Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 175
Fig. 126. 158 MOLAR DYNAMICS. A pressure of 15 pounds per square inch is quite generallyadopted by engineers as a unit of gaseous pressure, and iscalled an atmosphere. Physicists, however, generally measurepressure in terms of cm or mm of mercury at 0° C.; that is,the hight in m,m of mercury that… … Fig. 127. 131. The barometer. — The hight of the col-umn of mercury supported by atmospheric pres-sure is quite independent of the area, of thesurface of the mercury pressed upon ; hence theapparatus is more conveniently constructed inthe form represented in Fig. 127. A straight tube about 34…
Physics
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