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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 343

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 343
horizontal by reason of their turning poleward ; at the polesthey tend straight to the centre. But bits of iron will notstand up aright, save on a good loadstone, if they be too long. CHAPTER III. AN INSTRUMENT FOR SHOWING BY THE ACTION OF A LOAD- *STONE THE DEGREE OF DIP BELOW THE HORIZON INANY… … INSTRUMENT FOR SHOWING DEGREE OF DIP. 28/ decay or corrosion, of proper size, so that its diameter shall besix or seven finger-breadths. Having, by the method hereto-fore given, found the poles, mark them with some iron instru-ment, also mark the equinoctial circle. Next, in a squaredblock of wood,…

Magnetism

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