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The solid piston of a force pump; the instrument by which water is forced in a pump.

for forcing a crank on a shaft, or for drawing off a car wheel from the axle. -- Forcing pump. See Force pump (b).

n pen, a pen with a reservoir in the handle which furnishes a supply of ink. -- Fountain pump. (a) A structure for a fountain, having the form of a pump. (b) A portable garden pump which throws a jet, for watering plants, etc. -- Fountain shell (Zoöl.), the large West Indian conch shell (Strombus gigas). -- Fountain…

of arctic winters. Kane. -- Frost valve, a valve to drain the portion of a pipe, hydrant, pump, etc., where water would be liable to freeze. -- Jack Frost, a popular personification of frost.

The plaited hemp used for packing a piston, as of the steam engine and its pumps.

te pressure, as of steam, or the degree of rarefaction produced in the receiver of an air pump or other vacuum; a manometer. -- Sliding gauge. (Mach.) (a) A templet or pattern for gauging the commonly accepted dimensions or shape of certain parts in general use, as screws, railway-car axles, etc. (b) A gauge used only…

A fleshy, three-celled, many-seeded fruit, as the melon, pumpkin, cucumber, etc., of the order Cucurbitaceæ; and especially the bottle gourd (Lagenaria vulgaris) which occurs in a great variety of forms, and, when the interior part is removed, serves for bottles, dippers, cups, and other dishes.

ups forming, when placed together, a cavity from which the air can be withdrawn by an air pump; -- used to illustrate the pressure of the air. So called because invented by Otto von Guericke at Magdeburg.

The upper terminal pipe of a mining pump. Raymond.

The top of a pump.

(Condensing Engines), a receptacle for the hot water drawn from the condenser by the air pump. This water is returned to the boiler, being drawn from the hot well by the feed pump. -- In hot water (Fig.), in trouble; in difficulties. [Colloq.]

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, wh…

leading or admitting a fluid to a receiver, as steam to an engine cylinder, or water to a pump. -- Magnetic induction, the action by which magnetic polarity is developed in a body susceptible to magnetic effects when brought under the influence of a magnet. -- Magneto-electric induction, the influence by which a magn…

cularly to the forcible throwing in of a liquid, or aëriform body, by means of a syringe, pump, etc.

g so many more jack-o'-lanterns to the future historian." Lowell. (b) A lantern made of a pumpkin so prepared as to show in illumination the features of a human face, etc. -- Yellow Jack (Naut.), the yellow fever; also, the quarantine flag. See Yellow flag, under Flag.

vessels by means of a forcible jet of water ejected from the vessel, as by a centrifugal pump. -- Jet pump, a device in which a small jet of steam, air, water, or other fluid, in rapid motion, lifts or otherwise moves, by its impulse, a larger quantity of the fluid with which it mingles.

The cycle for the air engine proposed by Joule. In it air is taken by a pump from a cold chamber and compressed adiabatically until its pressure is eqal to that of the air in a hot chamber, into which it is then delivered, thereby displacing an equal amount of hot air into the engine cylinder. Here it expands adiabatic…

r sale. -- Junk vat (Leather Manuf.), a large vat into which spent tan liquor or ooze is pumped. -- Junk wad (Mil.), a wad used in proving cannon; also used in firing hot shot.

of a fluid through a crack, fissure, or other aperture; as, the leak gained on the ship's pumps. To spring a leak, to open or crack so as to let in water; to begin to let in water; as, the ship sprung a leak.

pened by lifting. -- Lift hammer. See Tilt hammer. -- Lift lock, a canal lock. -- Lift pump, a lifting pump. -- Lift tenter (Windmills), a governor for regulating the speed by adjusting the sails, or for adjusting the action of grinding machinery according to the speed. -- Lift wall (Canal Lock), the cross wall at…