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TRIPARTITION, (from the Latin tres, three, and pars,a part,) the division of a number by three.
TRIPOD, or Tripos, (from rpeic, three, and ires, a foot,)in antiquity, a three-legged seat from which the priestsdelivered their oracles.
TRIPTIC, or Triptych , a tablet in three divisions, ofwhich the two outer fold over the centre one, by means\ of hinges, and form a cover to it. Tripties are employed toadorn the altars of churches over which they are placed ;when open, they exhibit a painting, or representation, of somesacred subject.
TRISECTION, (from the Latin tres, three, and seco, tocut,) the division of anything into three equal parts ; as thetrisection of an angle, &c.
TROCHILUS, (from rpoxoQ, a wheel,) an annular mould-ing, of which, the section through the axis of the column isconcave ; more commonly denominated scotia. Its situationis generally between two tori. See Scotia, and Mouldings.
TROCHOID, (from rpox<>s, a wheel, and tiSoe, shape,) afigure described by rolling a circle upon a straight line, witha pin or point in the circumference upon a fixed plane, in,or parallel to, the plane of the moving circle. See Cycloid.
TROPHY , (rpoiraiov, from rpom), to put an enemy to flight,)in architecture, an ornament representing the trunk of a tree,j charged around its circumference with military weapons,
! colours, and instruments of music.
| TROUGH, (from the Saxon troh,) a vessel in the form ofa rectangular prism, open on the top, having five sides! enclosed for holding water.
Trough-Gutter, a gutter in the form of a trough, placedbelow the dripping eaves of a house, in order to convey thewater from the roof to the vertical trunk, or pipe, by whichit is discharged. They are only used in common buildingsand out-houses. In buildings of the better class, the water-way is formed behind a blocking-course.
TROWEL. See Tools.
Trowel-point, a method of enrichment, applied to somemouldings of Norman and Byzantine character, such as togive them the appearance of having been indented with thepoint of a trowel.
TRUGG, a tray to carry mortar in.
TRUNCATED, (from the Latin trunco, to cut short,)signifies that quality of a solid by which the upper portionis cut off parallel to the base of the solid. Thus the frustumof a pyramid, cone, sphere, &c., is said to be truncated.
Truncated Cone , one which has the upper part cut off;the frustum of a cone. See Cone .
Truncated Pyramid, one which has the upper part cutoff; the frustum of a pyramid,
TRUNK, (from the French trompe, a long tube,) a vesselopen at each end for the discharge of water, rain, &c.
Trunk, (from the Latin truncus, the body of a tree,) thatpart of a pilaster which is contained between the base andthe capital.
TRUSS, (from the French trousse,) a frame of timbers sodisposed, that if suspended at two given points, and chargedwith one or more weights in certain others, no timber wouldpress transversely upon another, except by timbers exertingequal and opposite forces.
When one or more exterior timbers of a frame, suspendedfrom two given points, are propped by the disposition ofinterior timbers at certain points in each of the exteriorpieces, so as to resist the pressures of several weights, eachacting upon one of the said points, without any tendency tobend or break any timber employed in the construction ; theframe is called a truss, and each of the exterior timbers sopropped in their length, are said to be trussed.
description it is always the lowest; a beam extenu“’o^j e( j 9the tie-beam, between a pair of principal rafters, is wh 1<3 ^collar-beam, or simply a collar, or straining f ecir ^ e u ppe rname indicates its use ; when a beam terminates ^part of a truss, it is called a camber-beam, because 1 toffa rd 9to slope in a small degree both ways from its midd e ^ ye tb®each extreme on the upper edge; beams placed a
VI V.11UO U« HAV WAV/ v-wv. 2 - # *
crown-post in a truss, but one or more pairs o q’jiethe pair next the middle are called queen-p oS ^ j n denexed Plate shows the various parts of a tru tog e ^’together with various methods of connecting t ie