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corbel

corbel table, in architecture, a continuous row of corbels (a block of stone projecting from a wall and supporting some heavy feature), usually occurring just below the eaves of a roof in order to fill in beneath a high-pitched roof and to give extra support. It was a popular architectural feature in early medieval churches, particularly in Romanesque buildings, in which the corbels were carved and elaborately ornamented with decorative motifs, such as fancifully sculptured grotesques. On medieval castle walls, parapets were supported by boldly projecting corbel tables, with floor openings between the corbels through which defenders of the castle could drop missiles, molten lead, or boiling oil on the attacking force below.

corbel, in architecture, bracket or weight-carrying member, built deeply into the wall so that the pressure on its embedded portion counteracts any tendency to overturn or fall outward. The name derives from a French word meaning crow, because of the corbel’s beaklike shape. Corbels may be individual pieces of stone, separate from each other like brackets, as in the case of many elaborately carved medieval and Renaissance cornices, or they may be continuous courses of masonry, such as the corbels under projecting oriel windows.

A corbel arch consists of two opposing sets of overlapping corbels, resembling inverted staircases, which meet at a peak and create a structure strong enough to support weight from above. Babylonian architecture made wide use of corbel arches. When such arches are used in a series, they become a corbel vault, which, as in the Mayan style, can support a roof or upper story. Corbel vaults and arches were useful in cultures that had not yet developed curving arches and other ceiling structures. Structural corbeling has fallen out of general use in contemporary architecture.