shafts with bell caps and square abaci. The central pillars of the smaller arches vary in section. Those in the east part of the nave consist of four shafts united into one (being the same section as those of the clerestory of the choir), while those in the portion of the nave to the west of the centre are composed of two shafts. The shield between the smaller arches is perforated with a small circle. The simple constructional main arches of the triforium are seen on the exterior ([Fig. 372]), where also the corbels to carry the timbers of the roof of the triforium gallery are visible.
Fig. 371.—Jedburgh Abbey. Plan of one half Bay of Clerestory.
The clerestory shafts are of trefoil section both on the exterior and interior ([Fig. 373]), and have foliaged caps of first pointed design. In the interior the caps have the angles of the abaci cut off so as to make them octagonal. The arches are all pointed, and contain first pointed mouldings. A corbel table supports the cornice on the exterior, and there are two small ornamental arches between every two corbels ([Fig. 374]). Over each main pier a small buttress is introduced in the exterior of the clerestory,
Fig. 372.—Jedburgh Abbey. View from North-West.
and a plain standard in the interior. These buttresses are projected on small corbels, and do not rise above the arches. It is thus evident that it was never intended that the central aisle of the nave should be vaulted, there being no suitable buttresses provided to resist the thrust of a vault. The side aisles, however, were vaulted, but the vaults are now demolished, only some fragments of the ribs being left, as shown in Fig. 372.