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A heavy coal cutter for use in headings and rooms in pillar methods of
working. The machine weighs about 12 hundredweight (545 kg) and is usually
mounted on a light carriage to suit the mine track. A percussive drill,
with extension rods, makes a horizontal cut about 5-1/2 ft (1.68 m) deep
and 15 ft (4.57 m) wide at any height in the heading. The central column
is tightened between roof and floor about 4-1/2 ft (1.37 m) from the face.
The machine can also be used for drilling shotfiring holes. Nelson
Source:
Dictionary of Mining, Mineral, and Related Terms
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