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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 356

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 356
region on the pe-riphery of the globe is found by the linea fiducics AB. Drawthe diagram on a suitable planed board, and to its centre attach DIAGRAM OF THE ROTATION OF MAGNETIZED IRON. 299 the centre of the angle of the quadrant A^ so that the quad-rant may rotate on that centre. But it must be… … hypothesis, and it will be of very great interest to observe it indifferent localities, for this variation of dip seems to presentmore difficulty than the variation of direction ; but it is readilyunderstood with dip instruments when it disagrees either byplus or by minus with the diagram. 300…

Magnetism

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