2 Free Photos of Electromagnetic Instruments In The Museum Of Science And Industry (chicago)

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Ryan Electrometer, designed by Prof. Harris Ryan, early 20th century - Museum of Science and Industry (Chicago) - DSC06520
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Dip needle, by W. Wilson, 1 Belmont St., London, NW, for measuring vertical aspect of Earth's magnetic field, c. 1900 - Museum of Science and Industry (Chicago) - DSC06529
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