CONE.—A solid body or figure having a circle for its base, and its top terminated in a point or vertex.
CONSTRUCTION.—The making of any object.
CONTOUR.—The outline of the general appearance of an object.
CONVERGENCE.—Lines extending towards a common point.
CONVEX.—Rising or swelling into a round form—the opposite to concave.
CORNER.—The point of meeting of the edges of a solid, or the two sides of a plane figure.
CROSS-HATCHES.—In free-hand drawing the use of lines crossing each other to produce light and shade effects.
CURVE.—A line of which no part is straight.
Reversed Curve.—One whose curvature is first in one direction and then in the opposite direction.
Spiral Curve.—A plain curve which winds about and recedes, according to some law, from its point of beginning, which is called its center.