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| Keywords: Stephen Hale - pneumatic trough.jpg English natural philosopher Stephen Hales' pneumatic trough A similar device was used by Joseph Priestley for the production of novel airs and for performing the nitrous air test Hale's 1727 work as reproduced in Joseph S Fruton Methods and Styles in the Development of Chemistry Philadelphia American Philosophical Society 2002 p 20 1727 Stephen Hales PD-old-100 Pneumatics Publications of the American Philosophical Society | ||||
