a. A fishing tool in the modified form of a horn socket. The lower end or mouth is cut away on one side and resembles a scoop; because of its shape, the device, as it is turned, works around and behind an object that has become partly embedded in the wall of a borehole, thus engaging it where a regular horn socket would fail. Long
b. A small hoist to facilitate car changing near the loader in a tunnel. An empty car is either lifted above the track (to allow a loaded car to pass beneath) or swung to one side free of the track. See also: double-track portable switch particularly for handling large cars. Nelson
c. In tunneling, a small traveling crane spanning tracks that transfers an empty car to a parallel track so that a loaded one can be drawn from the advancing end. Pryor, 3
d. A small derrick made up of a sheave on an A-frame, a winch and winch line, and a hook. Usually mounted on a truck. Nichols, 2
Source:
Dictionary of Mining, Mineral, and Related Terms












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