Gothic architecture in France, England, and Italy . 9&dg£,D J&nqhiubLnat oe- Fig. io. in between them, possessing, however, owing to itsarched form an independent strength of its own. The system of constructing vaults on the new systemis explained by Fig. io where one bay is shown with theskeleton of ribs only and others with the panel filled in. CH. Ill] THE GOTHIC VAULT 37 One advantage of the new construction was that it Economydispensed with a great part of the centering required for ingthe Roman vault. To construct a vault without ribs itis necessary to form centering under the whole surf
Gothic architecture in France, England, and Italy . 9&dg£,D J&nqhiubLnat oe- Fig. io. in between them, possessing, however, owing to itsarched form an independent strength of its own. The system of constructing vaults on the new systemis explained by Fig. io where one bay is shown with theskeleton of ribs only and others with the panel filled in. CH. Ill] THE GOTHIC VAULT 37 One advantage of the new construction was that it Economydispensed with a great part of the centering required for ingthe Roman vault. To construct a vault without ribs itis necessary to form centering under the whole surface :framed centres must be put in the line of the groins andthe transverse arches, with others between, on whichlagging of planking or slats is laid to receive thevault of stone, brick, or concrete. But in ribbed vaultingcentering is only necessary under the ribs, and theashlaring of the panel can be filled in, course by course,on a moveable piece of wood resting on the centering ofthe ribs and shifted as soon as each course is Fig. ii. It is of course obvious that the ribs may be made to Doublecontribute largely to the strength of the vault, especially of ribswhen laid under the diagonal groin, and above all whenthere is much winding in the panel. The transverseribs might often be safely omitted, and in fact are so ineach alternate articulation at Durham. But in manycases the purpose fulfilled by the rib is really more thatof acting as a centre, by giving a true arched line, thanthat of support. Often the rib was not bonded to the Thefilling in, as it should be, by a web on the back (Fig. 11 a) ^but simply laid under the ashlaring as in Fig. 11 b. Itis so in De Lucys retro-choir at Winchester where the ribsadd but little to the strength of the vault. It is so also 38 THE GOTHIC VAULT [CH. Ill The webbedrib Windingof surfaces in the vault at Lincoln where in one case the rib hassunk away leaving the ashlar vault standing without one of the great cross-vaults
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Keywords: ., bookauthorjacksont, bookcentury1900, bookdecade1910, bookyear1915
