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The firing pin of a breechloader. Plunger bucket, a piston, without a valve, in a pump. -- Plunger pole, the pump rod of a pumping engine. -- Plunger pump, a pump, as for water, having a plunger, instead of a piston, to act upon the water. It may be single-acting or double- acting

ngine, used in mines, in Cornwall and elsewhere, and for water works. A heavy pump rod or plunger, raised by the steam, forces up the water by its weight, in descending.

One who, or that which, ducks; a plunger; a diver.

A pump having a solid piston, or plunger, for drawing and forcing a liquid, as water, through the valves; in distinction from a pump having a bucket, or valved piston.

tatic 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 p…

the other end. The mirror is pivoted so that it can be moved in one direction by a small plunger operated by an elastic metal diaphragm which closes a tube connected with the engine cylinder. It is also moved at right angles to this direction by a reducing motion, called a reproducer, so as to copy accurately on a sma…

conical recess in the seat when the valve is closed. See the valves shown in Illusts. of Plunger pump, and Safety valve, under Plunger, and Safety.

The plunger of a hydraulic press. Ram's horn. (a) (Fort.) A low semicircular work situated in and commanding a ditch. [Written also ramshorn.] Farrow. (b) (Paleon.) An ammonite.

The rod to which the bucket, or plunger, of a pump is attached; a pump rod. Spear foot, the off hind foot of a horse. -- Spear grass. (Bot.) (a) The common reed. See Reed, n., 1. (b) meadow grass. See under Meadow. -- Spear hand, the hand in which a horseman holds a spear; the right hand. Crabb. -- Spear side, the m…

The movement, in either direction, of the piston plunger, piston rod, crosshead, etc., as of a steam engine or a pump, in which these parts have a reciprocating motion; as, the forward stroke of a piston; also, the entire distance passed through, as by a piston, in such a movement; as, the piston is at half stroke.…

ole through which a movable cylindrical body, as the paston rod of a steam engine, or the plunger of a pump, slides back and forth, or in which a shaft turns. It usually consists of a box or chamber, made by an enlargement of part of the hole, forming a space around the rod or shaft for containing packing which is comp…