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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 337

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 337
meter,equidistant from the plane of the visible horizon, which is thetrue elevation of the earths pole), then inclination appears andthe needle dips in its meridian towards the body of the earth.Thus, let AB be the visible horizon of a region; CD theearths horizon, dividing the earth into equal… … to perpendicular just by its turning (to the north), as has alreadybeen shown, so now at G there is a sort of beginning of sucha turning, proportioned to the latitude (the magnetized bodydeparting from the plane of the horizon), and the needle inter-sects at unequal angles the horizon and shows dip…

Magnetism

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