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which the cathode rays are focused upon the anticathode, for intensifying the effect. -- Principal, or Solar, focus (Opt.), the focus for parallel rays.

The anterior of the three principal divisions of the brain, including the prosencephalon and thalamencephalon. Sometimes restricted to the prosencephalon only. See Brain.

two half bastions. -- Front door, the door in the front wall of a building, usually the principal entrance. -- Front of fortification, the works constructed upon any one side of a polygon. Farrow. -- Front of operations, all that part of the field of operations in front of the successive positions occupied by the a…

of resources (as by a pledge of revenue from customs) for discharging the interest of or principal of; as, to fund government notes.

Providing a fund for the payment of the interest or principal of a debt.

A mineral of a nearly black color and vitreous luster, and consisting principally of the silicates of yttrium, cerium, and iron.

Lead sulphide; the principal ore of lead. It is of a bluish gray color and metallic luster, and is cubic in crystallization and cleavage. False galena. See Blende.

The principal sound or sounds by which others are produced; the fundamental note or root of the common chord; -- called also generating tone.

th as a known quantity or a known relation, or as a premise from which to reason; -- used principally in the passive form given.

n erected perpendicularly to the horizon, formerly used in astronomocal observations. Its principal use was to find the altitude of the sun by measuring the length of its shadow.

of the sphere, in which the point of sight is taken at the center of the sphere, and the principal plane is tangent to the surface of the sphere. "The gnomonic projection derives its name from the connection between the methods of describing it and those for the construction of a gnomon or dial." Cyc. of Arts & Scienc…

One of the principal divisions of Alcyonaria, including those forms which have a firm and usually branched axis, covered with a porous crust, or c

Of large size or extent; great; extensive; hence, relatively great; greatest; chief; principal; as, a grand mountain; a grand army; a grand mistake. "Our grand foe, Satan." Milton. Making so bold . . . to unseal Their grand commission. Shak.

Holding a chief position; elevated: lofty: eminent; distingushed; formost; principal; as, great men; the great seal; the great marshal, etc. He doth object I am too great of birth. Shak.

mmer-beam truss, which is so framed as not to have a tiebeam at the top of the wall. Each principal has two hammer-beams, which occupy the situation, and to some extent serve the purpose, of a tiebeam.

Secondary and less distinct tones which accompany any principal, and apparently simple, tone, as the octave, the twelfth, the fifteenth, and the seventeenth. The name is also applied to the artificial tones produced by a string or column of air, when the impulse given to it suffices only to make a part of the string or…

The product or result of any exertion or labor; gain; reward. The pope's principal harvest was in the jubilee. Fuller. The harvest of a quiet eye. Wordsworth. Harvest fish (Zoöl.), a marine fish of the Southern United States (Stromateus alepidotus); -- called whiting in Virginia. Also applied to the dollar fish. -- Ha…

Principal; chief; leading; first; as, the head master of a school; the head man of a tribe; a head chorister; a head cook.

A part (usually separate from the bed or frame) for supporting some of the principal working parts of a machine; as:

The principal stone in a foundation; the chief or corner stone. Ps. cxviii. 22.