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PENDENTIVE

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Originally appearing in Volume V21, Page 87 of the 1911 Encyclopedia Britannica.
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PENDENTIVE , the See also:

term given in See also:architecture to the bridging across the angles of a square See also:hall, so as to obtain a circular See also:base for a See also:dome or drain. This may be done by corbelling out in the angles, in which See also:case the pendentive may be a portion of a hemisphere of which the See also:half See also:diagonal of the square hall is the See also:radius; or by throwing a See also:series of See also:arches across the See also:angle, each See also: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 See also:church of SS. See also:Sergius and Bacchus at See also:Constantinople a portion of the dome is set back; or again, by a third method, by sinking a semicircular See also:niche in the angle. The first See also:system was that employed in St See also:Sophia at Constantinople, and in See also:Byzantine churches generally, also in the domed churches of See also:Perigord and See also:Aquitaine. The second is found in the See also:Sassanian palaces of Serbistan and See also:Firuzabad, and in See also:medieval architecture in See also:England, See also:France and See also:Germany, where the arches are termed " squinches." The third system is found in the See also:mosque at See also:Damascus, and was often adopted in the churches in See also:Asia See also:Minor. There is still another method in which the pendentive and See also:cupola are See also:part of the same hemispherical dome, and in this case the ring courses See also:lie in See also:vertical instead of See also:horizontal planes, examples of which may be found in the vault of See also:Magnesia on Maeander in Asia Minor, and in the See also:tomb at See also:Valence known as le pendenlif de Valence. The problem is one which has taxed the ingenuity of many builders in See also:ancient times; the bas-reliefs found at Nimrud show that in the 9th See also:century B.C. domes were evidently built over square halls, and must have been carried on pendentives of some See also:kind.

End of Article: PENDENTIVE

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PENDANT (through Fr. from Lat. pendere, to hang)
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PENDER, SIR JOHN (1816—1896)