What is "angle brace"

Angle \An"gle\ ([a^][ng]"g'l), n. [F. angle, L. angulus angle, corner; akin to uncus hook, Gr. 'agky`los bent, crooked, angular, 'a`gkos a bend or hollow, AS. angel hook, fish-hook, G. angel, and F. anchor.]

1. The inclosed space near the point where two lines meet; a corner; a nook.

   Into the utmost angle of the world.
   --Spenser.

   To search the tenderest angles of the heart.
   --Milton.

2. (Geom.)

   1. The figure made by. two lines which meet.

   2. The difference of direction of two lines. In the lines meet, the point of meeting is the vertex of the angle.

3. A projecting or sharp corner; an angular fragment.

   Though but an angle reached him of the stone.
   --Dryden.

4. (Astrol.) A name given to four of the twelve astrological ``houses.'' [Obs.]
   --Chaucer.

5. [AS. angel.] A fishhook; tackle for catching fish, consisting of a line, hook, and bait, with or without a rod. Give me mine angle: we 'll to the river there. --Shak. A fisher next his trembling angle bears. --Pope. Acute angle, one less than a right angle, or less than 90[deg]. Adjacent or Contiguous angles, such as have one leg common to both angles. Alternate angles. See Alternate. Angle bar.

   1. (Carp.) An upright bar at the angle where two faces of a polygonal or bay window meet.
      --Knight.

   2. (Mach.) Same as Angle iron.

      Angle bead (Arch.), a bead worked on or fixed to the angle of any architectural work, esp. for protecting an angle of a wall.

      Angle brace, Angle tie (Carp.), a brace across an interior angle of a wooden frame, forming the hypothenuse and securing the two side pieces together.
      --Knight.

      Angle iron (Mach.), a rolled bar or plate of iron having one or more angles, used for forming the corners, or connecting or sustaining the sides of an iron structure to which it is riveted.

      Angle leaf (Arch.), a detail in the form of a leaf, more or less conventionalized, used to decorate and sometimes to strengthen an angle.

      Angle meter, an instrument for measuring angles, esp. for ascertaining the dip of strata.

      Angle shaft (Arch.), an enriched angle bead, often having a capital or base, or both.

      Curvilineal angle, one formed by two curved lines.

      External angles, angles formed by the sides of any right-lined figure, when the sides are produced or lengthened.

      Facial angle. See under Facial.

      Internal angles, those which are within any right-lined figure.

      Mixtilineal angle, one formed by a right line with a curved line.

      Oblique angle, one acute or obtuse, in opposition to a right angle.

      Obtuse angle, one greater than a right angle, or more than 90[deg].

      Optic angle. See under Optic.

      Rectilineal or Right-lined angle, one formed by two right lines.

      Right angle, one formed by a right line falling on another perpendicularly, or an angle of 90[deg] (measured by a quarter circle).

      Solid angle, the figure formed by the meeting of three or more plane angles at one point.

      Spherical angle, one made by the meeting of two arcs of great circles, which mutually cut one another on the surface of a globe or sphere.

      Visual angle, the angle formed by two rays of light, or two straight lines drawn from the extreme points of an object to the center of the eye.

      For Angles of commutation, draught, incidence, reflection, refraction, position, repose, fraction, see Commutation, Draught, Incidence, Reflection, Refraction, etc.

Brace \Brace\, n. [OF. brace, brasse, the two arms, embrace, fathom, F. brasse fathom, fr. L. bracchia the arms (stretched out), pl. of bracchium arm; cf. Gr. ?.]

1. That which holds anything tightly or supports it firmly; a bandage or a prop.

2. A cord, ligament, or rod, for producing or maintaining tension, as a cord on the side of a drum.

   The little bones of the ear drum do in straining and relaxing it as the braces of the war drum do in that.
   --Derham.

3. The state of being braced or tight; tension.

   The laxness of the tympanum, when it has lost its brace or tension.
   --Holder.

4. (Arch. & Engin.) A piece of material used to transmit, or change the direction of, weight or pressure; any one of the pieces, in a frame or truss, which divide the structure into triangular parts. It may act as a tie, or as a strut, and serves to prevent distortion of the structure, and transverse strains in its members. A boiler brace is a diagonal stay, connecting the head with the shell.

5. (Print.) A vertical curved line connecting two or more words or lines, which are to be taken together; thus, boll, bowl; or, in music, used to connect staves.

6. (Naut.) A rope reeved through a block at the end of a yard, by which the yard is moved horizontally; also, a rudder gudgeon.

7. (Mech.) A curved instrument or handle of iron or wood, for holding and turning bits, etc.; a bitstock.

8. A pair; a couple; as, a brace of ducks; now rarely applied to persons, except familiarly or with some contempt. ``A brace of greyhounds.''
   --Shak.

   He is said to have shot . . . fifty brace of pheasants.
   --Addison.

   A brace of brethren, both bishops, both eminent for learning and religion, now appeared in the church.
   --Fuller.

   But you, my brace of lords.
   --Shak.

9. pl. Straps or bands to sustain trousers; suspenders.

   I embroidered for you a beautiful pair of braces.
   --Thackeray.

10. Harness; warlike preparation. [Obs.]

    For that it stands not in such warlike brace.
    --Shak.

11. Armor for the arm; vantbrace.

12. (Mining) The mouth of a shaft. [Cornwall]

    Angle brace. See under Angle.