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Belonging to the same zone; as, tautozonal planes.

; dark straw yellow for penknives, screw taps, etc.; brown yellow for axes, chisels, and plane irons; yellow tinged with purple for table knives and shears; purple for swords and watch springs; blue for springs and saws; and very pale blue tinged with green, too soft for steel instruments.

Having one fourth the number of planes which are requisite to complete symmetry. -- Te*tar`to*he"dral*ly, adv.

A plane figure having four sides and angles; a quadrangle, as a square, a rhombus, etc.

etrahedron belongs. Tetrahedral angle (Geom.), a solid angle bounded or inclosed by four plane angles.

Having three sides, especially three plane sides; as, a three- sided stem, leaf, petiole, peduncle, scape, or pericarp.

the pilot can exert a turning moment about each of the three rectangular axes of an aëroplane or airship.

earing arranged to receive the thrust or endwise pressure of the screw shaft. -- Thrust plane (Geol.), the surface along which dislocation has taken place in the case of a reversed fault.

A plane surface divided in one direction with lines representing hours and minutes, and in the other with lines representing miles, and having diagonals (usually movable strings) representing the speed and position of various trains.

To rock or roll, as a curved body on a plane.

The handle of a joiner's plane. Knight.

board, turned up at one or both ends, used for coasting down hills or prepared inclined planes; also, a sleigh or sledge, to be drawn by dogs, or by hand, over soft and deep snow. [Written also tobogan, and tarbogan.]

An instrument such as a hammer, saw, plane, file, and the like, used in the manual arts, to facilitate mechanical operations; any instrument used by a craftsman or laborer at his work; an implement; as, the tools of a joiner, smith, shoe-maker, etc.; also, a cutter, chisel, or other part of an instrument or machine tha…

they may be bonded into a continuation of it when the remainder is carried up. Toothing plane, a plane of which the iron is formed into a series of small teeth, for the purpose of roughening surfaces, as of veneers.

ce described by the circumference of a circle revolving about a straight line in its own plane.

on (of a curve) (Geom.), the indefinitely small angle between two consecutive osculating planes of a curve of double curvature. -- Moment of torsion (Mech.) the moment of a pair of equal and opposite couples which tend to twist a body. -- Torsion balance (Physics.), an instrument for estimating very minute forces, as…

g usually in three-sided or six-sided prisms terminated by rhombohedral or scalenohedral planes. Black tourmaline (schorl) is the most common variety, but there are also other varieties, as the blue (indicolite), red (rubellite), also green, brown, and white. The red and green varieties when transparent are valued as j…

The intersection of a plane of projection, or an original plane, with a coordinate plane.

Specifically, the act of drawing a body along a plane by motive power, as the drawing of a carriage by men or horses, the towing of a boat by a tug.

A propeller screw placed in front of the supporting planes of an aëroplane instead of behind them, so that it exerts a pull instead of a push. Hence, Tractor monoplane, Tractor biplane, etc.