Chambers's encyclopædia; a dictionary of universal knowledge . Fig. 2. tunnel-vaulting were found very gloomy and ill-lighted, it was desirable that simdar intersectingvaults should be used to cover the main roof, inorder to admit windows raised to light the vault-ing. But how was this to be managed with thesmall materials at command? If the transverse arches AB, CD (fig. 3) are semicircular, and theside-arches AC, BD the same—the vault beingformed by two intersecting cyhnders—then the. Fig. 3. intersecting groins AD and CB must be was a difficult foi-m of constniction: themedi
Chambers's encyclopædia; a dictionary of universal knowledge . Fig. 2. tunnel-vaulting were found very gloomy and ill-lighted, it was desirable that simdar intersectingvaults should be used to cover the main roof, inorder to admit windows raised to light the vault-ing. But how was this to be managed with thesmall materials at command? If the transverse arches AB, CD (fig. 3) are semicircular, and theside-arches AC, BD the same—the vault beingformed by two intersecting cyhnders—then the. Fig. 3. intersecting groins AD and CB must be was a difficult foi-m of constniction: themedieval builders found it easier to construct semi-circular groin arches with radius EA (fig. 4), and tofill in the triangular spaces ABE, &c., with slightlj-domed vaidts. Here, then, we have the origin ofthe groin-rib, the development of which playedso important a part in Gothic vaulting. When thespace to be covered was square, this form of vaidtwas found to answer, and usually included two baysof the side-aisles. But this arrangement lookedawkward externally, the windows of the cleres-tory not grouping well with those of the side-aisles. A transverse arch (a, a, fig. 4) was then
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Keywords: ., bookcentury1800, bookdecade1860, bookpublisherlondo, bookyear1868
