T Square

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T square [′tē ‚skwer]

(graphic arts)

A straightedge rule with a crosspiece at one end by which parallel lines are drawn perpendicular to the edge of the drawing board.

T Square

a drafting ruler with a crosspiece, or head, at one end. T squares may have a double-plane head and a ruler length of 800 to 1,400 mm or a single-plane head and a ruler length of 500 to 750 mm. When used in drafting, the head is pressed against the edge of the drawing board. A T square makes it possible to draw parallel lines with a deviation of no more than 1 mm per 1,000 mm of length. The drawing edge of single-plane T squares is set at an angle of 90° to the head. T squares with a double-plane head make it possible to draw lines inclined at any angle. T squares are usually made of hard wood.

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