English: Fig. 597 is a front view of a pair of rollers, used in the manufacture of iron in connection with the puddling furnace. They are about 4 feet long, divided into 4 parts, the largest being about 20 inches in diameter. That portion of the upper roller under which the metal is first passed, is cut in a deep and irregular manner, resembling that chiselling in stone called moveque work, that it may the more easily get hold of and compress the metal when almost in a fluid state. The plate is next passed under the cross-cut portion of the roller, and successively through the flat sections. The lower roller, it will be observed, is formed with raised collars at intervals, to keep the metal in its proper course. The rollers are connected by cog-wheels placed upon their axes ; upon the lowermost of these, works also the wheel by means of which the revolution is communicated. The cheeks are of cast iron, very massive, that they may bear the violent usage to which they are subjected.