Addyman, Frank Thornton · London : Scott, Greenwood & co. · leaf 142
AIR-PUMPS. Ill its extreme slowness. To overcome this, pumps have beendevised with several fall tubes. Geisslers Pump,—This pump makes use of the torricel-lian vacuum of a specially constructed barometer tube. Fried-richs variety of the Geissler pump is shown in the diagram … Fig. 38.—Geisslers Pump. (Fig;. 38). The only complicated portion of the apparatus isthe stop-cock, C. In the position shown in the figure it con-nects the vessel, A, with the tube leading to B, and thence tothe outer air. If it were turned through an angle of 90°, thevessel, A, would be completely…
X-rays
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