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 314
ff; Jacobs-staff ; a kind ofastrolabe. (For Radius and Quadrant, etc., consult R. Ainsworths LatinDiet.; the Century Diet., Volumes III, page 3213; V, pp. 4883, 4934-4935 ;J. E. Worcester, Diet, of Eng. Lang., 1881, Vol. I, page 786; Vol. II, page1163; Noah Webster, Int. Diet., 1891, pp. 1171,… … 258 WILLIAM GILBERT when the plank is placed accurately to the level of the horizonby the plane instrument with its perpendicular {instrumentopiano cum suo perpendiculo), turn the extremity of the pointertoward the north, so that the versorium shall rest just on themidline of its case, which…
Magnetism
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