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Published online by Cambridge University Press: 06 February 2009
In his book An Introduction to the Pronunciation of English A. C. Gimson (1970) describes the articulation of the English plosives in different phonetic contexts. He demonstrates here (146–54 and 156–8) and elsewhere (Gimson, 1960) the articulatory instability of, in particular, the alveolar plosives /t/ and /d/ in English. As W. S. Allen (1960) points out, the predominance of instability associated with the alveolar plosives, rather than with the bilabials /p/ and /b/ or velars /k/ and /g/ may correlate with the more common occurrence of the alveolars rather than with articulatory or other kinds of constraints specific to consonantal clusters containing /t/ and /d/.