A short dictionary entry from Knight's American Mechanical Dictionary defining the positive-motion loom, in which the shuttle receives a definite velocity and amount of motion. It describes Lyall's version, driven by a cylindrical band, band-wheel, rack and pinion, and a carriage with wheels that run against the warp threads and the shuttle wheels. An engraving (Fig. 3903) shows the loom and a plan view of the shuttle and wheels.