A short dictionary entry from Knight's American Mechanical Dictionary defining the pattern-chain, a loom device that brings shuttles in the shuttle-boxes to the picker in the order the pattern requires. It describes two mechanisms, shown in Figs. 3570 and 3571: a chain of links of varying height that raises a lever and rod carrying the shuttle-box, and a chain acting on levers, cams, and a pawl and ratchet to raise or lower a standard holding the boxes.