A dictionary entry on the weaving reed (also called sley or slay), the loom part with metal or cane dents through which warp threads pass. It explains how reed lengths and dent counts are measured in Scotland and elsewhere in Britain, the reed's role in beating the weft to the web, and the batten or lathe that holds it. It also describes the linen-prover and its four perforations for counting threads in Holland, Scotch and French reed standards.