Illustration of a galvanometer, a device used to detect and measure small amounts of electrical current through the use of a magnetic needle or a coil in a magnetic field.
Ward, Lock. “Galvanometer.” Wonders of Electricity and the Elements, Being a Popular Account of Modern Electrical and Magnetic Discoveries, Magnetism and Electric Machines, the Electric Telegraph and the Electric Light, and the Metal Bases, Salt, and Acids. London, England, 1870–1900. https://digital.sciencehistory.org/works/wnxr999.
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