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84 Civil and Mechanical .Engineering. horse engine exhausts into a cylindrical wrought iron chamber about two and a half feet in diameter~ and thirty feet high. It is of boiler plate, about five-sixteenths of an inch thick. A stream of water delivered upon the top flows down over the whole exterior surface. This chamber maint~ins nearly a perfect vacuum. S. W. Ro~t-'cso-',-.doi:10.1016/0016-0032(69)90334-2 fatcat:6qpj2vh4vnalnoyi5w5bpfdg5q