A dictionary of architecture and building : biographical, historical, and descriptive (1902)
Sturgis, Russell, 1836-1909 · New York : The Macmillan company · leaf 565
he fir.st .step in the development of the ribsystem of vaulting is often said to be the in-crease of the depth of the cross band in barrelvaults, making it an independent arch, withthe vaulting above it. But such a rib, if it isproperly so called, does not .sustain the vault,which would stand just… … Fio. 72. ning of tlic rib .system will doubtless In fciuiidin the substitution of a sc|iiare-cornerecl archfor the groin stones of a solid compound vault,as in Fig. 42, from S. Ainbrogio, Milan. This959 VAULT is a great advance in ease of construction. Theshaping of groin stones is quite a problem…
Architecture · Architects
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