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To have courage for; to attempt courageously; to venture to do or to undertake. What high concentration of steady feeling makes men dare every thing and do anything Bagehot. To wrest it from barbarism, to dare its solitudes. The Century.

To prevent from centralizing; to cause to withdraw from the center or place of concentration; to divide and distribute (what has been united or concentrated); -- esp. said of authority, or the administration of public affairs.

ing water from spirits and acids, by evaporation or repeated distillation; -- called also concentration, especially when acids are the subject of it. [Obs.]

That which burns by refraction, as a double convex lens, or the sun's rays concentrated by such a lens, sometimes used as a cautery.

either in whole or in part, as to area or volume, have not the same center; -- opposed to concentric.

r batteries, as the Grenet battery. Electropoion is best prepared by mixing one gallon of concentrated sulphuric acid diluted with three gallons of water, with a solution of six pounds of potassium bichromate in two gallons of boiling water. It should be used cold.

, forming an important ingredient of illuminating gas, and also obtained by the action of concentrated sulphuric acid in alcohol. It is an unsaturated compound and combines directly with chlorine and bromine to form oily liquids (Dutch liquid), -- hence called olefiant gas. Called also ethene, elayl, and formerly, bica…

To render pure or refined; to intensify or concentrate; as, to exalt the juices of bodies. With chemic art exalts the mineral powers. Pope.

tor; also, less frequently, an agent employed to absorb moisture, as calcium chloride, or concentrated sulphuric acid.

and the judgement therein, with an order for execution. Tomlins. Fluid extract (Med.), a concentrated liquid preparation, containing a definite proportion of the active principles of a medicinal substance. At present a fluid gram of extract should represent a gram of the crude drug.

orm of conductor, designed by Ferranti, for currents of high potential, and consisting of concentric tubes of copper separated by an insulating material composed of paper saturated with black mineral wax.

To bring to a focus; to focus; to concentrate. Light is focalized in the eye, sound in the ear. De Quincey.

A central point; a point of concentration. Aplanatic focus. (Opt.) See under Aplanatic. -- Conjugate focus (Opt.), the focus for rays which have a sensible divergence, as from a near object; -- so called because the positions of the object and its image are interchangeable. -- Focus tube (Phys.), a vacuum tube for Ro…

A moving, inclined, endless apron on which ore is concentrated by a current of water; a kind of buddle.

To concentrate; to come to a head, as a sore, and generate pus; as, a boil has gathered.

Assembling; collecting; used for gathering or concentrating. Gathering board (Bookbinding), a table or board on which signatures are gathered or assembled, to form a book. Knight. -- Gathering coal, a lighted coal left smothered in embers over night, about which kindling wood is gathered in the morning. -- Gathering…

To bring to a certain strength or grade of concentration; as, to gradate a saline solution.

substance formed from the hematin of blood, by removal of the iron through the action of concentrated sulphuric acid. Two like bodies, called respectively hæmatoporphyrin and hæmatolin, are formed in a similar manner.

thus, a section of a uniaxial crystal, cut normal to the vertical axis, shows a series of concentric colored rings with a single black cross; -- so called because produced by the interference of luminous waves. -- Interference fringe. (Optics) See Fringe.

Friedrich Krupp, at Essen in Prussia. Guns of over eight-inch bore are made up of several concentric cylinders; those of a smaller size are forged solid. Knight.