The 'T-Square' System

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The 'T-Square' System

A T-square is a technical drawing instrument primarily a guide for drawing horizontal lines on a drafting table. It is used by draftsmen. It is also used to guide the triangle that draws vertical lines. Its name comes from the general shape of the instrument where the horizontal member of the T slides on the side of the drafting table. Common lengths are 18", 24", 30", 36" and 42". [via wikipedia]

Thanks to indiewrench for the photo.