A short dictionary entry on the hackle (also heckle or hatchel), a board of sharp steel spikes used to comb hemp or flax, aligning the fibers and separating tow and hards from the fine line fiber. It describes the arrangement and length of the teeth, how a lock of flax is drawn through, and the repeated hackling on finer combs. Two engraved figures show a hackling machine with rotating combs and a flax lock drawn over teeth.