File:Vowels Figures Willis 1830 33 Figure 10.png

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English: Illustration of apparatus for producing vowel sounds. From:Willis, Robert (1930). "On vowel sounds, and on reed organ pipes". Transactions of the Cambridge Philosophical Society 3: 261-268.
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Source https://archive.org/details/willis-1828b-transactionsofca-03camb/page/n32
Author Willis, Robert, 1800-1875
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