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THE POPULAR SCIENCE MONTHLY. 



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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 Lie'ge are a few works in which iron is rolled 



