Ripper, William, 1853-1937 · London, New York [etc.] : Longmans, Green and co. · leaf 200
—The vacuum gaugerecords the ditFerencebetween the pressureof the external air andthe pressure in the condenser in inches of mercury, not in pounds Fir. 199. 184 STEAM-ENGINE THEORY AND PRACTICE. per square inch. The face of the gauge is graduated from 0 to 30in. of mercury. One inch of mercury =…
Steam-engines
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