Various Geissler tubes for demonstration purposes. Invented by the glassblower, Johann Heinrich Wilhelm Geissler (1815-1878), a light is produced when an electric current is passed through the rarefied gas filled tubes.
Central Scientific Company. “Various Geissler Tubes.” Catalog K: Physical Apparatus for Universities and Colleges. Chicago, Illinois, May 1912. https://digital.sciencehistory.org/works/3f4625467.
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