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II
GOTHIC CONSTRUCTION IN FRANCE
73
on very low arches, are more acutely pointed; even the diagonal ribs having the pointed form. The stilting of the longitudinal rib is still more marked in these vaults; its
FIG. 37.
springing being more than half the vertical height of the vault above the springing of the great ribs, and the principle of concentrated thrusts upon the pier is therefore more distinctly emphasised (Fig. 37). The lower piers are alternately round columns with engaged octagonal shafts,
