Abstract
YOUR correspondent will find in Prof. Tyndall's beautiful work on “Sound” the data required for the exact determination of its velocity in different media. I believe that in coal it will be found to be between six and seven times that in air, or about 7,000 feet per second.
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J., C. Velocity of Sound in Coal. Nature 4, 506 (1871). https://doi.org/10.1038/004506c0
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DOI: https://doi.org/10.1038/004506c0
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