The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies (1856)
Sprague, A. W. (Alfred White), 1821-1891 · Boston : Phillips, Sampson & Company · leaf 89
s out at the side stop-cock. Now turn the barrelso as to bring the valveseach over the other opening,and the whole operation willbe reversed. 69. The Condensing-Gaiige^ Fig. 48, is used in ^^^determining the degree of pressure to which air, steam and gasare subjected, and is screwed to the… … * Beware of mistaking this for the siphon-gauge below, and so connectingit with the exhaust-pump, as in such case an expensive mistake may occur bythe mercuiy being drawn over into the tubes of the pump. 84 VACUUxM-GAUGE. 49.
Physics
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