Gilbert on magnetic declination,1600

Numéro d’image : 12055764
Gilbert on magnetic declination,1600
Gilbert on magnetic declination. Page from 'De Magnete' (On the Magnet,1600) by English physicist William Gilbert (1544-1603). This diagram shows a long lodestone with magnetic compass directions,part of Gilbert's attempts to explain magnetic declination,where a compass needle does not point to true North. 'De Magnete' reported Gilbert's studies of magnetism and electricity. He theorised that the two forces were closely related. He also considered the Earth to be a spherical magnet. This first edition of 'De Magnete' consisted of 115 chapters in six books and 246 pages. This is page 164,chapter 7,book 4
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Crédit: Science Photo Library / Library of Congress
Taille de l’image : 3399 px × 5148 px
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