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That the mouth can act as a resonator may be proved by holding a vibrating tuning-fork of suitable pitch before this chamber when open. The resonating chambers of importance are supra-glottic. Of these the "mouth" including all as far back as the pharynx and the nasal chambers are the principal.
It was formerly considered that pitch was determined solely by the rate of vibration of the vocal bands; though the author opposed this view as rigidly applied. Very recently Prof. Scripture, by the use of new methods, has shown that the supra-glottic chambers cannot be correctly likened to a resonator with rigid walls.
It is true that when one speaks or sings, the chest, windpipe, and larynx may be felt to vibrate, but the essential vibrations are supra-glottic above the vocal bands. These resonance-chambers are the mouth cavity, in the widest sense, and the nasal chambers.
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