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 for Tunnel head
From The Collaborative International Dictionary of English v.0.48 :

  Tunnel \Tun"nel\ (t[u^]n"n[e^]l), n. [F. tonnelle a
     semicircular, wagon-headed vault, a tunnel net, an arbor, OF.
     also tonnel; dim. of tonne a tun; -- so named from its
     resemblance to a tun in shape. See Ton.]
     1. A vessel with a broad mouth at one end, and a pipe or tube
        at the other, for conveying liquor, fluids, etc., into
        casks, bottles, or other vessels; a funnel.
        [1913 Webster]
     2. The opening of a chimney for the passage of smoke; a flue;
        a funnel.
        [1913 Webster]
              And one great chimney, whose long tunnel thence
              The smoke forth threw.                --Spenser.
        [1913 Webster]
     3. An artificial passage or archway for conducting canals,
        roads, or railroads under elevated ground, for the
        formation of roads under rivers or canals, and the
        construction of sewers, drains, and the like.
        [1913 Webster]
     4. (Mining) A level passage driven across the measures, or at
        right angles to veins which it is desired to reach; --
        distinguished from the drift, or gangway, which is led
        along the vein when reached by the tunnel.
        [1913 Webster]
     Tunnel head (Metal.), the top of a smelting furnace where
        the materials are put in.
     Tunnel kiln, a limekiln in which coal is burned, as
        distinguished from a flame kiln, in which wood or peat
        is used.
     Tunnel net, a net with a wide mouth at one end and narrow
        at the other.
     Tunnel pit, Tunnel shaft, a pit or shaft sunk from the
        top of the ground to the level of a tunnel, for drawing up
        the earth and stones, for ventilation, lighting, and the
        [1913 Webster]

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