Try square
A try square is a woodworking tool used for marking and measuring a piece of wood. The Square refers to the primary use of the tool: measuring the accuracy of a right angle (90 degreess). A piece of wood that is rectangular, flat, and has all edges (faces, sides, and ends) 90 degrees is called four square. A board is often milled four square in preparation for using it in building furniture. A traditional try square has a broad blade made of steel or brass that is riveted to a wooden handle. The inside of the wooden handle typically has a steel or brass strip fixed to it that is precisely 90 degrees to the blade. Some blades have either metric or enlish graduations for measurement.
See also combination square machinist square
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