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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 331

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 331
n of a great mass of land.At C there is no variation caused by B, which is too distant;at D the variation is greatest, because there the needle is at-tracted or is made by the whole earth to turn to the projectingland B ; nor is the needle hindered, nor checked, nor led tow?-d 274 WILLIAM GILBERT.… … But, now, from C to D the variation grows, yet theversorium does not deviate so quickly in the first stages asit does when near D. But you sail more miles on the parallelcircle CD as long as you are near C, to register one degree ofvariation, than you sail when near D; so, too, in travelling fromD…

Magnetism

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