Abstract
I AM not aware whether the following explanation of this curious acoustical phenomenon has ever appeared in print; if it has, it will, I think, bear repetition, as offering an interesting illustration of some of the laws of propagation of undulations through aërial media.
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POLE, W. On the Alteration of the Note of Railway Whistles in Trains Meeting Each Other . Nature 11, 232–233 (1875). https://doi.org/10.1038/011232b0
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DOI: https://doi.org/10.1038/011232b0