Normal Aperture Mixed Wide Mid Vowel

Vowels have a wide, firm, and free channel, whereby the breath is modified without friction or sibilation. … in representing vowels the hand suggests a wide and firm channel, by having the accented finger bent and its terminal phalanx brought firmly in contact with the terminal phalanx of the thumb.

Vowel positions are distinguished by always having the voice phalanx of the thumb accented and in contact with the terminal phalanx of the accented finger. This kind of accent is the strongest which can be given a finger, and so always takes precedence. Two modes of accentuation may not co-exist. Mixed Vowels have the palm thrown forward so as to assume a compromising position. Wide Vowel positions differ from analogous Primary Vowel positions by having straightened unaccented fingers, to denote “Wide.” Mid Vowels have the center finger accented.

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