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 85
ases are admittedentirely dry. The reality of the advantage is made very apparent bythe curves traced by the index of the manometer, or pressure gauge,when the water is present and when it is absent. In the two figureswhich follow, the first, Fig. 6, shows the violent oscillations, and theabrupt… … In both these figures, it will be seen that the curve descends, on theright, for a short distance below the horizontal line. This marks theperiod of admission of the gases to the cylinder when the pressure isnegative. The introduction of water into the cylinder, as here explained, consti-tutes the…
Machinery · Scientific apparatus and instruments
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