Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 112
Fig. 9a … PERSPECTIVE DRAWING. 17 SP^ and a^ crosses HPP. The vertical projection of this inter-section must be vertically in line with this point, and on the linedrawn between SP^ and a\ and hence at 9n^. Since the verticalprojection of the intersection coincides with the intersectionitself, a^ (coincident…
Architecture · Building
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