A dictionary of architecture and building : biographical, historical, and descriptive (1902)
Sturgis, Russell, 1836-1909 · New York : The Macmillan company · leaf 559
Fig. 41. B. Conoidal, the smaller base semicircular,the larger semielliptical (Fig. 10); rr is the ridgeline. … Fig. 42. C. In the form shown in Fig. 11, the basesare as in Fig. 10, and the element.s 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…
Architecture · Architects
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