trialogue (trialog)

[ trial-piece (trī'al-pēs), n. 1. A specimen of any aggregate; a sample taken from a ma , or one of the first productions of some proce , by which to determine the quality or character of the rest. IMG:content-0840.png:[blocks in formation] square. rectilinear figure of this description. The lines measured in the shortest way from vertex to vertex are called the sides of the triangle. The angles between the sides at the vertices measured so that each subtends a side are called the angles of the triangle. 2. Any three-cornered or three-sided figure, body, or arrangement; anything having a triangular form or bounding a three-sided space. Triangle - space between the Lines of Head, Life, and Fate, or Health. K. St. Hill, Grammar of Palmistry, vii. The older "vowel triangles " from which the trigram is adopted. Encyc. Brit., XXII. 385. 3. A musical instrument of percu ion, made of a rod of polished steel bent into the form of a triangle, and open at one of its angles. It is sounded by being struck with a small steel rod. It is frequently used in modern orchestral music for brilliant and sparkling effects. 4. [ cap. ] In astron, same as Triangulum.-5. Eccles., a symbol of the Trinity. The equilateral triangle, as symbolizing the Trinity, is of frequent occurrence, in various combinations, in Christian ornament. 6. A chest made in triangular form to hold a priest's cope. [Archaic.]-7. A three-cornered straight-edge, with one right angle and the other angles more or le acute, used in conjunction with the T-square for drawing parallel, perpendicular, or diagonal lines.-8. A kind of gin for raising heavy weights, formed by three spars joined at top. See gin4, 2 (c).-9. Milit., formerly, in the British army, a sort of frame formed of three halberds stuck in the ground and united at the top, to which soldiers were bound to be flogged: generally in the plural.10. In ceram., a form of the stilt consisting of three metal pins held together in the form of a triangle. See stilt, 5.-11. One of certain tortricid moths: an English collectors' name. Tortrix rufana is the red triangle. Samouelle. -12. In entom., a large three-sided cell found in the wings of many dragon-flies. It lies near the middle of the basal half of the wing, and its form and relations to the other cells, both of the anterior and posterior wings, are of much value in cla ification. It is of ten called the discoidal triangle, to distinguish it from the internal triangle, which adjoins it on the inner side, and the anal triangle, which lies close to the anal border of the wing. Altitude of a triangle, the perpendicular distance of any vertex to the opposite side considered as the base. Annex triangle, one of three triangles derived from a primitive triangle ABC. Three points L, M, N are so taken that the triangles LBC, AMC, ABN are all perverted equals of ABC; then, taking A' at the intersection of BN and MC, B' at the intersection of CL and NA, and C' at the intersection of AM and LB, the triangles A'BC,