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ing, gearing in which the teeth or cogs are ranged round either the concave or the convex surface (properly the latter) of a cylindrical wheel; -- for transmitting motion between parallel shafts, etc.

Alluvial matter on the surface of land, not of recent origin. R. Jameson.

The formation or production of any geometrical magnitude, as a line, a surface, a solid, by the motion, in accordance with a mathematical law, of a point or a magnitude; as, the generation of a line or curve by the motion of a point, of a surface by a line, a sphere by a semicircle, etc.

the mathematical magnitude, which, by its motion, generates another magnitude, as a line, surface, or solid; -- called also describent.

of observations and measurements, the figures and areas of large portions of the earth's surface, or the general figure and dimenshions of the earth; or that branch of surveying in which the curvature of the earth is taken into account, as in the surveys of States, or of long lines of coast.

c line or curve, the shortest line that can be drawn between two points on the elipsoidal surface of the earth; a curve drawn on any given surface so that the osculating plane of the curve at every point shall contain the normal to the surface; the minimum line that can be drawn on any surface between any two points.…

tude (of a place), the angle included between a line perpendicular or normal to the level surface of water at rest at the place, and the plane of the equator; differing slightly from the geocentric latitude by reason of the difference between the earth's figure and a true sphere. -- Geographical mile. See under Mile.…

rnal and annual motions. -- Physical geography treats of the conformation of the earth's surface, of the distribution of land and water, of minerals, plants, animals, etc., and applies the principles of physics to the explanation of the diversities of climate, productions, etc. -- Political geography treats of the di…

h of mathematics which investigates the relations, properties, and measurement of solids, surfaces, lines, and angles; the science which treats of the properties and relations of magnitudes; the science of the relations of space.

A hollow globe on the inner surface of which a map of the world is depicted, to be examined by one standing inside.

A thermometer specially constructed for measuring temperetures at a depth below the surface of the ground.

ing bas-reliefs and the like; by extension, a plasterlike or pasty material spread upon a surface to fit it for painting or gilding, or a surface so prepared.

A false image formed in a telescope by reflection from the surfaces of one or more lenses. Ghost moth (Zoöl.), a large European moth (Hepialus humuli); so called from the white color of the male, and the peculiar hovering flight; -- called also great swift. -- Holy Ghost, the Holy Spirit; the Paraclete; the Comforter;…

or structure, to hold other parts in place or bind them together, or to afford a bearing surface; -- usually held or adjusted by means of a wedge, key, or screw. Gib and key, or Gib and cotter (Steam Engine), the fixed wedge or gib, and the driving wedge,key, or cotter, used for tightening the strap which holds the br…

Humped; protuberant; -- said of a surface which presents one or more large elevations. Brande & C.

Swelling by a regular curve or surface; protuberant; convex; as, the moon is gibbous between the half-moon and the full moon. The bones will rise, and make a gibbous member. Wiseman.

Gold in leaf, powder, or liquid, for application to any surface.

The radiating, gill-shaped plates forming the under surface of a mushroom.

Gold, or that which resembles gold, laid on the surface of a thing; gilding. Shak.

Smooth; having a surface without hairs or any unevenness.