Blessing, George F. (George Frederick), 1875-1921, Darling, Lewis A. (Lewis Andrew) · New York, J. Wiley & sons; [etc., etc.] · leaf 32
h to be easily handled and hard enough tohold its edge under use. Triangles are made of wood, rubber,amber, celluloid, or metal. Metal triangles are accurate anddurable, but are difficult to handle, and if dropped on a drawingthe corners puncture the surface. Those made of wood arecheap and light… … (a) 45° Triangle. (b) 60° Triangle. Fig. 5. — Ordinary Triangles. and are to be preferred. An additional advantage is that, dueto their transparency, the draftsman is enabled to see workalready completed although it may be covered with the triangle.The triangles most generally used are the 45° [see…
Mechanical drawing
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