Hydrostatic \Hy`dro*stat"ic\, Hydrostatical \Hy`dro*stat"ic*al\,
a. [Hydro-, 1 + Gr. ? causing to stand: cf. F. hydrostatique.
See Static.]
Of or relating to hydrostatics; pertaining to, or in
accordance with, the principles of the equilibrium of fluids.
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The first discovery made in hydrostatics since the time
of Archimedes is due to Stevinus. --Hallam.
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Hydrostatic balance, a balance for weighing substances in
water, for the purpose of ascertaining their specific
gravities.
Hydrostatic bed, a water bed.
Hydrostatic bellows, an apparatus consisting of a
water-tight bellowslike case with a long, upright tube,
into which water may be poured to illustrate the
hydrostatic paradox.
Hydrostatic paradox, the proposition in hydrostatics that
any quantity of water, however small, may be made to
counterbalance any weight, however great; or the law of
the equality of pressure of fluids in all directions.
Hydrostatic press, a machine in which great force, with
slow motion, is communicated to a large plunger by means
of water forced into the cylinder in which it moves, by a
forcing pump of small diameter, to which the power is
applied, the principle involved being the same as in the
hydrostatic bellows. Also called hydraulic press, and
Bramah press. In the illustration, a is a pump with a
small plunger b, which forces the water into the cylinder
c, thus driving upward the large plunder d, which performs
the reduced work, such as compressing cotton bales, etc.
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Hydraulic \Hy*drau"lic\, a. [F. hydraulique, L. hydraulicus, fr.
Gr. ?, ?, a water organ; "y`dwr water + ? flute, pipe. See
Hydra.]
Of or pertaining to hydraulics, or to fluids in motion;
conveying, or acting by, water; as, an hydraulic clock,
crane, or dock.
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Hydraulic accumulator, an accumulator for hydraulic
machinery of any kind. See Accumulator, 2.
Hydraulic brake, a cataract. See Cataract, 3.
Hydraulic cement, a cement or mortar made of hydraulic
lime, which will harden under water.
Hydraulic elevator, a lift operated by the weight or
pressure of water.
Hydraulic jack. See under Jack.
Hydraulic lime, quicklime obtained from hydraulic
limestone, and used for cementing under water, etc.
Hydraulic limestone, a limestone which contains some clay,
and which yields a quicklime that will set, or form a
firm, strong mass, under water.
Hydraulic main (Gas Works), a horizontal pipe containing
water at the bottom into which the ends of the pipes from
the retorts dip, for passing the gas through water in
order to remove ammonia.
Hydraulic mining, a system of mining in which the force of
a jet of water is used to wash down a bank of gold-bearing
gravel or earth. [Pacific Coast]
Hydraulic press, a hydrostatic press. See under
Hydrostatic.
Hydraulic propeller, a device for propelling ships by means
of a stream of water ejected under water rearward from the
ship.
Hydraulic ram, a machine for raising water by means of the
energy of the moving water of which a portion is to be
raised. When the rush of water through the main pipe d
shuts the valve at a, the momentum of the current thus
suddenly checked forces part of it into the air chamber b,
and up the pipe c, its return being prevented by a valve
at the entrance to the air chamber, while the dropping of
the valve a by its own weight allows another rush through
the main pipe, and so on alternately.
Hydraulic valve. (Mach.)
(a) A valve for regulating the distribution of water in the
cylinders of hydraulic elevators, cranes, etc.
(b) (Gas Works) An inverted cup with a partition dipping into
water, for opening or closing communication between two
gas mains, the open ends of which protrude about the
water.
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