A scale of vowels is an arrangement of vowels in order of perceived "pitch".

A scale used for poetry in American English lists the vowels by the frequency of the second formant (the higher of the two overtones that define a vowel sound). Starting with the highest,

vowel example
key
cane
kite
ɪ kit
ɛ ken
æ cat
ɝː cur
ʌ cut
ɑː cot, car
cow
ɔɪ coy
ɔː caught, core
ʊ could
coat
cool, cute

In technical terms, this listing goes from front vowels to back vowels. It is by no means precise enough for phonology. For one thing, the sounds with [ʊ] or [ɪ] as the second symbol are diphthongs, during which the formants change. Also, many American accents and practically all from other countries will require different lists. Nonetheless this scale has been used in poetry. For instance, one can identify lines that generally go upward

O love, be fed with apples while you may… (Robert Graves)
/oʊ ˈlʊv bi ˈfɛd wɪθ ˈæ.pl̩z ˈwaɪl ju ˈmeɪ/

or downward

When lilacs last in the dooryard bloom'd… (Walt Whitman)
/wɛn ˈlaɪ.læks ˌlæst ɪn ðə ˈdɔɹ.jɑɹd ˌblumd/

A pendeka (from the Greek for "fifteen") is a poem containing each of the above vowels once. The following example, which goes up the scale, is intended strictly as a mnemonic.

Mood: no good, brought voice
Down, not up, perhaps
Ends withHi, baby!

Not to be confused with

The high- and low-frequency vowels described here are not the high vowels and low vowels of linguistics. Those are vowels where the tongue is high (as in "cool" and "key") or low (as in "car") respectively. Also, this scale is not the sonority hierarchy.

References

  • Nims, John Frederick, and David Mason (2000). Western Wind: an Introduction to Poetry. McGraw-Hill. ISBN 0-07-303180-1.{{cite book}}: CS1 maint: multiple names: authors list (link) For the pendeka, see the 1982 edition, ISBN 0-07-554405-9.
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