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2 definitions found
 for sinking head
From The Collaborative International Dictionary of English v.0.48 :

  Shrinking \Shrink"ing\,
     a. & n. from Shrink.
     [1913 Webster]
  
     Shrinking head (Founding), a body of molten metal connected
        with a mold for the purpose of supplying metal to
        compensate for the shrinkage of the casting; -- called
        also sinking head, and riser.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Sinking \Sink"ing\,
     a. & n. from Sink.
     [1913 Webster]
  
     Sinking fund. See under Fund.
  
     Sinking head (Founding), a riser from which the mold is fed
        as the casting shrinks. See Riser, n., 4.
  
     Sinking pump, a pump which can be lowered in a well or a
        mine shaft as the level of the water sinks.
        [1913 Webster]

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