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This empty abdomen with its thoracic annex forms an enormous resonator, such as no other performer in our countryside can boast of. If I close with my finger the orifice of the truncated abdomen the sound becomes flatter, in conformity with the laws affecting musical resonators; if I fit into the aperture of the open body a tube or trumpet of paper the sound grows louder as well as deeper.
Plunket Greene once told me that at one time he lost the resonance in the upper part of his voice, and on consulting a specialist he found a considerable growth on the septum. He had it removed and at once the resonance returned. Other equally strong arguments could be offered in support of the claim that the head cavities do act as resonators.
These are the "chest" register, in which the vocal cords vibrate their whole length, and the quality of tone derives most of its character from the chest cavity; and the "head" register, in which the vocal cords vibrate only in part, and the quality of tone is reenforced by the resonators of the face, mouth, and head.
"And the people who do get what we call opportunity get it usually in extremely limited and cramping forms. No man lives a life of intellectual productivity alone; he needs not only material and opportunity, but helpers, resonators. Round and about what I might call the REAL men, you want the sympathetic cooperators, who help by understanding.
When there is no interference the tone runs naturally into the proper channel. It is not necessary to use force to put it there. Whether or not the head cavities act as resonators is one of the many mooted points in voice training. Those who believe they do are much in the majority, but those in the minority are equally confident they do not. What are the arguments?
Among the discoveries of the last century in the realm of acoustics, there is one which especially helped to establish a purely kinematic conception of sound. Helmholtz showed that tones which to our ears seem to have a clear and definite pitch may be split up by a series of resonators into a number of different tones, each of them sounding at a different pitch.
It is held that the vocal bands give a number of sudden shocks to the air in the resonators, so that, in a sense, the resonance-chambers determine both the pitch and the quality of the tone; and as the tension of the resonators varies with both the physical and psychical condition of the individual, variations in tone-production, more especially as to quality, can now be the better understood.
This physicist showed that, if the electric waves are made to impinge on a flat wooden stand, on which are a series of resonators parallel to each other and uniformly arranged, these waves are hardly reflected save in the case where the resonators have the same period as the spark-gap.
Every vowel, every word, every tone, can be colored as by magic in all sorts of ways by the well-controlled play of the lips; can, as it were, be imbued with life, as the lips open or close more or less in different positions. The lips are the final cup-shaped resonators through which the tone has to pass.
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