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A stupid or obstinate fellow; an ass. Donkey engine, a small auxiliary engine not used for propelling, but for pumping water into the boilers, raising heavy weights, and like purposes. -- Donkey pump, a steam pump for feeding boilers, extinguishing fire, etc.; -- usually an auxiliary. -- Donkey's eye (Bot.), the larg…

g in two directions or with both motions; producing a twofold result; as, a double-acting engine or pump.

ough. -- Driving spring, a spring fixed upon the box of the driving axle of a locomotive engine to support the weight and deaden shocks. [Eng.] Weale. -- Driving wheel (Mach.), a wheel that communicates motion; one of the large wheels of a locomotive to which the connecting rods of the engine are attached; -- called…

so Zamboni's , from the names of the two earliest constructors of it. -- Dry pipe (Steam Engine), a pipe which conducts dry steam from a boiler. -- Dry plate (Photog.), a glass plate having a dry coating sensitive to light, upon which photographic negatives or pictures can be made, without moistening. -- Dry-plate p…

Silent; mute; noiseless; as a dummy engine.

ns of two cutting tools, on opposite sides of the piece operated upon. -- Duplex pumping engine, a steam pump in which two steam cylinders are placed side by side, one operating the valves of the other. -- Duplex querela Etym: [L., double complaint] (Eccl. Law), a complaint in the nature of an appeal from the ordinar…

The efficiency of an engine, especially a steam pumping engine, as measured by work done by a certain quantity of fuel; usually, the number of pounds of water lifted one foot by one bushel of coal (94 lbs. old standard), or by 1 cwt. (112 lbs., England, or 100 lbs., United States).

Pertaining to an eccentric; as, the eccentric rod in a steam engine.

The ratio of useful work to energy expended. Rankine. Efficiency of a heat engine, the ratio of the work done an engine, to the work due to the heat supplied to it.

A jet jump for lifting water or withdrawing air from a space. Ejector condenser (Steam Engine), a condenser in which the vacuum is maintained by a jet pump.

by, magnetism which is developed by the passage of an electric current. Electro-magnetic engine, an engine in which the motive force is electro-magnetism. -- Electro-magnetic theory of light (Physics), a theory of light which makes it consist in the rapid alternation of transient electric currents moving transversely…

producing motion and mechanical effects by the action of electricity; an electro-magnetic engine.

Pertaining to an engine. [Obs.] That one act gives, like an enginous wheel, Motion to all. Decker.

Variant of Engine. [Obs.] Chaucer.

. The schoolmen were like astronomers which did feign eccentries, and epicycles, and such engines of orbs. Bacon.

etween motives or reasons, with consequent indecision and doubt. Equilibrium valve (Steam Engine), a balanced valve. See under Valve.

rect a new commonwealth." Hooker. Erecting shop (Mach.), a place where large machines, as engines, are put together and adjusted.

pipe for carrying away steam that escapes through a safety valve. -- Escape valve (Steam Engine), a relief valve; a safety valve. See under Relief, and Safety. -- Escape wheel (Horol.), the wheel of an escapement.

An engine of war used for throwing viretons, large stones, and other missiles; a springal.

above the rank of colonel, also, all adjutants, inspectors, quartermasters, commissaries, engineers, ordnance officers, paymasters, physicians, signal officers, judge advocates; also, the noncommissioned assistants of the above officers.