Old illustration of steam digester invented by French physicist Denis Papin in 1679. Original, by unknown author, was published on L'Eau, by G. Tissandier, Hachette, Paris, 1873

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Old illustration of steam digester invented by French physicist Denis Papin in 1679. Original, by unknown author, was published on L'Eau, by G. Tissandier, Hachette, Paris, 1873