Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 118
that the air mav pass through the pump as indicated by thearrow, entering by one valve and escaping by the other. The pieces of rubber tube inclose the valve casings, sothat each valve has a little air-tiarht chamber of its own to GASES. 95 work in. The beveled ends of the rubber tube are… … Valve for Compression Pump. pressed by the foot, there will be ver} little air space leftin the pump. The four-foot rubber tube is attached to oneend of the pump for vacuum experiments, and to the oppo-site end for plenum experiments. To avoid any possibility Fig. 94.
Physics · Lantern projection · Electric apparatus and appliances
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