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of the horizon. -- Prime-vertical dial, a dial in which the shadow is projected on the plane of the prime vertical. -- Prime-vertical transit instrument, a transit instrument the telescope of which revolves in the plane of the prime vertical, -- used for observing the transit of stars over this circle.…

(Spherical Projection), the circle cut from the sphere to be projected, by the primitive plane. -- Primitive colors (Paint.), primary colors. See under Color. -- Primitive Fathers (Eccl.), the acknowledged Christian writers who flourished before the Council of Nice, A. D. 325. Shipley. -- Primitive groove (Anat.), a…

e, the motion of which was supposed to carry with it all the inclosed spheres with their planets in a daily revolution from east to west. See Crystalline heavens, under Crystalline. The motions of the greatest persons in a government ought to be, as the motions of the planets, under primum mobile. Bacon.…

under Axis. -- Principal axes of a quadric (Geom.), three lines in which the principal planes of the solid intersect two and two, as in an ellipsoid. -- Principal challenge. (Law) See under Challenge. -- Principal plane. See Plane of projection (a), under Plane. -- Principal of a quadric (Geom.), three planes each…

A solid whose bases or ends are any similar, equal, and parallel plane figures, and whose sides are parallelograms.

the like; -- sometimes with on, upon, into, etc.; as, to project a line or point upon a plane. See Projection, 4.

ething; delineation; plan; especially, the representation of any object on a perspective plane, or such a delineation as would result were the chief points of the object thrown forward upon the 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…

Same as Purslane.

Purslane. [Colloq. U. S]

A solid figure contained by a plane rectilineal figure as base and several triangles which have a common vertex and whose bases are sides of the base.

ean proposition (Geom.), the theorem that the square described upon the hypothenuse of a plane right-angled triangle is equal to the sum of the squares described upon the other two sides. -- Pythagorean system (Astron.), the commonly received system of astronomy, first taught by Pythagoras, and afterward revived by Co…

er and lower half, of which the former acts as a kind of lid, as in the pimpernel and purslane.

A plane figure having four angles, and consequently four sides; any figure having four angles.

One of the four parts into which a plane is divided by the coördinate axes. The upper right-hand part is the first quadrant; the upper left-hand part the second; the lower left-hand part the third; and the lower right-hand part the fourth quadrant.

A plane surface with four equal sides and four right angles; a square; hence, figuratively, anything having the outline of a square. At which command, the powers militant That stood for heaven, in mighty quadrate joined. Milton.

A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines.

A flat file having the handle at one side, so as to be used like a plane.

At right angles, as the cranks of a locomotive, which are in planes forming a right angle with each other.

The position of planets when distant from each other five signs, or 150º. Hutton.

A plane figure with fifteen angles, and consequently fifteen sides.