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 175
joined together, had thesame force of turning to the pole, but, now being parted asunder, one will turnto the North, the other to the South, keeping the same posture and positionthey had in the Mine where they were bred: and the same happens in the leastbits that are seen in the greatest… … the whole force tends separately to the two poles along aninfinity of curves starting from every point of the equator thatdivides the sphere into two equal parts: from every pointof the superficies from the equator to the north on one side,and from the equator to the south on the other. Hence…
Magnetism
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