A dictionary of architecture and building; biographical, historical and descriptive (1901)
Sturgis, Russell, 1836-1909 · New York, Macmillan · leaf 555
Fig C. In the form shown in Fig. 11, the basesare as in Fig. 10, and the elements of the sur-face at the springing are straight lines parallelto the axis, but the ridge is curved, the expan-sion being in a vertical direction only. The948 VAULT surface, not being generated by the movementof any… … Fig. 43. but such vaults may be termed convex-conoidal.They rarely occur except as i)arts of a com])oundyault.
Architecture
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