The first version of a pressure cooker was created by Denis Papin, French physicist and mathematician (1647-1712). In 1679 he made a large cast iron vessel with a tightly fitted lid that locked.
His invention raised the boiling point of water and at this higher temperature, bones softened and meat cooked in quick time. H promoted it as, "A New Digester or Engine, for softaing bones, the description of its makes and use in cookery, voayages at see, confectionary, making of drinks, chemistry, and dying, etc."
The early models were cumbersome and the "digester" required a specially-built furnace and it was somewhat dangerous to use. Regulating the steam and temperature was difficult to control so explosions were common. Papin then developed a safety valve his digester earned him membership in the Royal Society in 1680.
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