clock design that originated in the United States in the 1830s, distinguished by a case the front outer edges of which are curved into an S-shape (ogee). This shape is formed by the union of a convex and a concave line. A mass-produced variant of the shelf clock, the ogee clock stands about 30 inches (75 cm) high and is usually weight-driven. The movements were usually made of brass and were made to run for 30 hours or eight days.