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pneumatic trough (plural pneumatic troughs)

  1. (chemistry) A piece of laboratory apparatus, consisting of a vessel filled with liquid (generally water or mercury), used for collecting gases. [from 19th c.]
    • 2004, Robert E Schofield, The Enlightened Joseph Priestley, Pennsylvania State University, published 2004, page 94:
      The pneumatic trough used at Calne was larger than that he had used in Leeds, and fresh water was not so conveniently at hand.

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