Abstract
A batch of programs for rapid processing of sand and silt granulometric data has been in use at the Ben-Gurion University for several years. The data have been obtained from settling tube analyses. The batch begins with the digital output of the settling tube, converts the level of accumulation to percent accumulation and calculates a probability scale, and converts the time of settling into grain-size equivalents expressed in phi units; finally it gives the parameters of a modular triangle that represents the analyzed sample, showing: P = midpoints of grain sizes of the modal subpopulation, in phi units: S = relative sorting in absolute values; A = approach to lognormal distribution in percent. This process now is in use for both geological and engineering purposes.
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