Sinking head

(Founding) a riser from which the mold is fed as the casting shrinks. See Riser, n., 4.

See also: Sinking

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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If the Wye is carrying extra water an alternative to spinning is to use a sinking head line and a heavy tube fly to get down into the water and a Willie Gunn pattern is a favourite on the river.