Fig. a.—Semicircular Arch.
Fig. b.—Stilted Arch.
The Semicircular and the Stilted Semicircular Arch were the only arches in use till the introduction of the Pointed Arch. Throughout the Early English, Decorated, and Perpendicular periods they occur as exceptional features, but they were practically superseded after the close of the 12th cent.
Fig. c.—Equilateral Arch.
