Page:Charles Moore--Development and Character of Gothic Architecture.djvu/195

Rh aisle of this church, for instance, is vaulted with round arched quadripartite vaults in square compartments, each compartment embracing two bays of the side aisles, in  accordance with the form that had been established in Lombardy. These vaults have transverse ribs of square section, but they have no groin ribs. The piers are square in section, and have single engaged shafts which start from the pavement, and which, in the main piers, carry the transverse ribs, and in the intermediate piers carry the first order of the lower clerestory arches. In each double bay there are two large clerestory windows, the crowns of whose arches rise very little above the springing of the vaults, and thus a wide space of wall is left between them and the arch of the vault, while high up in the middle of this wall is a third but very small window. There are no triforium openings, and the aisles are lighted by small windows high in their walls. Fig. 93, a geometric elevation of one bay, will illustrate the internal structure of this church. There is an apse at each end of the building—an arrangement peculiar to Germany—covered with a semi-dome; and at the crossing of the nave and transept is an octagonal dome on pendentives.

In the Cathedral of Bamberg, built near the end of the twelfth century, the vaults assume the pointed form, and are provided with light groin ribs. They are still, however, in square compartments—one bay of the nave (Fig. 94) embracing two bays of the aisles. The ground-story arches