trimming-spout

from The Century Dictionary.

• noun A delivery-spout from a grain-elevator or a coalpocket, or from a conveyer delivering sand, coal, broken stone, or other material in bulk to a ear or boat, and designed to deliver the material in different directions at will to place it evenly or in such a way as to trim the vessel and keep it upon an even keel, or to distribute the load to the ear in such a manner that the larger part of the weight shall come over the trucks and prevent uneven strains in the floor of the car. It is so jointed that the open end can be slued in any direction while delivering the material.