upcast shaft

from The Collaborative International Dictionary of English v.0.48

Upcast \Up"cast`\, n.
   1. (Bowling) A cast; a throw. --Shak.
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   2. (Mining.) The ventilating shaft of a mine out of which the
      air passes after having circulated through the mine; --
      distinguished from the downcast. Called also {upcast pit},
      and {upcast shaft}.
      [1913 Webster]

   3. An upset, as from a carriage. [Scot.]
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   4. A taunt; a reproach. [Scot.] --Sir W. Scott.
      [1913 Webster]