Tunnel head

(Metal.) the top of a smelting furnace where the materials are put in.

See also: Tunnel

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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References in periodicals archive ?
On each side of the Menai, tunnel head houses, roughly the size of a three storey building, will help ventilate the tunnel and stop the cables from overheating.
My older sister once got stuck in a tunnel head down.
The tunnel head pilots the course of the drive and excavates with a cutting bit equipped with carbide drag teeth and disc cutters.
However, the deer was unharmed and eventually left the station on its own through a tunnel headed toward the Reagan National Airport, according to Metro spokesperson Dan Stessel.
Shallow enough to jump down into, it was an auxiliary entry point for a tunnel headed in the direction of Lambourn village square, half a furlong to the south.