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A high and narrow tank, with a central cylinder for the introduction of compressed air, used in the agitation and settling of pulp (pulverized ore and water) during treatment by the cyanide process; -- so named because, though originally devised in New Zealand, it was first practically introduced in Pachuca, Mexico.…

Belonging to, or connected with, ancient art. "The paleotechnic men of central France." D. Wilson.

One of several upright slender calcareous processes which surround the central part of the calicle of certain corals.

Vast plains in the central and southern part of the Argentine Republic in South America. The term is sometimes used in a wider sense for the plains extending from Bolivia to Southern Patagonia. Pampas cat (Zoöl.), a South American wild cat (Felis pajeros). It has oblique transverse bands of yellow or brown. It is about…

A fine plaited hat, made in Central America of the young leaves of a plant (Carludovica palmata).

A picture presenting a view of objects in every direction, as from a central point.

r a city or town, inclosed and kept for ornament and recreation; as, Hyde Park in London; Central Park in New York.

e park or garden of a larger edifice, or united with other parts, and forming an angle or central feature of a large pile.

against which a lever strikes, to limit its motion. -- Pin drill (Mech.), a drill with a central pin or projection to enter a hole, for enlarging the hole, or for sinking a recess for the head of a bolt, etc.; a counterbore. -- Pin grass. (Bot.) See Alfilaria. -- Pin hole, a small hole made by a pin; hence, any very…

To destroy the central nervous system of (an animal, as a frog), as by passing a stout wire or needle up and down the vertebral canal.

A long, flat-bottomed canoe, used for the navigation of rivers and lagoons in Central America. Squier.

ivot bridge, a form of drawbridge in which one span, called the pivot span, turns about a central vertical axis. -- Pivot gun, a gun mounted on a pivot or revolving carriage, so as to turn in any direction. -- Pivot tooth (Dentistry), an artificial crown attached to the root of a natural tooth by a pin or peg.…

rmed from the morula by the divergence of its cells in such a manner as to give rise to a central space, around which the cells arrange themselves as an envelope; an embryonic form intermediate between the morula and gastrula. Sometimes used as synonymous with gastrula.

The central column of parenchyma in a growing stem or root.

A division of Radiolaria. It includes those having one more central capsules.

Of or pertaining to Polynesia (the islands of the eastern and central Pacific), or to the Polynesians.

nd reproductive zooids, and by slender dactylozooids near the margin. The disk contains a central float, or pneumatocyst.

nuchus, especially T. Americanus (formerly T. cupido), which inhabits the prairies of the central United States. Applied also to the sharp-tailed grouse. -- Prairie clover (Bot.), any plant of the leguminous genus Petalostemon, having small rosy or white flowers in dense terminal heads or spikes. Several species occur…

Wires leading from various points of an electric system to a central station, where a voltmeter indicates the potential of the system at those points.

e plane, each in the direction of a line drawn through it from a given point of sight, or central point; as, the projection of a sphere. The several kinds of projection differ according to the assumed point of sight and plane of projection in each.