Illustration of a declinometer from De Magnete by William Gilbert, published in 1600. Magnetic declination is the horizontal angle between the true geographic North Pole and the magnetic north pole, as figured
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File:Gilbert De Magnete Illo173.jpg - Wikimedia Commons
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De Magnete - Wikipedia
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William Gilbert, De Magnete, 1600 Photograph by Science Source
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William Gilbert
Illustration from De Magnete, etc. by William Gilbert (1600, translated 1900), showing an instrument to indicate the degrees of declination from the horizon for any latitude; 1600; On the Magnet, etc., available freely at Project Gutenberg; William Gilbert  ...
The Magnetic Attraction of William Gilbert, pioneer of geomagnetism | FifteenEightyFour | Cambridge University Press
Illustration from De Magnete, etc. by William Gilbert (1600, translated 1900), showing an instrument for measuring declination; 1600; On the Magnet, etc., available freely at Project Gutenberg; William Gilbert (1544–1603) Alternative names
William Gilbert Demonstrating the Magnet before Elizabeth I, 1598 - Ernest Board | WikiOO.org - Encyclopedia of Fine Arts
