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are. Porcelain, by being pure, is apt to break. Dryden. Ivory porcelain, porcelain with a surface like ivory, produced by depolishing. See Depolishing. -- Porcelain clay. See under Clay. -- Porcelain crab (Zoöl.), any crab of the genus Porcellana and allied genera (family Porcellanidæ). They have a smooth, polished c…

a handsome marine gastropod shell (Oliva porphyria), having a dark red or brown polished surface, marked with light spots, like porphyry.

One of the furs; a surface composed of patches which are supposed to represent crutch heads; they are always alternately argent and azure, unless otherwise specially mentioned. Counter potent (Her.), a fur differing from potent in the arrangement of the patches.

r of an object; sometimes, in microscopes, the number of times it multiplies the apparent surface.

ttom (whence the name), may be diffused through the solution, or may float at or near the surface. Red precipitate (Old. Chem), mercuric oxide (HgO) a heavy red crystalline powder obtained by heating mercuric nitrate, or by heating mercury in the air. Prepared in the latter manner, it was the precipitate per se of the…

- probably so called from the resemblance of the wartlike crystals to the mammillæ on the surface of prehnite.

st some obstacle or opposing force; a force in the nature of a thrust, distributed over a surface, often estimated with reference to the upon a unit's area. Atmospheric pressure, Center of pressure, etc. See under Atmospheric, Center, etc. -- Back pressure (Steam engine), pressure which resists the motion of the pisto…

The art of printing from the surface of type, plates, or engravings in relief, by means of a press; the work so done. MacKellar.

The first coating of plaster in work of three coats upon laths. Its surface is scratched once to form a better key for the next coat. In the United States called scratch coat. Brande & C.

To lay the first color, coating, or preparation upon (a surface), as in painting; as, to prime a canvas, a wall.

The first coating of color, size, or the like, laid on canvas, or on a building, or other surface.

a negative, a transparent drawing, or the like, by the action of light upon a sensitized surface. Printed goods, textile fabrics printed in patterns, especially cotton cloths, or calicoes.

uble refraction is thrown out of the field by total reflection from the internal cemented surface, and the extraordinary, or polarized, image alone is transmitted.

To extend; -- applied to a line, surface, or solid; as, to produce a side of a triangle.

Descending far below the surface; opening or reaching to a great depth; deep. "A gulf profound." Milton.

Any method of representing the surface of the earth upon a plane. Conical projection, a mode of representing the sphere, the spherical surface being projected upon the surface of a cone tangent to the sphere, the point of sight being at the center of the sphere. -- Cylindric projection, a mode of representing the sphe…

A jutting out beyond a surface.

Standing out, or projecting, beyond the line surface of something; jutting; protuberant; in high relief; as, a prominent figure on a vase.

The act of turning the palm or palmar surface of the forefoot downward.

Sloping, with reference to a line or surface; declivous; inclined; not level. Since the floods demand, For their descent, a prone and sinking land. Blackmore.