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The system of drains and their operation, by which superfluous water is removed from towns, railway beds, mines, and other works.

A boy who operates the harness cords of a hand loom; also, a part of power loom that performs the same office.

l substance used in the composition of medicines; any stuff used in dyeing or in chemical operations. Whence merchants bring Their spicy drugs. Milton.

f, screwing, and surfacing, by means 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 na…

; as, the duplication of cartilage cells. Carpenter. Duplication of the cube (Math.), the operation of finding a cube having a volume which is double that of a given cube.

muscular effort of men or animals, or the power developed by a motor, or that required to operate machinery.

also earthdin, earthquave, and earthshock. Earthquake alarm, a bell signal constructed to operate on the theory that a few seconds before the occurrence of an earthquake the magnet temporarily loses its power.

The operation connected with excavations and embankments of earth in preparing foundations of buildings, in constructing canals, railroads, etc.

. -- Eccentric sheave, or Eccentric pulley, an eccentric. -- Eccentric strap, the ring, operating as a journal box, that encircles and receives motion from an eccentric; -- called also eccentric hoop.

The operation performed with an écraseur.

An instrument intended to replace the knife in many operations, the parts operated on being severed by the crushing effect produced by the gradual tightening of a steel chain, so that hemorrhage rarely follows.

The operation of shaping or dressing the edge of anything, as of a piece of metal. Edging machine, a machine tool with a revolving cutter, for dressing edges, as of boards, or metal plates, to a pattern or templet.

Execution; performance; realization; operation; as, the law goes into effect in May. That no compunctious visitings of nature Shake my fell purpose, nor keep peace between The effect and it. Shak.

uce an effect or effects; producing a decided or decisive effect; efficient; serviceable; operative; as, an effective force, remedy, speech; the effective men in a regiment. They are not effective of anything, nor leave no work behind them. Bacon. Whosoever is an effective, real cause of doing his heighbor wrong, is cr…

g, or having adequate power or force to produce, an intended effect; adequate; efficient; operative; decisive. Shak. Effectual steps for the suppression of the rebellion. Macaulay. Effectual calling (Theol.), a doctrine concerning the work of the Holy Spirit in producing conviction of sin and acceptance of salvation by…

Power to produce effects; operation or energy of an agent or force; production of the effect intended; as, the efficacy of medicine in counteracting disease; the efficacy of prayer. "Of noxious efficacy." Milton.

Causing effects; producing results; that makes the effect to be what it is; actively operative; not inactive, slack, or incapable; characterized by energetic and useful activity; as, an efficient officer, power. The efficient cause is the working cause. Wilson.

To perfect with painstaking; to improve or refine with labor and study, or by successive operations; as, to elaborate a painting or a literary work. The sap is . . . still more elaborated and exalted as it circulates through the vessels of the plant. Arbuthnot.

The act or process of producing or refining with labor; improvement by successive operations; refinement.

An operation that consists in inserting needless in the part affected, and connecting them with the poles of a galvanic apparatus.