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, to begin to dig or to form the lines of approach. Trench cavalier (Fort.), an elevation constructed (by a besieger) of gabions, fascines, earth, and the like, about half way up the glacis, in order to discover and enfilade the covered way. -- Trench plow, or Trench plough, a kind of plow for opening land to a greate…

ricanus) of the family Ciniflonidæ, living among the dead branches of evergreen trees. It constructs a triangular web, or net, usually composed of four radii crossed by a double elastic fiber. The spider holds the thread at the apex of the web and stretches it tight, but lets go and springs the net when an insect comes…

A line of fortifications, usually rough, constructed to prevent the passage of an enemy across a region. [Sp. Amer.]

One of any savage race that dwells in caves, instead of constructing dwellings; a cave dweller. Most of the primitive races of man were troglodytes. In the troglodytes' country there is a lake, for the hurtful water it beareth called the "mad lake." Holland.

A pit in the form of an inverted cone or pyramid, constructed as an obstacle to the approach of an enemy, and having a pointed stake in the middle. The pits are called also trapholes.

trusses when left visible, as in open timber roofs, often contain members not needed for construction, or are built with greater massiveness than is requisite, or are composed in unscientific ways in accordance with the exigencies of style. Truss rod, a rod which forms the tension member of a trussed beam, or a tie ro…

A more or less cylindrical, and often spiral, case secreted or constructed by many annelids, crustaceans, insects, and other animals, for protection or concealment. See Illust. of Tubeworm.

Any annelid which constructs a tube; one of the Tubicolæ.

A division of annelids including those which construct, and habitually live in, tubes. The head or anterior segments usually bear gills and cirri. Called also Sedentaria, and Capitibranchiata. See Serpula, and Sabella.

ilroads under elevated ground, for the formation of roads under rivers or canals, and the construction of sewers, drains, and the like.

A water wheel, commonly horizontal, variously constructed, but usually having a series of curved floats or buckets, against which the water acts by its impulse or reaction in flowing either outward from a central chamber, inward from an external casing, or from above downward, etc.; -- also called turbine wheel.…

A revolving tower constructed of thick iron plates, within which cannon are mounted. Turrets are used on vessels of war and on land.

That by which a building is underpinned; the material and construction used for support, introduced beneath a wall already constructed.

A description or plan of the heavens and the heavenly bodies; the construction of celestial maps, globes, etc.; uranology.

The act of constructing vaults; a vaulted construction.

The act, art, or practice, of versifying, or making verses; the construction of poetry; metrical composition.

The art of making roads or ways for traveling, including the construction of bridges, canals, viaducts, etc. [R.] R. Park.

thus able to travel considerable distances over the land at night, whence the name. They construct a curious nest for their young. Called also langya. -- Walking gentleman (Theater), an actor who usually fills subordinate parts which require a gentlemanly appearance but few words. [Cant] -- Walking lady (Theater), an…

Water confined in specially constructed compartments in a vessel's hold, to serve as ballast.

An aquatic European spider (Argyoneta aquatica) which constructs its web beneath the surface of the water on water plants. It lives in a bell-shaped structure of silk, open beneath like a diving bell, and filled with air which the spider carries down in the form of small bubbles attached one at a time to the spinnerets…