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Encyclopedia Britannica - Main :: PAS-PER |
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PENDENTIVE , the term given in architecture to the bridging across the angles of a square hall
dome or drain. This may be done by corbelling out in the angles, in which case the pendentive may be a portion of a hemisphere of which the half diagonal of the square hall
series of arches across the angle, each ring as it rises advancing in front of the one below .and being carried by it during its construction; in this case the base obtained is octagonal, so that corbels or small pendentives are required for each angle of the octagon, unless as in the church of SS. Sergius and Bacchus at Constantinople a portion of the dome is set back; or again, by a third method, by sinking a semicircular niche in the angle. The first system was that employed in St Sophia
Minor . There is still another method in which the pendentive and cupola are part of the same hemispherical dome, and in this case the ring courses lie in vertical instead of horizontal
Magnesia
Minor , and in the tomb at Valence known as le pendenlif de Valence. The problem is one which has taxed the ingenuity of many builders in ancient times; the bas-reliefs found at Nimrud show that in the 9th century B.C. domes were evidently built over square halls, and must have been carried on pendentives of some kind.End of Article: PENDENTIVE If you wish, you can link directly to this article.
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