Abstract

An automatically recording settling tube for rapid size analysis of sand can be constructed from Plexiglass tubing, a transducing cell, and a small chart recorder for less than 1100 dollars (1968 prices). It eliminates time consuming processes associated with sieving, and yields data in terms of hydraulic equivalent size. Reproducibility of the arithmetic mean averages to + or - 0.9 percent for several replicate samples. This compares with + or - 1 percent for sieves, and + or - 5 percent for the Emery tube.

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