Gas pycnometers measure the volume and/or density of solid objects through gas displacement and Boyle's Law. This particular model was marketed as early as 1961.
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Hesketh, Dean D. “Beckman Model 930 Air Compression Pycnometer,” circa 1970. Beckman Historical Collection, Box 55, Folder 66. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/v118rd593.
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