The vowel sound of _i_ is an exception; for as a compound of _ah_ and _ee_, the extremes of the vowel scale, it requires two distinct positions for its utterance with a movement of transition between; it is not, therefore, a good vowel for initial practice.
[Illustration: FIGURE 2.] [Illustration: FIGURE 3.] [Illustration: FIGURE 4.] [Illustration: FIGURE 5.] Figure 5 shows that the sound _aw_ is produced from _o_ by raising the edge of the upper lip outward and upward, and flattening the raised portion laterally.
Figure 6 shows the position for producing _ah_.

It differs from the position assumed for _aw_ in that the opening of the lips is larger, the upper lip is raised higher, the flat portion is wider, and the under lip is a little relaxed.

The form of the opening to produce _aw_ is oval; the form for _ah_ is more nearly square.
[Illustration: FIGURE 6.] [Illustration: FIGURE 7.] Figure 7 shows the under jaw relaxed, as it should be in practice, to enlarge the throat and give roundness and largeness to the tone.

The use of the word _hung_ will accomplish this end.
The vowel sounds illustrated above are embodied in a series of vocal exercises to be found in Chapter VIII on _Placing the Voice_..