A machine used for undercutting coal in which the main frame and carriage are
held stationary by roof jacks while the cutter frame advances into the kerf
during the cutting operation. Since cuts do not exceed 44 in (1.1 m) along the
face, it is necessary to relocate the machine several times before the entire
face can be cut. Jones, 1
Source:
Dictionary of Mining, Mineral, and Related Terms
