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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 281

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 281
may come into closercontact—not in order that the corporeal matter of the stonemay be joined to the stone and stick to it, but the two areslightly worn away by the friction, and (useless parts beingground off) are united closely: hence arises in the excited irona grander force. In the figure, A… … toward it; so, too, C is only a passable mode, the point beingturned away from the pole ; Z> is a worse mode on account ofthe greater distance from the pole ; i^ is a bad mode becauseit lies on a parallel across the stone ; the magnetic needle L ROTARY NEEDLES AND THEIR ADVANTAGES. 225 that is…

Magnetism

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