Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 126
B D E Fig. 4. … straignz line is perpendicular to either Vor H^ its projection onthat plane is a point, and on the other plane is a line equal inlength to the line itself and perpendicular to the ground line. Fig. 4 is given as an exercise to hel^j to show clearly the ideaDf x^lan and elevation. A = a point B…
Architecture · Building · Carpentry
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