Each vowel sound must be distinct in enunciation and pure in quality.

Avoid blurring one with the other.

Give each its true individuality.
5.

As jewels of different hue hung on a string, so must this exercise be the stringing of vowels on a continuous stream of sound.
Exercise I TO ESTABLISH NASAL AND HEAD RESONANCE This is an exercise for focusing or placing the voice and developing the vibrations of the nasal and head cavities, the most essential parts of the resonant apparatus.

If the nostrils are kept fully open, no nasal twang will be heard.