Greenhill, G. (George), Sir, 1847-1927 · London and New York, Macmillan and Co. · leaf 353
s, the gas inside 34.2 THE THEORY OP must be at a pressure WIttt^ Ib/ft^ (over atmosphericpressure); and this can be measured in a siphon gauge(fig. 71) by a column of water TF/D7rr2ft or 12 WjBTrr^uis high,the diiFerence of level of the water inside and outside thegasholder. Denoting the weight of… … Fig 70 To keep down the pressure of the gas, W must bemade as small as possible for a given volume F= irr^a;and this is secured by making a = r, or the height equalto half the diameter; the proof of this is a simple exercisein the Differential Calculus. Tlien, with these proportions, W=^Trr^m, or…
Hydrostatics
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