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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 82

An illustration from 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, leaf 82
25. QUALITIES OF THE LOADSTONE. 25 On top of the stone AB is set the versorium in such away that its pointer may remain in equihbrium : mark withchalk the direction of the pointer when at rest. Then movethe instrument to another spot and again mark the directionin which the pointer looks; repeat… … the stone, for it eagerly faces the stone at right angles, andseeks the pole itself direct and turns on its axis in a rightline toward the centre of the stone. Thus the pointer D*regards A and F, the pole and the centre, but the pointer Elooks not straight either toward the pole A or the centre F.A…

Magnetism

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