Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 28
TRIANGLES. is hung up when not in use ; when allowed to lie on the drawingboard with a pencil or an eraser under one corner it will becomewarped in a short time, especially if the room is hot or the sunhappens to strike the triangle. Triangles are made in various sizes, and many draftsmenhave…
Architecture · Building · Carpentry
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