The remaining resonators of the harmonic series with their
capsules and gas-jets respond in the same manner to the overtones proper to
each vowel sound when the fundamental note is sung.]
Each resonator corresponds from below upwards to the harmonics of the
fundamental note c. In order to know if the sound of the voice contains
harmonics and what they are, it is necessary to sing the fundamental note c
on some particular vowel sound; the resonators corresponding to the
particular harmonics of the vowel sound are thus set in action, and a
glance at the revolving mirror shows which particular gas jets vibrate.
Experiments conducted with this instrument show that the vowel _U=oo_ is
composed of the fundamental note very strong and the third harmonic (viz.
g) is fairly pronounced.
_O_ (_on_) contains the fundamental note, the second harmonic (the octave
c') very strong, and the third and fourth harmonics but weak.
The vowel _A_ (_ah_) contains besides the fundamental note, the second
harmonic, weak; the third, strong; and the fourth, weak.
The vowel _E_ (_a_) has relatively a feeble fundamental note, the octave
above, the second harmonic, is weak, and the third weak; whereas the fourth
is very strong, and the fifth weak.
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