Equipment is described for measuring porosity of incoherent sand by a wholly volumetric method. The simple, lightweight apparatus is suited for use at temporary field bases. The apparatus consists of a thin-walled metal sample barrel of known volume for obtaining bulk volume of the sample, a long-stemmed glass volumeter for measuring aggregate grain displacement in water, and a manual stirring device. The method is best suited for determination of porosity in loose, moderately clean sand deposits such as beaches, dunes, and river bars. Estimated error of the measurement method is 1.3 percent. The dispersion in a set of duplicate determinations is 2 percent of the mean value because of variations in sampling procedure.

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