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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 243

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 243
ILLIAM GILBERT. Describe a terrella with poles A, B ; from its mass sepa-rate the small part EF, and suspend that by a fine thread in acavity or pit in the terrella. E then does not seek the pole Abut the pole B, and F turns to A, behaving quite differentlyfrom the iron bar CD; for, there, C,… … the end E of the solitary part cut out of the terrella and notbrought near the rest of the stone would turn to the south ;but the end C of the iron bar would, if placed outside themagnetic field, turn to the north. Suppose that in the un-broken terrella the part EF gave the same direction as…

Magnetism

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