A vertical cleated drum or cylinder, revolving on an
   upright spindle, and surmounted by a drumhead with sockets for bars or
   levers. It is much used, especially on shipboard, for moving or raising
   heavy weights or exerting great power by traction upon a rope or cable,
   passing around the drum. It is operated either by steam power or by a
   number of men walking around the capstan, each pushing on the end of a
   lever fixed in its socket.