Practical mechanical drawing and machine design self taught .. (1907)
Westinghouse, Charles. [from old catalog] · Chicago, F. J. Drake & co. · leaf 70
Fig. 150. Fig. 151. increasing the space as the center line is ap-proached, and decreasing the space on the lowerhalf, while increasing the width of the line. Inshading a concave surface, as in Fig. 151, the oper-ation is reversed. Spherical, and other classes ofsurfaces may be represented by this…
Mechanical drawing · Machine design
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