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Magnetic dip angle measurement, 1600

Magnetic dip angle measurement, 1600

C030/0506

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50.2 MB (4.0 MB compressed)

3448 x 5084 pixels

29.2 x 42.9 cm ⏐ 11.5 x 16.9 in (300dpi)

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Credit

LIBRARY OF CONGRESS / SCIENCE PHOTO LIBRARY LIBRARY OF CONGRESS / SCIENCE PHOTO LIBRARY

Caption

Magnetic dip angle measurement, illustrated in 'De Magnete' (On the Magnet, 1600) by English physicist William Gilbert (1544-1603). Magnetic dip is the angle by which a compass needle dips compared to the horizontal, an angle that varies with location on the Earth's surface. Here, the compass dial is freely floating and has dipped to the left. 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 185, chapter 1, book 5.

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