. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. ach got out of a , as in later structures. The back of tliese ribs is concentric with the soffite. Thetransverse rib of the north-east transept of Canterbury Cathedral consists of about onehundred richly-moulded stones, but the workmanship is exceedingly rude iOOSy. The rough construction of the spandril, in the early instances, was followed atonce by a more artificial structure, bespeaking a great advance in the art of masonry ;and it r
. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. ach got out of a , as in later structures. The back of tliese ribs is concentric with the soffite. Thetransverse rib of the north-east transept of Canterbury Cathedral consists of about onehundred richly-moulded stones, but the workmanship is exceedingly rude iOOSy. The rough construction of the spandril, in the early instances, was followed atonce by a more artificial structure, bespeaking a great advance in the art of masonry ;and it remained with very slight change to the very latest period of rib-vaulting. Thissystem is shown in fig. (iGiid. The junction of the solid mass L to N with the clearstorywall, is bounded by parallel vertical lines D, and this mass is always built of solidmasonry bonded into the wall and forming part of it; the French name for this block ofmasonry is tas de charge. It is from the level of N that the real rib and panel workuf ibe vault begins, for separate ribs are erected upon the surface of this solidi and 608 TIIEOUY or ARCHITECTURE. huOK IL. coiiiiocted by vaults of a light material. Tlie dcconitive construction, however, of the vault, cxiiibiistlie rib and panel from the abacus L, upwards. Tlie point N is commonly at abont : half tiie vertical hei<^ht of the arch, iind is not J necessarily guided by the impost of any clear- siory lib adjoining. M is the general position where the mouldings of the several ribs run clear of one anotlier at the divergence of tlie ribs. The solid i)art LM is built of horizontal courses of masonry, generally each of a single stone and its level Ijeds cut the curved mouldings obliquely in front. 2002^. Moller, Memorials, &c., translation1S36, p. 154, notices that, at Cologne, thelower part of the vaulting of the cathedral isformed by horizontal courses of stone pro-jecting from the wall, consequently the ac-lual span of the vaulting is ])roportio
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