Scientific American. AUGUST 6, 1892. ] A NEW MILL FOR PULVERIZING, the nature of the substance … able circumstances is equal terial being constantly agitated and thrown up, so that toa foree of at least 715 it is acted upon by the roller as it travels around the pounds per square inch. inner surface of the ring. As the grinding is done by In an experiment performed, a force of 1,260 pounds,…
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