Abstract
SOME automatic and continuous coal-weighing apparatus make use of the experimental fact that graded-to-size coal weighs the same per unit volume whatever the size of the lumps; hence a cubic foot of large lump coal weighs the same as a cubic foot of small lump coal.
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ACKERMANN, A. Open Packing of Spheres. Nature 155, 82 (1945). https://doi.org/10.1038/155082c0
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DOI: https://doi.org/10.1038/155082c0
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