. Appleton's dictionary of machines, mechanics, engine-work, and engineering. the movements are not slow and regular, the mercury is very apt to be thrown out; to prevent whichthe upper end of the vessel containing it is dished or enlarged. For the reasons above stated, theyhave never been extensively employed in the arts. If a common atmospheric pump be inverted, as shown in Figs. 3130 and 3131, its cylinder immersedin water, and the valves of the upper and lower boxes reversed, it becomes a forcing, or, as it is some-times named, a lifting pump; because the contents of the cylinder are lifte
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. the movements are not slow and regular, the mercury is very apt to be thrown out; to prevent whichthe upper end of the vessel containing it is dished or enlarged. For the reasons above stated, theyhave never been extensively employed in the arts. If a common atmospheric pump be inverted, as shown in Figs. 3130 and 3131, its cylinder immersedin water, and the valves of the upper and lower boxes reversed, it becomes a forcing, or, as it is some-times named, a lifting pump; because the contents of the cylinder are lifted up when the piston israised, instead of being driven out from below by its descent. In a lifting pump the liquid is expelledfrom the top of the cylinder—in a forcing one from the bottom : it is the water above the piston that israised by the former; and that which enters below it, by the latter. The piston-rod in the figure is at-tached to an uon frame that is suspended to the end of a beam or lever. The valve on the top of thepiston, like that at the end of the cylind
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
