a. In salt mining, an electrically driven machine somewhat like a gigantic chain
saw. It has a long, thin horizontal bar, about which revolves an endless chain
with cutting bits. The most common type is an adaptation of the shortwall coal
cutter, a drag-type machine with continuous pick-filled chains to cut at the
floor or bottom of the seam. It can make a rapid, continuous cut across the
entire width of the face. Kaufmann
