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 284
mustbe rubbed on the south pole of the terrella turned toward theearth; so excited, it will incline to the south. In southernlatitudes, below the equator, the case is different, and the causeof the difference is given in Book II, Chap. 34, where is shown(by means of a combination of earth and… … acquires no property. A, B are two loadstones conjoined nat-urally at their opposite ends ; C, the point of a versorium,touched simultaneously by both, is not excited, if the load-stones be equal (though the loadstones are connected with itin the natural way); but if the loadstones be unequal,…
Magnetism
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