"How now brown cow" is a phrase used in elocution teaching since at least 1926[1] to demonstrate the diphthong //.[2]

Vowel diagram for English diphthongs including /aʊ/, charting tongue height and position during articulation

References

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  1. ^ Bagley, Louie: "Elocution do's and dont's", Frederick A. Stokes Company, 1926
  2. ^ Wise, Jessie; Buffington, Sara (2004). The Ordinary Parent's Guide to Teaching Reading. Charles City, VA: Peace Hill Press. pp. 203. ISBN 978-09-72860-31-4.