Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 118
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. … Treadle lor Air Pump. of the Sticking of the valves, the valve seats are rubbedover with a very soft lead pencil, thus imparting to them asHght coating of plumbago, to which the oiled silk will not 96 EXPERIMENTAL SCIENCE. adhere. As an elastic rubber pump barrel of the kind de-scribed requires…
Physics · Lantern projection · Electric apparatus and appliances
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