Clipping advertising portraits of outstanding chemists and physicists. The advertised portraits will be heliogravure prints, a printing process that uses copper plates to create engravings and the preferred method for high-quality image reproductions.
Wilhelm Engelmann. “Bildnisse Hervorragender Chemiker Und Physiker in Heliogravüre,” 1914. Papers of Georg and Max Bredig, Box 3, Folder 3. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/b9udnx3.
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