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In the two end pieces of a heavy iron frame were set three rolls, or cylinders one in the centre, another below, and the other above all three being in a vertical line. These rolls were of cast iron three feet in diameter, having chilled-iron smooth face-plates of considerable thickness.
In the two end-pieces of a heavy iron frame were set three rolls, or cylinders one in the centre, another below, and the other above all three being in a vertical line. These rolls were about three feet in diameter, made of cast-iron, and had face-plates of chilled-iron. The lowest roll was set in a fixed bearing at the bottom of the frame, and, therefore, could only turn around on its axis.
These latter rolls were also face-lined with chilled-iron plates; but, unlike the larger ones, were positively driven, reducing the rock to pieces of about one-half-inch size, or smaller.
To the faces of these rolls were bolted a series of heavy, chilled-iron plates containing a number of projecting knobs two inches high. Each roll had also two rows of four-inch knobs, intended to strike a series of hammer-like blows.
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