The voice teachers of the past and the present have been trying and are tying to standardize their work in teaching the control of the human voice. Without a standard of measurement this was not possible. The acoustical scientists have evolved a standard of measurement in the art of the reproduction of the human voice. The speaker through practical demonstration believes he can prove that the same standard of measurement can be applied to the training of the human voice in speech and in song. With this end in view the speaker has evolved and applied in his teaching an acoustic measuring apparatus with which the student of voice can hear his own voice amplified and measure the right pressure of the vowel continuant through the deflection of a sensitive meter.