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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 295

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 295
their extremities D, and C, let pieces of iron wire be reared : atD (which is the region of greater force) the wire will be rearedmore near perpendicular than at C, the region of less force.Thus can we discern the stronger and more powerful part of aloadstone, else not recognizable by the senses.… … onsiderable part of its surface projecting a little above therest: such terrella, though 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…

Magnetism

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