A type of lantern clock in which the chapter ring protrudes a considerable distance beyond the normal lantern-clock frame. Although the sheep's-head clock first appeared c. 1700, it only became popular towards the middle of the 18th century. The larger chapter ring made it easier to tell the time. The distended appearance of this clock, with the exaggerated curves of the chapter ring on either side, perhaps suggested the coiled horns of a ram, though the term 'sheep's head' seems somewhat strange.