A Scientific American article (July 10, 1869) describing James Lyall's patented positive motion power loom, which drives the shuttle by a wheeled carriage running in a race-way on the lay, rather than by a picker staff. It explains the defects of conventional shuttle throwing (limited width, clashes with the lay, imperfect selvedge) and how the carriage and wheels move the shuttle without lateral motion of the warp threads. Engravings show the whole loom, the shuttle and carriage, and a section of the lay and reed. The article says it could weave very wide goods, such as six-yard-wide drugget.