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Simple apparatus for applying an electric shock from a Leyden jar

(Source: Bertholon P. De l'électricité du corps humain dans l'état de santé et de maladie. Ouvrage couronné par l'Académie de Lyon, dans lequel on traite de l'electricité de l'atmosphere ... / par m. l'abbé Bertholon. A Paris: Chez Croulbois ...; Et à Lyon: Chez Bernuset ..., 1786. Courtesy of the Wellcome Trust. Creative Commons Attribution 4.0 International [CC BY 4.0] license, creativecommons.org/licenses/by/4.0/deed.en.)