UNDER-CAST, UNDER-GATE. — (See Crossing.)

UNDER-LEVEL DRIFT. — (See Standage.)

UNDER-VIEWER. — The responsible manager of a colliery in the absence of the viewer.

UP-CAST. — A rise hitch: the shaft up which the air returns from the workings to the surface.

UP-THROW. — A rise hitch, smaller than an up-east.