The Collaborative International Dictionary of English v.0.48:

Wince \Wince\, n. [See Winch.] (Dyeing & Calico Printing)
   A reel used in dyeing, steeping, or washing cloth; a winch.
   It is placed over the division wall between two wince pits so
   as to allow the cloth to descend into either compartment. at
   will.
   [1913 Webster]

   Wince pit, Wince pot, a tank or a pit where cloth in the
      process of dyeing or manufacture is washed, dipped in a
      mordant, or the like.
      [1913 Webster]