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Rapid method of mechanical analysis of sands

Kenneth O. Emery
Rapid method of mechanical analysis of sands
Journal of Sedimentary Petrology (December 1938) 8 (3): 105-111


A new method of mechanical analysis of sands employing settling velocities has been developed especially for use aboard ship in geologic work connected with the ocean. Since coarse grains fall faster in water than fine ones, a mechanical analysis of a sample of sediment can be made by allowing the material to settle through a long column of water and observing the amounts of material which reach the bottom of the column during successive experimentally determined time intervals. A complete analysis requires about five minutes for most sands. Among the advantages over sieving, other than saving in time and labor, are: (1) The results obtained are more closely related to conditions of deposition, since actual deposition of sand in water depends upon settling velocities rather than on mere size of grains. This is illustrated by a comparison of sieve and tube analyses of the same samples of sand. (2) Data can be taken for a continuous frequency curve by which a more complete picture of the degree of sorting can be found.

ISSN: 0022-4472
Serial Title: Journal of Sedimentary Petrology
Serial Volume: 8
Serial Issue: 3
Title: Rapid method of mechanical analysis of sands
Author(s): Emery, Kenneth O.
Pages: 105-111
Published: 193812
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
Accession Number: 1939-005543
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 5 figs.
Source Note: abstract, Geol. Soc. America Proc. 1937, p. 79, June 1938; reprinted as California Univ. Scripps Inst. Oceanography Contr. 44, 1939.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1939
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