With the development of narrower, more compact fusees, the stackfreed disappeared from timepieces around 1630. It has fusees cut for catgut, which are long, and only slightly tapered. Fusees became the standard method of getting constant torque from a mainspring. Drawings from the 15th century by Filippo Brunelleschi and Leonardo da Vinci show fusees. Fusees became standard in all watches, and were used until the early 19th century.