A dictionary of architecture and building; biographical, historical and descriptive (1901)
Sturgis, Russell, 1836-1909 · New York, Macmillan · leaf 561
faces, usually, and run spirally. An annular vault (Fig. 7) is a barrel vaultwith a curved axis. Its intrados is a portion ofthe surface of a cylindrical ring. An annularvault may also be used with its axis in a verti-cal plane (Fig. 8). \ spiral vault may he described a.s an annularvault with a… … A. Conical (Fig. 9), used in pendentives forreducing a sijuare to an octagon. Frustra ofcones also cover trapezoidal sjjaces.
Architecture
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