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 286
BOOK IV. CHAPTER I. OF VARIATION. So far we have been treating of direction as if there wereno such thing as variation ; for we chose to have variation leftout and disregarded in the foregoing natural history, just as ifin a perfect and absolutely spherical terrestrial globe variationcould not…
Magnetism
Internet Archive · Boston College Libraries · Public Domain Mark 1.0. Free to use for anything.