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Hydro-stat′ic Bel′lows.

An instrument for illustrating the fact that the pressure of a small column of water balances that of another column of water, no matter how large. Water poured into the funnel-mouthed tube a (I, plate opposite page 1150) flows into the flexible-sided box b, and raises a weight c many times greater than its own. The weight may be lifted in this way until the combined pressure of it and the column of water in the bellows b is equal to that of a column of water having an equal surface and as high as the column in the tube c.

Bramah's and other hydrostatic or hyraulic presses depend on this principle.

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1150 AD (1)
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