Pamphlet advertising Spindler & Hoyer's apparatus for projecting models of crystalline structures. The device was intended for use in university classrooms for educational purposes. Spindler & Hoyer, (now Linos AG) founded in 1898, is an optical systems and equipment manufacturer located in Göttingen, Germany.
Spindler & Hoyer. “Die Stereo-Projektion Von Kristall-Gittern,” circa 1925. Papers of Georg and Max Bredig, Box 3, Folder 3. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/5927jvo.
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