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Appleton's cyclopædia of drawing, designed as a textbook for the mechanic, architect, engineer, and surveyor (1866)

Worthen, William Ezra, 1819-1897, [from old catalog] ed, Appleton, firm, publishers, New York. (1866. D. Appleton & co.) [from old catalog] · New York, D. Appleton and company · leaf 397

An illustration from Appleton's cyclopædia of drawing, designed as a textbook for the mechanic, architect, engineer, and surveyor, 1866, leaf 397
ramid,its horizontal section at every level being square. Xow the later archi-tects converted this section into a circle, the four-sided 2:)yramid became aconoid, and all the ribs forming the conoidal surface became alike in cur- 266 AECHITECTUEAL DEAWING. … vature, so that they all miglit be made simple circular arcs; these ribsare continued with unaltered curvature till thej meet and form theridge; but in this case the ridges are not level, but gradually descend every way from the centre point (fig. 98): In the figure this is not fully carried…

Mechanical drawing · Architectural drawing · Projection · Perspective

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