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The cavity then is a resonance-chamber for the fork, and thus intensifies its sound; in other words, the air in the mouth cavity vibrates in harmony with the tuning-fork.
The pitch of this vowel is high. The pitch of this vowel is also high. That the mouth cavity really can act as a resonance-chamber can be easily demonstrated by holding a small vibrating tuning-fork before the open mouth, and varying the shape and size of the cavity till the sound of the fork is observed to be suddenly increased in volume.
This is the only true placing of voice, the combination of head and chest resonance through automatic form and adjustment. A tight throat through local, muscular effort makes these conditions impossible. The true resonance-chamber then, as we have found, is from head to chest; sympathetically the resonance of the entire body must be added.
Stringed instruments like the guitar, zither, and violin form another class which begins with the bow and its twanging string. The power of the note was intensified by holding a gourd against the bow to serve as a resonance-chamber.
Moreover, an expanded chest is a splendid resonance-chamber, affords a firm support to the windpipe and adds to the sure and vibrant quality of the tone produced. The wobble, which at times causes disappointment with voices that had seemed unusually fine, is the result of lack of attention to this detail of vocal method.
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