Adjustable Drafting T-Square
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A T-shaped ruler, used primarily in mechanical drawing, having a short crosspiece that slides along the edge of the drawing board as a guide to the perpendicular longer section in making parallel lines, right angles, etc., and as a support for triangles.
Galleries
Mechanical Drawing ToolsSource
Government Printing Office Official Gazette (Washingon, DC: Government Printing Office, 1912)
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