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 252
ERTICITY. I95 earth, and O and P mutually attract, one being north, the othersouth. For if in the whole stone H was south and F northsthen in the divided stone P will be north with respect to H andO, south with respect to F\ so, too, i^and //tend toward con-nection if they be turned round a little,… … is attracted to A, until, being turned round, they form connec-tion and are held together. For this reason, iron bars placed *on parallels near the equator of a terrella whose poles are AB^do not combine and do not cohere firmly; but when placed
Magnetism
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