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 298
ancient writers tell.The constancy of the variation and the regard of the verso-rium toward a fixed point of the horizon in each region isshown by laying a very small versorium on a terrella of unevensurface: the needle always diverges from the meridian overan equal arc. It is shown also by the… … toward A, north; bring alongside the loadstone B, at suchdistance as to make the versorium turn to C and no further.Move the needle of the versorium as often as you will (yetwithout stirring either its case or the loadstone) and theneedle will ever surely return to the point C. Thus if you sohold…
Magnetism
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