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Tri′an-gle.


1. (Music.) An equilateral bar of steel suspended by one angle and having an opening at one of the lower angles, so that the legs are of unequal length. It is struck with a small rod, and is sometimes introduced in brilliant musical passages.

Trial-square.

Possibly the shalisbim of the Hebrew Scriptures.

The triangulum of the Romans. They had several forms of metallic instruments of percussion; the cymbalum plates, used in pairs; kymbala of the Greeks; the crotala and crusmata, kinds of castanets; krotala of the Greeks; the sistrum, which had jingling rods; the tintinnabula, or bells in a frame; the crepitaculum, a hoop with rings. See list of percussion-instrument on page 1501, and under each head there noted.

Triangles.


2. (Drafting.) A threecor-nered straight-edge, used in conjunction with the T-square for drawing parallel, perpendicular, or diagonal lines. It has one right angle, the two others being each of 45° (b), or one of 30° and the other of 60° (a).


3. (Building, etc.) A gin formed by three spars. A staging of three spars.


4. (Pottery.) A small piece of pottery, placed between pieces of biscuit ware in the seggar, to prevent the adherence of the pieces when fired.

5. A frame of three halberds to which a person is (was) lashed to undergo military punishment.

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1501 AD (1)
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