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A plunger-type jig with the plunger beneath the screen. May be either
single or multiple compartments. Its distinguishing features are (1) the
stroke is produced with a cam operated by a lever and rocker-arm
mechanism, (2) the weight of the column of water above the plunger is
balanced by means of compressed air, (3) automatic operation is obtained
by means of a submerged float that measures the specific gravity of the
mass of coal, refuse, and water at the peak of the pulsion stroke, (4)
refuse is withdrawn through a star gate extending the full width of the
overflow lip, and (5) the slope of the screen plate is readily adjustable
by means of heavy screws at the feed end. It is widely used on bituminous
coal on sizes ranging up to a maximum of 6 in (15 cm). Mitchell
Source:
Dictionary of Mining, Mineral, and Related Terms
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