Appleton's dictionary of machines, mechanics, engine-work, and engineering . g tube, and the quotient will give the height to which the fluid will riseabove the first level. Example.—The diameter of the movable cover is 16 inches, and that of the communicating tube oneinch; then, supposing that the machine in the first instance is brought to a state of equilibrium, andthat a load of 1211 lbs. is applied on the cover, in addition to that which produces the equipoise; towhat height above the first level will the water ascend in the communicating tube ? Proceeding, according to the rule, we obtai
Appleton's dictionary of machines, mechanics, engine-work, and engineering . g tube, and the quotient will give the height to which the fluid will riseabove the first level. Example.—The diameter of the movable cover is 16 inches, and that of the communicating tube oneinch; then, supposing that the machine in the first instance is brought to a state of equilibrium, andthat a load of 1211 lbs. is applied on the cover, in addition to that which produces the equipoise; towhat height above the first level will the water ascend in the communicating tube ? Proceeding, according to the rule, we obtain -7854 (D2 + dr) = -7854 (162 + l2) = 201-8478 divisor; 1211consequently, by division it is h = — = 6 inches nearly. And exactly after the manner of these two examples, may any other case be calculated; but inapplying the principles to the determination of weights, mercury ought to be employed in preferenceto water, as it exerts an equal influence in less space, and besides, it is not subject to a change of den-sity by putrefaction and the like. HYDROSTATIC PRESS. 41. 42 HYDROSTATIC PRESS. Figs. 2280 and 2290 show the elevation and plan of a press capable of giving a pressure equalto 200 tons weight; also of a press -which is suitable for a pressure of 50 tons weight. Bv the arrange-ment shown, one set of pumps is sufficient to operate both presses. 2290.
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