A descriptive and historical account of hydraulic and other machines for raising water, ancient and modern : with observations on various subjects connected with the mechanic arts: including the progressive development of the steam engine (1876)
Ewbank, Thomas, 1792-1870 · New York : Scribner, Armstrong · leaf 236
mer is raised. Now the atmosphere rests equally on both orifices ofthe pipe, the open one in the well, and the other covered by a valve al.he bottom of the cylinder: in other words, it presses equally on thewater in the cylinder and in the well wliich covers both ;* but when by ^Not absolutely so.… … No. 90. Coni.Tion Metallu; Ilinii). the depression of the handle or lever, the sucker is raised, this equality isdestroyed, for tlie atmospheric column over the cylinder, and consecjuently over the valve O is lifted up, andsustained by the sucker alone; ittherefore no longer presses on theupper…
Pumping machinery
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