What is a wooden instrument like a large knife, about two feet long, with one thin edge, used for beating and cleaning flax; a scutcher; - - called also swingling knife, swingling staff, and swingling wand called?

swingle — A wooden instrument like a large knife, about two feet long, with one thin edge, used for beating and cleaning flax; a scutcher; - - called also swingling knife, swingling staff, and swingling wand. (Webster's 1913.)