A Method for the Measurement of Surface of Finely Divided Material

A FEW years ago the writer had the privilege of examining a piece of apparatus in the Forest Products Laboratory of McGill University which engaged his attention. The Forest Products Laboratory has an excellent installation of wood-grinding machinery, and the officials in charge were naturally interested in acquiring means for estimating the fineness of various wood grinds.
Keywords: centrifugal pump, gram, hydrofluoric acid, McGill University, quartz, Fines, Laboratory, mining, particles, quartz, test, Tests, Water, Waters
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