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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 294

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 294
from the pole (7-ward. Sois the variation shown and the regions of greater force recog-nized. The more powerful surface is found also by means ofa slender iron wire two barley-corns long : for though it willstand upright on the pole of the terrella and in other parts VARIATION IS DUE TO EARTHS… … erect; and also when a piece of iron wire laid on the pole in-clines more to one side than the other. For experiment take

Magnetism

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