A dictionary of architecture and building : biographical, historical, and descriptive (1902)
Sturgis, Russell, 1836-1909 · New York : The Macmillan company · leaf 559
Fig. 40. A. Conical (Fig. 9), used in pendentives forreducing a square to an octagon. Frustra ofcones also cover trapezoidal spaces. … Fig. 41. B. Conoidal, the smaller base semicircular,the larger semielliptical (Fig. 10); rr is the ridgeline.
Architecture · Architects
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