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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 304

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 304
less according to divers causes.For we must take account ofthe force of true verticity ofeach place and of the elevatedregions, also of the distancesof those regions from the placeunder consideration and from theworlds poles; and these distancesare to be compared—a thing thatcannot be done with… … 248 WILLIAM GILBERT. meridian line, and did not present a broken and indentedcontour, the variations near the land would be without com-plexity, as in the figure. This is demonstrated with the aid of a long loadstonewhose poles are at the ends A, B: the middle of the load-stone and the equinoctial…

Magnetism

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