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Full text of "Chemical engineering. Notes on grinding, sifting .
Notes on Grinding, Sifting, Separating and Transporting Solid Materials. . a 2\ in. diameter ring, and the cost may be taken as twice that of machine work, viz., 8d. to is. .. in the Blake and the mechanical efficiency is often lower in consequence. .. In the Sturtevant ring-roll mill the ring is rotated verti- cally, and a series of.