Diagram depicting a medico-galvanic battery, a type of portable shock-producing electrotherapeutic device commonly in use between 1870 and 1920. Such devices provided both direct and alternating current and were thought to cure a wide variety of ailments.
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Ward, Lock. “Medico-Galvanic Battery.” 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/ucedlzb.
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