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Papin's Digester This instrument allowed water to be heated to a temperature higher than boiling point at atmospheric pressure, resulting in considerably high pressure inside. Papin designed a model of a digester in 1680 that allowed a piston inside a cylinder to move as a result of the action of the steam pressure produced by the heating of the water (http://www.uc.pt/ihti/proj/fisica/81ing.htm). Item#: 325,974 Photograph courtesy of Steve Turner, National Museum of American History, Smithsonian Institution.
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