Valve Mechanisms
   The two valve mechanisms below are on display at the University Museum at the University of Mississippi. At the left is a ball-valve that is listed at 16 francs (about $3.20) in the 1853 catalogue of Lerebours et Secretan of Paris. It was probably purchased in the second half of the 1850s by Prof. F.A.P. Barnard, the second Professor of Natural Philosophy at the University. At the right is a model of a slide valve that is unmarked.
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