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be for directing a jet of air into a fire or into the flame of a lamp or candle, so as to concentrate the heat on some object.

An apparatus, especially an inclined trough or vat, in which stamped ore is concentrated by subjecting it to the action of rynning water so as to wash out the lighter and less valuable portions.

A burner consisting of two or more concentric Argand burners (the inner rising above the outer) and a central tube by which oxygen gas or common air is supplied.

A lantern, with a thick glass lens on one side for concentrating the light on any object; also, the lens itself. Dickens.

m the sap of the bitter cassava (Manihot utilissima) deprived of its poisonous qualities, concentrated by boiling, and flavored with aromatics. See Pepper pot.

own color, and brilliant adamantine luster; also massive, sometimes in compact forms with concentric fibrous structure resembling wood (wood tin), also in rolled fragments or pebbly (Stream tin). It is the chief source of metallic tin. See Black tin, under Black.

ing to catoptrics; produced by reflection. Catoptric light, a light in which the rays are concentrated by reflectors into a beam visible at a distance.

A principal or important point of concentration; the nucleus around which things are gathered or to which they tend; an object of attention, action, or force; as, a center of attaction.

To be collected to a point; to be concentrated; to rest on, or gather about, as a center. Where there is no visible truth wherein to center, error is as wide as men's fancies. Dr. H. More. Our hopes must center in ourselves alone. Dryden.

A circle; a concentric layer. [Obs.] "The circinations and spherical rounds of onions." Sir T. Browne.

Compact; pressed close; concentrated; firmly united.

A rearrangement or concentration of the different constituents of one or more substances into a distinct and definite compound of greater complexity and molecular weight, often resulting in an increase of density, as the condensation of oxygen into ozone, or of acetone into mesitylene. Condensation product (Chem.), a s…

To make more close, compact, or dense; to compress or concentrate into a smaller compass; to consolidate; to abridge; to epitomize. In what shape they choose, Dilated or condensed, bright or obscure. Milton. The secret course pursued at Brussels and at Madrid may be condensed into the usual formula, dissimulation, proc…

-- Bull's-eye condenser, or Bull's-eye (Optics), a lens of short focal distance used for concentrating rays of light. -- Injection 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 brin…

Consisting of a series of parallel cones, each made up of many concentric cones closely packed together; -- said of a kind of structure sometimes observed in sedimentary rocks.

Gathered into a ball or a mass; collected together; concentrated; as, conglomerate rays of light. Beams of light when they are multiplied and conglomerate. Bacon. Fluids are separated in the liver and the other conglobate and conglomerate glands. Cheyne.

A peculiar phase of the aurora borealis, formed by the concentration or convergence of luminous beams around the point in the heavens indicated by the direction of the dipping needle.

A conjunction or concentration of rays in one point. Bacom

The area inclosed between two concentric perimeters.

pertaining to the Cycloidei. Cycloid scale (Zoöl.), a fish scale which is thin and shows concentric lines of growth, without serrations on the margin.