William Gilbert of Colchester, physician of London, On the loadstone and magnetic bodies and on the great magnet the earth. A new physiology, demonstrated with many arguments and experiments .. (1893)
Gilbert, William, 1544-1603, Mottelay, Paul Fleury, b. 1841, tr, Wright, Edward, 1558?-1615 · New York, J. Wiley & sons · leaf 242
rthenglobe suppose there are various earths and mixtures that ina manner separate the mine from the true globe of the earth. DIRECTIVE FORCE. 18$ It is therefore informated by the earths forces just as CD,a mass of iron, is in air; hence the extremity B of the mine orof any part thereof moves… … mixed earthy matter, the case is different. For if the partEF, being taken out, were to be floated, it is not E that wouldturn to the north pole, but F. Thus, in those bodies whichacquire verticity in the air, C is the south extremity and is at-tracted by the north pole G. In those which come into…
Magnetism
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