Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 181
above the levelof the water intowhich the tube Adips. hi practice theheight of the tube Adoes not exceed 26to 28 feet; for al-though the atmos-pheric pressure cansupport a highercolumn, the vacu-um produced inthe barrel is notperfect, owing tothe fact that thepiston does not fitexactly on the… … Fig. 154. Hydraulic Apparatus. 183 The action of this pump, a model of which is represented inFig. 154, depends both on exhaustion and on pressure. At thebase of the barrel, where it is connected with the tube A, there-is a valve, S, which opens upwards. Another valve, O, open-ing in the same…
Hydraulic machinery · Pumping machinery
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