Gothic architecture in France, England, and Italy . ry. load To these elementary principles,— 1st, concentration of particularthrusts and supports and consequent articulation of the SFSShicbuilding; 2nd, subordination of orders; 3rd, freedomof vaulting arches and use of vaulting ribs, and 4thcorrespondence between members of arch and load,most if not all the subsequent developments of Gothic 30 THE GOTHIC VAULT [ch. ii architecture may be more or less directly referred. Theconstruction of this single Romanesque church has beenexplained at some length, because if the reader has oncemastered it
Gothic architecture in France, England, and Italy . ry. load To these elementary principles,— 1st, concentration of particularthrusts and supports and consequent articulation of the SFSShicbuilding; 2nd, subordination of orders; 3rd, freedomof vaulting arches and use of vaulting ribs, and 4thcorrespondence between members of arch and load,most if not all the subsequent developments of Gothic 30 THE GOTHIC VAULT [ch. ii architecture may be more or less directly referred. Theconstruction of this single Romanesque church has beenexplained at some length, because if the reader has oncemastered it he will have a key to the full understandingof the later and more intricate problems of Gothicconstruction. CHAPTER III THE GOTHIC VAULT {continued) The scheme of S. Ambrogio is logical and complete Limita-tion of so far as it goes : but it requires that all the bays shall squ vaubay be square, and it was not always convenient or even v possible to make square bays in the nave, occupyingtwo of those in the aisle. The difficulty of cross-vaulting. Fig. 7-an oblong bay had still to be encountered, and also thatof raising the nave vaults high enough for a clerestory. An oblong bay is shown in Fig. 7. The lines AB Difficultyand DC represent the transverse arches dividing the an oblongbays: AD is the wall-arch: and AC and BD are the 32 THE GOTHIC VAULT [CH. Ill The Welsh groin diagonal groins. On each base line is set up its arch,which in early work would of course be will be seen at once that it is no easy matter to forma cross-vault with three arches so different in the transverse and diagonal arches the differenceis not too great to be got over by making the vaultdomical: but the cross-vault generated by the wall-archis more difficult to deal with. We might of course carrythis half-cylinder horizontally to intersect the main vault,making what is called a Welsh or coal-scuttle vault The groinat Vezelay
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