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Hy′dro-stat′ic-press pump.

A pump used in hydrostatic presses. The example (A, plate opposite page 1150) gives one form. q is the water-cistern and r the pump-barrel, which has a sucking tube t and a conical valve s. The plunger is operated by the lever, which may be pivoted in either of the holes shown at x on the standard, to obtain greater or less quickness of stroke; it is connected with the standard by a link. k is a safetyvalve and z the discharge-valve, the rise and fall of which is regulated by a screw placed over it. On lift ing the plunger, water is drawn into the barrel r through the tube t, and by depressing it the water is forced out through the pipe j, the valve z rising to permit its passage. See also C D, same plate.

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1150 AD (1)
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