A dictionary of architecture and building; biographical, historical and descriptive (1901)
Sturgis, Russell, 1836-1909 · New York, Macmillan · leaf 562
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. The94S VAULT surface, not being gtuenitod by tlie movementof any line,… … Fig. 43. but such vaults may be termed coiivex-conoidal.They rarely occur exce[)t a.s parts of a coni]iouudvault.
Architecture
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