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 144
ing directly back to the cutting-head, passes forward with the sliding frame, and prevents any thrust caused by the side-cuttingaction of the chain. The standard machine is made to undercut 3^ ft. in width, 5 ft. in depth,and 3 in. in height, although these dimensions can be varied to suit special… … ^-^^ Fig. 8.—Lechner coal-mining machine. lbs., with engines for compressed air 1,.350 lbs., and with electric motor on frame of machine1,800 lbs. It is claimed that in ordinary hard bituminous coal the undercut of 17i sq. ft. ismade within four minutes. The cutting chain is provided with 39 bits,…
Mechanical engineering
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