Scientific American. [AUGUST 28, 1880. 134 | NEW AIR GUN. THE GLYCERINE BAROMETER, | wheeler was considered, on account of slowness, unfit for The marked influence of the variations in the pressure of constructed so _ almost beside its rival side-wheeler in point of speed. The in coal mines, has… … nufactured by ing pump pro- traps inthe overflow pipe. On my reporting the latter fact Price & Co., and has a specific gravity of 1:26, and on ac- count of its high point of ebullition the vapors have no per- ceptible tension at the ordinary temperature, and it will only ‘congeal at a very…
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