William Alexander White; Suggestions for the facilitation of grain count with the petrographic microscope. Journal of Sedimentary Research ; 10 (2): 91–93. doi: https://doi.org/10.1306/D4269094-2B26-11D7-8648000102C1865D
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A new cross-hair arrangement and a spring activated stage-lock are used to eliminate observations made in peripheral parts of the field of vision.
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