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To join by means of joggles, so as to prevent sliding apart; sometimes, loosely, to dowel. The struts of a roof are joggled into the truss posts. Gwilt.

A bar, pin or wedge, to secure a crank, pulley, coupling, etc., upon a shaft, and prevent relative turning; sometimes holding by friction alone, but more frequently by its resistance to shearing, being usually embedded partly in the shaft and partly in the crank, pulley, etc.

The projection on the tang of the blade of a pocket knife, which prevents the edge of the blade from striking the spring. See Illust. of Pocketknife.

A member of a common form of truss, as a roof truss. It is strictly a tie, intended to prevent the sagging of the tiebeam in the middle. If there are struts, supporting the main rafters, they often bear upon the foot of the king-post. Called also crown-post.

The clothing (esp., an outer, wooden covering), as of a steam cylinder, applied to prevent the radiation of heat; a covering of lags; -- called also deading and cleading.

ula. -- Safety lamp, a miner's lamp in which the flame is surrounded by fine wire gauze, preventing the kindling of dangerous explosive gases; -- called also, from Sir Humphry Davy the inventor, Davy lamp. -- To smell of the lamp, to bear marks of great study and labor, as a literary composition.

door. To find the latchstring out, to meet with hospitality; to be welcome. (Intrusion is prevented by drawing in the latchstring.) [Colloq. U.S.]

Of a character which prevents the compositor from earning the usual wages; -- opposed to fat; as lean copy, matter, or type.

er; -- either affirmatively, by positive act, or negatively, by neglecting to restrain or prevent.

An embankment to prevent inundation; as, the levees along the Mississippi; sometimes, the steep bank of a river. [U. S. ]

A thread or string for tying the blood vessels, particularly the arteries, to prevent hemorrhage.

ghtning arrester (Telegraphy), a device, at the place where a wire enters a building, for preventing injury by lightning to an operator or instrument. It consists of a short circuit to the ground interrupted by a thin nonconductor over which lightning jumps. Called also lightning discharger. -- Lightning bug (Zoöl.),…

lank forming part of the lining of a ship's floor immediately above the timbers, so as to prevent the limbers from becoming clogged. -- Limber box or chest (Mil.), a box on the limber for carrying ammunition. -- Limber rope, Limber chain or Limber clearer (Naut.), a rope or chain passing through the limbers of a ship…

A pin used to prevent the wheel of a vehicle from sliding off the axletree.

A medicine which tends to prevent stone in the bladder.

rom. The process depends, in the main, upon the antipathy between grease and water, which prevents a printing ink containing oil from adhering to wetted parts of the stone not covered by the design. See Lithographic limestone, under Lithographic.

A place from which egress is prevented, as by a lock. Dryden.

A weight or block near the free end of a hoisting rope to prevent it from being drawn through the sheave. Log board (Naut.), a board consisting of two parts shutting together like a book, with columns in which are entered the direction of the wind, course of the ship, etc., during each hour of the day and night. These…

To prevent from gaining or obtaining. O false heart ! thou hadst almost betrayed me to eternal flames, and lost me this glory. Baxter. To lose ground, to fall behind; to suffer gradual loss or disadvantage. -- To lose heart, to lose courage; to become timid. "The mutineers lost heart." Macaulay. -- To lose one's head…

One of a number of riotous persons in England, who for six years (1811-17) tried to prevent the use of labor-saving machinery by breaking it, burning factories, etc.; -- so called from Ned Lud, a half-witted man who some years previously had broken stocking frames. J. & H. Smith. H. Martineau.