Identifier: byzantineromanes131jack (find matches)
Title: Byzantine and Romanesque architecture
Year: 1913 (1910s)
Authors: Jackson, Thomas Graham, Sir, 1835-1924
Subjects: Architecture, Byzantine Architecture, Romanesque
Publisher: Cambridge (Eng.) University press
Contributing Library: Wellesley College Library
Digitizing Sponsor: Boston Library Consortium Member Libraries

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4 I I ^ ^^ Fig. 24. flying buttresses; and their strength depends on theirabutment, which is the stair turret and the short respondwalls of the gallery arches. Strange to say removal ofplaster for the purpose of examination has revealed the
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cH.vi) S. SOPHIA, CONSTANTINOPLE 93 fact that in one case at all events the stair turret was not Thebonded to the rest, but was separated by a clear joint\Should this be the case throughout it constitutes astructural defect. The aisles and galleries are both vaulted, the middle The vaultsbays with the Roman cross-vault, the angle bays withthe pseudo-dome of Galla Placidias mausoleum (Fig. 10,No. 2, p. 39). Their thrust laterally is taken by barrelvaults forming arches parallel to the nave and side walls,which relieve the outside walls on one hand, and thenave arcades on the other from all pressure. The stability therefore of the whole structure dependson the four great piers, and the stability of the piers onthat of the exterior buttresses; and the construction ina measure anticipates that equilibrium of forces whichwas the principle of Gothic art some centuries later. The exterior (Plate XII), like that of most Byzantine Exteriorchurches, seems to have been little studied. It is now

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