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 317
movable compass-box be balanced below {sub-tuslibratd) with a heavy weight of 16 pounds. On the edge ofthe suspended box at beginnings opposite quadrants, a semi-circle rising in the middle to a point (conum) is to be erected(the feet of the semicircle at both sides being fastened in holeson the… … FINDING THE AMOUNT OF THE VARIATION. 26l as it were (of the compass-box), like the beam of a balance,with such a joint that it may move. At the ends of the ruleare small sights with holes through which we may observe thesun and stars. By means of the rising or the setting sun atthe equinoxes, the…
Magnetism
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