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 293
egard the pole straight, for they areplaced in the middle of the sound and strong part of the ter-rella at a distance from the decayed part: the surface that is Ath. Kircheri, Magnes ; sive de arte magnetica, 1643, Lib. II, Pars. V, page410. 236 WILLIAM GILBERT. dotted and that is marked with… … parts. And as this is shown on a terrella whose surface hassensible imperfections, so, too, in terrellas that are whole andperfect, for often one part of a stone is of greater strength onthe outside than another, though no difference is plain tosense. With such a terrella variation is demonstrated…
Magnetism
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