LIP POSITIONS IN AMERICAN ENGLISH VOWELS.

Three kinds of data were used in an attempt to determine the parameters of characteristic lip positions in a range of American English vowels :standardized simultaneous frontal and lateral photographs; lateral x-rays; plaster casts of a subject's lips. This paper describes an investigation of some parameters of lip positions which occur during the articulation of a range of American English vowels. Other approaches to the investigation of lip positions have been taken. Measurements of mouth openings for four vowels in different consonantal contexts were given as functions of time.