WINDLASS

A 'windlass' is an apparatus for moving a heavy weight. Typically, a windlass consists of a horizontal cylinder (barrel), which is rotated by the turn of a crank or belt. A winch is affixed to one or both ends, and a cable or rope is wound around the winch, pulling a weight attached to the opposite end.
Windlasses are used on boats to raise anchor as an alternative to a vertical capstan. See anchor windlass.
Crossbows may also use windlasses as a cocking mechanism.
Windlasses are vital in the operation of almost all locks on the British Inland Waterways.