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Diagram of Simple and Compound Atmosphere taken fron "An Experimental Essay on the Consitution of mixed Gases; on the force of steam or Vapour from Water and other Liquids in different temperatures, both in Torricellion Vacuum and in Air; on Evaporation; and on the Expansion of Gases by Heat." by Mr John Dalton. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.