Camber


From Encyclopedia Britannica (11th edition, 1910)

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Camber (derived through the Fr. from Lat. camera, vault), in architecture, the upward curvature given to a beam and provided for the depression or sagging, which it is liable to, before it has settled down to its bearings. A “camber arch” is a slight rise given to the straight-arch to correct an apparent sinking in the centre (see Arch).