A dictionary of architecture and building; biographical, historical and descriptive (1901)
Sturgis, Russell, 1836-1909 · New York, Macmillan · leaf 561
A. Conical (Fig. 9), used in pendentives forreducing a sijuare to an octagon. Frustra ofcones also cover trapezoidal sjjaces. … Fig. 41. B. Couoidal, the smaller base semicircidar,the larger semielliptical (Fig. 10) : rr is the ridgeline.
Architecture
Internet Archive · University of Toronto, Robarts Library · Public Domain Mark 1.0. Free to use for anything.
