Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics (1892)
Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 142
FiQ- 4.—JelTiey coal-iiiiiiing inacbine. … iiiachiiit ner. This is continued until the entire width of the room has been undercut, after which the ma-chine is loaded on the truck and taken into another room. The makers claim that in some coal-veins the machines have cut at the rate of 130 to 150 lineal ft. face in ten hours to a depth of 6…
Mechanical engineering
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