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Moved or worked by pressure or flow of air; as, a pneumatic instrument; a pneumatic engine.

. [Slang] Pony chaise, a light, low chaise, drawn by a pony or a pair of ponies. -- Pony engine, a small locomotive for switching cars from one track to another. [U.S.] -- Pony truck (Locomotive Engine), a truck which has only two wheels. -- Pony truss (Bridge Building), a truss which has so little height that overhe…

steam, water, etc., may pass, as from a valve to the interior of the cylinder of a steam engine; an opening in a valve seat, or valve face. Air port, Bridle port, etc. See under Air, Bridle, etc. -- Port bar (Naut.), a bar to secure the ports of a ship in a gale. -- Port lid (Naut.), a lid or hanging for closing the…

ne or carried; easily transported; conveyed without difficulty; as, a portable bed, desk, engine. South.

One who, or that which, potches. Potcher engine (Paper Making), a machine in which washed rags are stirred in a bleaching solution.

To make a jarring noise, as in running; as, the engine pounds.

rth or exerted; strength, force, or energy in action; as, the power of steam in moving an engine; the power of truth, or of argument, in producing conviction; the power of enthusiasm. "The power of fancy." Shak.

f any kind; potent; mighty; efficacious; intense; as, a powerful man or beast; a powerful engine; a powerful argument; a powerful light; a powerful vessel. The powerful grace that lies In herbs, plants, stones, and their true qualities. Shak.

admission, as of steam, to the engine cylinder before the back stroke is completed, thus increasing the cushioning.

Ignition in an internal-combustion engine while the inlet valve is open or before compression is completed.

re, Center of pressure, etc. See under Atmospheric, Center, etc. -- Back pressure (Steam engine), pressure which resists the motion of the piston, as the pressure of exhaust steam which does not find free outlet. -- Fluid pressure, pressure like that exerted by a fluid. It is a thrust which is normal and equally inte…

obtained by chemical action, and applied to produce alternation of magnetic force. (b) An engine, or machine, the object of which is to receive and modify force and motion as supplied by some natural source, and apply them to drive other machines; as a water wheel, a water- pressure engine, a steam engine, a hot-air en…

-- Priming valve (Steam Eng.), a spring safety valve applied to the cylinder of a steam engine for discharging water carried into the cylinder by priming. -- Priming wire, a pointed wire used to penetrate the vent of a piece, for piercing the cartridge before priming.

usually consisting of a screw placed in the stern under water, and made to revolve by an engine; a propeller wheel.

itary and naval stores, equipments, etc. -- Public works, all fixed works built by civil engineers for public use, as railways, docks, canals, etc.; but strictly, military and civil engineering works constructed at the public cost.

a. & n. from pump. Pumping engine, a steam engine and pump combined for raising water. See Steam engine.

ns by moving bodily away from the seat while remaining parallel with it, -- used in steam engines, pumps, safety valves, etc. Its edge is often beveled, and fits in a 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.…

To run too fast at times, as a marine engine or screw, when the screw is lifted out of water by the action of a heavy sea.

An engine of torture, consisting of a large frame, upon which the body was gradually stretched until, sometimes, the joints were dislocated; -- formerly used judicially for extorting confessions from criminals or suspected persons. During the troubles of the fifteenth century, a rack was introduced into the Tower, and…

An engine of war used for butting or battering. Specifically: