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An instrument for determining directions upon the carth's surface by means of a magnetized bar or needle turning freely upon a pivot and pinting in a northerly and southerly direction. He that firat discovered the use of the compass did more for the supplying and increase of useful commodities than those who built work…

Flattened to a level surface. [R.]

congruency of lines; as, the entire system of lines, each one of which meets two given surfaces, is a congruency.

The color or hue of the skin, esp. of the face. Tall was her stature, her complexion dark. Wordswoorth. Between the pale complexion of true love, And the red glow of scron and proud disdain. Shak.

Hollow and curved or rounded; vaulted; -- said of the interior of a curved surface or line, as of the curve of the of the inner surface of an eggshell, in opposition to convex; as, a concave mirror; the concave arch of the sky.

A concave surface, or the space bounded by it; the state of being concave.

center, as circles of different size, one within another. Concentric circles upon the surface of the water. Sir I. Newton. Concentrical rings like those of an onion. Arbuthnot.

s or depressions in form like one half of a bivalve shell; -- applied principally to a surface produced by fracture.

rticles into one mass; united in a solid form. The first concrete state, or consistent surface, of the chaos must be of the same figure as the last liquid state. Bp. Burnet.

ether; to meet. [Obs.] Anon they fierce encountering both concurred With grisly looks and faces like their fates. J. Hughes.

nion of two or more, with or without separation of some unimportant side products. -- Surface condensation, the system of condensing steam by contact with cold metallic surfaces, in distinction from condensation by the injection of cold water.

on condenser, a vessel in which steam is condensed by the direct contact of water. -- Surface condenser, an apparatus for condensing steam, especially the exhaust of a steam engine, by bringing it into contact with metallic surface cooled by water or air.

asses in unit time through unit area of plate whose thickness is unity, when its opposite faces differ in temperature by one degree. J. D. Everett. -- Thermometic conductivity (Physics), the thermal conductivity when the unit of heat employed is the heat required to raise unit volume of the substance one degree.…

Folded lengthwise along the midrib, the upper face being within; -- said of leaves or petals in vernation or æstivation.

prominence; particularly, an eminence at the end of a bone bearing a rounded articular surface; -- sometimes applied also to a concave articular surface.

also a right cone. More generally, any solid having a vertical point and bounded by a surface which is described by a straight line always passing through that vertical point; a solid having a circle for its base and tapering to a point or vertex.

A friction clutch with conical bearing surfaces.

Closely united by the coalescence, or sticking together, of contiguous faces, as in the case of the cotyledons of the live-oak acorn.

Relative position or aspect of the planets; the face of the horoscope, according to the relative positions of the planets at any time. They [astrologers] undertook . . . to determine the course of a man's character and life from the configuration of the stars at the moment of his birth. Whewell.

Characterized by having the pustules, etc., run together or unite, so as to cover the surface; as, confluent smallpox. Dunglison.