Machinery and processes of the industrial arts, and apparatus of the exact sciences (1869)
Barnard, Frederick A. P. (Frederick Augustus Porter), 1809-1889 · Washington, Govt. print. off. · leaf 509
occupy it al-most entirely. The mer-cury then fills the smallannular space between theplunger and the wall ofthe cylinder, and also thespace above the plungerKravogls Mercurial Air-pump. up to the valve. By this means the air is completely expelled; and as the valve is covered by asmall quantity of… … AIR-PUMPS. 493 the level of the mercury when the plunger is at its lowest depression.Communication between the receiver and the cylinder is opened, whenthe plunger is in this position, by an automatic arrangement, of whichone form is shown in the figure and will be easily understood, but whichmay…
Machinery · Scientific apparatus and instruments
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