same level. Theshell of the vault, therefore,between these ribs was no regulargeometric surface, but simply suchas might have been formed bylaths laid across from rib to rib.This shell is often no more thansix inches thick, while Roman _ Compartment of the simplest GothioVaults Of the Same Span… … 216 HISTORY AND RUDIMENTS made their vwalt-swrfaces geometrically regular, and left thegroins to take their chance ; while the early Freemasonsmade their groins (i. e., ribs) geometrically regular, and letthe intermediate surfaces take their chance. This was a vastimprovement both in construction…
Architecture · Building
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