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A New Apparatus for Recording Particle Size Distribution
C. L. Bascomb
A manometer and sensitive capacitance transducer follow the drop in hydrostatic pressure at a point near the bottom of a column of soil suspension, during sedimentation. Current from the transducer is fed to a recorder, which traces an accumulation curve. The first derivative (slope of the curve) gives a summation curve of the particle size distribution.
Results on four soils with different particle size distributions agree with those obtained by a standard pipette-sampling/sieving procedure over the range 20-200µ, effective settling diameter.
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