Douglas Arthur Robson; New technique for measuring roundness of sand grains. Journal of Sedimentary Research ; 28 (1): 108–110. doi: https://doi.org/10.2110/jsr.28.108
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Describes the construction and use of a special graticule, designed for insertion in the slit ocular of a microscope, which permits direct and relatively rapid measurements of roundness in large numbers of sand grains.
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