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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 296

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 296
h not decayed nor spoilt, attracts out VARIATION IS DUE TO EARTHS ELEVATIONS. 239 of the true direction, its whole mass operating. The figureshows a terrella with uneven surface. The demonstration is*made with small bars or short needles placed on the terrella :they turn from the terrella toward… … ate from the straight track, i.e., from the true meridian. Thetip of the versorium A does not point toward the pole P ifthere be a large projection B on the terrella ; so, too, thepoint C varies from the pole because of the projection F.Midway between the two eminences, the needle G points tothe…

Magnetism

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