetism t^l a card, divided as in fig. 144 ; the whole is encased in a box.The box is turned until the line ns makes an angle of i8i°(or whatever the angle of declination may be) to the east with thedirection of the magnetic needle compass ; the points on therose are now…
Physics
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