Abstract
So far as I am aware, the peculiar effect described below of a disruptive pressure on small particles of coal has not hitherto been observed. The observations were made in the course of an examination of very fine coal dust from a ball mill which is claimed to grind coal to micron size.
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BODDY, R. Microscope Observations of the Crushing of Coal. Nature 151, 54 (1943). https://doi.org/10.1038/151054a0
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DOI: https://doi.org/10.1038/151054a0
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