The sounds of long a and long o were omitted
from our table of simple vowel elements, because,
as Mr. A. Melville Bell puts it, "they are both
diphthongally terminated with the closest vowel of
their respective classes — a with e and o with oo!''^
The omission of this diphthongal termination, espe-
cially notable in the «, is a common peculiarity
among deaf articulators ; the consequence is that
the a becomes too open, and such words as lady
and bahy^ etc., sound like lad-dy and bab-hy. To
correct this defect, place the pupil's hand under
the angle of your jaw, and, sounding a, emphasize
this final vanish into e by prolonging it a little
longer than is usually done.
MANUAL OF ARTICULATION TEAGHINQ. 71

The diphtliong % as in hide, etc., is formed by
beginning with the ah and combining it in one
utterance with all the vowels on the left-hand side
of our table. The diphthong au or ok\ as in out,
owl, etc., is produced by starting with the ah and
passing through all the vowel sounds on the right-
hand side of the scale till oo is reached. Oi is a
continuation of aw and short i.
