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ble point. -- Double quarrel. (Eccl. Law) See Duplex querela, under Duplex. -- Double refraction. (Opt.) See Refraction. -- Double salt. (Chem.) (a) A mixed salt of any polybasic acid which has been saturated by different bases or basic radicals, as the double carbonate of sodium and potassium, NaKCO3.6H2O. (b) A mo…

Without luster, or dull and roughish to the touch; as, an earthy fracture.

rface of an ellipsoid (see Pedal); a surface used in explaining the phenomena of double refraction and their relation to the elastic force of the luminous ether in crystalline media.

ncealment, or of rising into view; sudden uprisal or appearance. The white color of all refracted light, at its very first emergence . . . is compounded of various colors. Sir I. Newton. When from the deep thy bright emergence sprung. H. Brooke.

That refractive condition of the eye in which the rays of light are all brought accurately and without undue effort to a focus upon the retina; -- opposed to hypermetropia, myopia, an astigmatism.

ly, the difference between these instants as noted by two observers. It is usually only a fraction of a second; -- sometimes applied loosely to differences of judgment or method occasioned by temperamental qualities of individuals. -- Theory of equations (Math.), the branch of algebra that treats of the properties of…

ters of minute particles or fibers, from the size of the colored rings produced by the diffraction of the light in which the objects are viewed.

To interrupt the continuity of (rock strata) by displacement along a plane of fracture; -- chiefly used in the p.p.; as, the coal beds are badly faulted.

A finegrained rock, flintlike in fracture, consisting essentially of orthoclase feldspar with occasional grains of quartz.

Fire box, the chamber of a furnace, steam boiler, etc., for the fire. -- Fire brick, a refractory brick, capable of sustaining intense heat without fusion, usually made of fire clay or of siliceous material, with some cementing substance, and used for lining fire boxes, etc. -- Fire brigade, an organized body of men…

To cleave; to divide; to crack or fracture.

The act of keeping fractured limbs cool by the use of a fan or some other contrivance. Dunglison.

f quartz, in color usually of a gray to brown or nearly black, breaking with a conchoidal fracture and sharp edge. It is very hard, and strikes fire with steel.

Causing fracture; breaking. [R.] H. Walpole.

One of a number of light or dark bands, produced by the interference of light; a diffraction band; -- called also interference fringe.

A refractory material consisting of crushed or ground siliceous stone, mixed with fire clay; -- used for lining Bessemer converters; also used for macadamizing roads.

Not wild, turbulent, or refractory; quiet and docile; tame; peaceable; as, a gentle horse.

e, translucent, and commonly transparent substance, white or colored, having a conchoidal fracture, and made by fusing together sand or silica with lime, potash, soda, or lead oxide. It is used for window panes and mirrors, for articles of table and culinary use, for lenses, and various articles of ornament.…

bolition of sight, with a diminution of transparency, a bluish or greenish tinge of the refracting media of the eye, and a hard inelastic condition of the eyeball, with marked increase of tension within the eyeball.

Having a glazed appearance; -- said of the fractured surface of some kinds of pin iron.