International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 416
ty upon every square unit, ex- cept upon that part of the surface occupied by the tube.According to Pascals law (see Art. 970), this pressure istransmitted in all directions. There being nothing in thetube, except the mercury, to counterbalance the upward pres-sure of the air, the mercury falls in… … PNEUMATICS. 405 be equilibrium, the pressure of the air per unit of area on theupper surface of the mercury in the glass must equal thepressure (weight) exerted per unit of area by the mercuryinside of the tube. Suppose that the area of the inside of thetube is one square inch ; then, since mercury…
Railroad engineering
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