Abstract
This is a very interesting subject, at least to those who have anything to do with coal mines. And yet I have not met with anything that points to it, nor any formula whereby it might be calculated. But perhaps this is a subject to which the attention of physicists has not been drawn. I have been told that blasting has been beard at the distance of 150 yards underground, and I have heard the signals of the colliers, i.e., by hitttng the surface of the coal with one of their tools, at the distance of fifty or sixty yards, and have also heard the shouts of the men at the distance of fifteen yards; but I have never met any person who conld give the velocity, nor seen any book on physics in which there is anything concerning it. But perhaps it is a very hard subject to deal with from the difference of the specific gravity of the coals, and also the different temperatures that we meet there. And it from these different causes it would be hard to find the real velocity, yet by calculating a velocity that might be rather theoretical at first, we might by degrees come nearer the truth.
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JOSEPH, D. Velocity of Sound in Coal. Nature 4, 487 (1871). https://doi.org/10.1038/004487f0
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DOI: https://doi.org/10.1038/004487f0
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