A dictionary of architecture and building; biographical, historical and descriptive (1901)
Sturgis, Russell, 1836-1909 · New York, Macmillan · leaf 74
a pointabove the springing line of its supjjorting arches,in which case its surface is part of a spherewhose diameter is greater than the diagonal ofthe square. It may also start from a line or asmall circular arc, instead of a point, the cor-ners of the square being cut off, as often occursin… … PLAN Pendentive, Fig. 5. but a triangle or a polygon of any number ofsides, or a rectangle, and examples of hexago-nal, octagonal, and sixteen sided occur. Thereis a peculiar form. Fig. 5, in the baths of Cara-calla, Rome, in the angles of an octagon, facedwith brick, and doubtless once plastered…
Architecture
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