Ambulatory Vaults which Include the Radiating Chapels
In all the churches thus far discussed, and, in fact, in the majority of those constructed during the Gothic period, the radiating chapels are separated from the rest of the ambulatory by arches directly across their entrances. But quite frequently these chapels, particularly when they were comparatively shallow, as in the cathedral of Chartres ([Plate III-g.]), or
Fig. 84.—Auxerre, Cathedral.
even when comparatively deep as at Saint Denis[439] and Saint Maclou at Pontoise ([Plate III-h.]), were treated as part of the ambulatory and an added rib was introduced in vaulting them exactly in the manner described in connection with the trapezoidal bays of Rouen and Coutances. Furthermore, as the chapels were increased in size, more than one extra rib was added in the severy of the trapezoidal vault which embraced them so that there were, sometimes, two such ribs, as in the cathedral of Tournai (1240-1260) [(Fig. 85)].[440] Occasionally, also, as in the cathedral of Saint Quentin (after 1230) ([Plate III-i.]), similar bays and vaults occur, with the addition of large radiating chapels opening off of the more shallow curves of the ambulatory bays, suggesting a combination of the Tournai type with that of Auxerre ([Plate III-f.]). In some of the larger and deeper chapels there were even four added ribs as, for example, in the cathedral