. Official proceedings . A Shortwall undercutting machine in operation. 59 ing gTKxl track and good rolling stock. Jn this i>icture you seea train of Hi niine cars drawn by a 2(J!-ton electric systems and dis])atchers such as you railroad men arefamiliar, with are emjdoyed to exj^edite the handling of theloaded and empty trains. A mine \producing 7,01)0 or s,()0() tonsjjer day presents quite a transportation A dispatcher at work. The coal after reaching the surface, instead of Ijeing ])assedover a coal tipple for cleaning by hand and screening, it isnow by the mo
. Official proceedings . A Shortwall undercutting machine in operation. 59 ing gTKxl track and good rolling stock. Jn this i>icture you seea train of Hi niine cars drawn by a 2(J!-ton electric systems and dis])atchers such as you railroad men arefamiliar, with are emjdoyed to exj^edite the handling of theloaded and empty trains. A mine \producing 7,01)0 or s,()0() tonsjjer day presents quite a transportation A dispatcher at work. The coal after reaching the surface, instead of Ijeing ])assedover a coal tipple for cleaning by hand and screening, it isnow by the modern idea i)assed through a mechanical cleaningand screening i)lant, the o])eration of which is entirely auto-matic, eliminating the \ariable elements for wdiich the ])r(Kluctby the old method is noted. Out of consideration more or less for the railroad locomo-tive men, a magnetic separation of tram]) iron from the coalwas the first stej) of our cleaning operation. In all the mechanical cleaning ])rocesses the fundamental])rinciple of sei)arating coal from impurity is based on the dif-ference in weight of materials, so it narrows down to a separa-tion by graxity. Whether this gravity is set u]) mechanicallyor b} building uj) a soluticjn of sand and water or by air i)res- 60
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Keywords: ., bookcentury1900, bookdecade1900, bookidofficialproc, bookyear1901
