| Fig. 317. | Fig. 318. |
To pass on to the simplest form of intersecting or groined vaulting, it is equally clear that columns may be substituted for the square piers which are its normal supports.
Fig. 319.—Crypt under the Church of the Holy Trinity at Caen.
In my theoretical description of this form of vault, I supposed the springers which are next to the wall to rise directly from its face ([Fig. 316]); but in practice it is better that they should rest upon projecting piers; and it is obvious that for these pilasters or columns may be substituted. The crypt under the Church of the Holy Trinity at Caen is a good example of this class of vaulting ([Fig. 319]). When we apply the transverse rib to this vaulting, we give it at once a strictly architectural character, as every compartment is now distinctly defined (Figs. [320], [321]).
