Blacksmith making a magnet. Page from 'De Magnete' (On the Magnet, 1600) by English physicist William Gilbert (1544-1603), showing a blacksmith making a magnet. The title of the chapter translates as: 'In what way Verticity exists in any Iron that hasbeen smelted though not excited by a lodestone'. Verticity was a term used in physics to refer to motion towards the Earth's poles. '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 139, chapter 12, book 3.

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