Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 29
nd for this determination a thirdblade must be used and triedwith the two given T-squares successively. Triangles. Triangles are made of various substances such aswood, rubber, celluloid, and steel. Wooden triangles are cheap butare likely to warp out of shape; rubber triangles are frequently… … Fig. 8. Testing the Edge of T-Square
Architecture · Building
Internet Archive · Kelly Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
