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THE POPULAR SCIENCE MONTHLY.
Fig. 19.—Old Form of Slitting-Mill in Use in Sweden in 1734.
mill of this kind. It will be noted that the top roll and set of cutters were driven from one water-wheel, and the bottom roll and cutters from another; it will also be observed that the iron was evidently heated directly upon the coal. Swedenborg says: "In the vicinity of Liége are a few works in which iron is rolled
