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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 350

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 350
ther side of the equator, at every latitude from the RATIO OF DIP TO LATITUDE. 293 beginning of the first degree even to the goth, it dips; yet,not in ratio to the number of degrees or the arc of the latitudedoes the magnetic needle dip so many degrees or over a likearc; but over a very different… … passes round the earth, or an earthkin or terrella, from theequinoctial circle G toward B (the pole), rotates on its centre,and, midway in its progress from the equator to pole B^ pointsto the equator F as the mean of the two poles: thereforeought the versorium to rotate much more quickly than…

Magnetism

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