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Updated: May 6, 2025
The cause, which is trivial and easily removed, should be properly understood, and cannot be given in clearer language than that used by Professor Tyndall: "Behind the tympanic membrane exists a cavity the drum of the ear in part crossed by a series of bones, and in part occupied by air. This cavity communicates with the mouth by means of a duct called the Eustachian tube.
Involuntarily the mouth opens: the air rushes in the Eustachian tube, and with sudden velocity strikes the intruded tension of the drum, which snaps back to its normal state with a sharp, pistol-like crack. The strain is momently relieved to be renewed again, and again relieved by the same attending salutes.
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