File:Stephen Hale - pneumatic trough.jpg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	15:22, 19 September 2007		856 × 985 (201 KB)	commons>Ragesoss	{{Information \|Description= English natural philosopher Stephen Hale's pneumatic trough. A similar device was used by Joseph Priestley for the production of novel "airs", and for performing the "nitrous air test". \|Source= Hale's 1727 work, as reproduced

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File change date and time	15:09, 19 September 2007
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