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Hans Christian Oersted, who founded the study of electromagnetism. Digitally colored woodcut
Physicist Joseph HenryProfessor Joseph Henry, first Secretary of the Smithsonian Institution. Hand-colored woodcut of a 19th-century illustration
Joseph Henrys electromagnetic telegraph, 1832Joseph Henrys signal telegraph apparatus, the first electromagnetic telegraph, 1832. Hand-colored woodcut of a 19th-century illustration