Abstract
FOR the purposes of laboratory or lecture experiments it is convenient to use a pitch so high that the sounds are nearly or altogether inaudible. The wave-lengths (1 to 3 cm.) are then tolerably small, and it becomes possible to imitate many interesting optical phenomena. The ear as the percipient is replaced by the high-pressure sensitive flame, introduced for this purpose by Tyndall, with the advantage that the effects are visible to a large audience.
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Interference of Sound 1 . Nature 66, 42–44 (1902). https://doi.org/10.1038/066042b0
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DOI: https://doi.org/10.1038/066042b0