Practical mechanical drawing and machine design self taught .. (1907)
Westinghouse, Charles. [from old catalog] · Chicago, F. J. Drake & co. · leaf 16
g. 16—Triangular Scale. fine line in contact with this edge, then reversethe triangle and move the vertical edge towardsthe line. If the vertical edge of the triangle andthe line coincide the angle is 90°. If they do notcoincide, and the vertex of the angle formed by DRAFTING TOOLS 13 the line and… … Fig. 17—French Curves. Scales. The best and most convenient form ofscale for general use is that shown in Fig. 15. An-other form of scale which is very commonly usedis shown in Fig. 16, The ordinary length of a scale is 12 inchesi, not counting the small portionat each end, which is undivided, and…
Mechanical drawing · Machine design
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