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In Lennep, in the Lower Rhine Province of Germany
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He studied under German physicists Rudolf Clausius and August Kundt.
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He had follewed Kundt to University of Stasbourg to be his assistant.
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accustomed in Strasbourg, however, he returned there in 1876 as associate professor of physics.
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Six days earlier, he had made the world's first X-ray photograph, a picture of his wife's hand.
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