Dennis Butler Fry (3 November 1907 – 21 March 1983) was a British linguist and Professor of Experimental Phonetics at University College London. Through experiments he conducted in the 1950s and 1960s, Fry demonstrated that lexical stress correlated with loudness, pitch, and length of the affected vowel.[1][2]

Dennis Butler Fry
Born(1907-11-03)3 November 1907
Stockbridge, Hampshire, United Kingdom
Died21 March 1983(1983-03-21) (aged 75)
London, United Kingdom
Known forWorks on English phonetics
Academic work
InstitutionsUniversity College London


  • Fry, D.B. (ed.) (1976). Acoustic phonetics: a course of basic readings. Cambridge: CUP
  • Fry, D.B. (1977). Homo loquens: man as a talking animal. Cambridge: CUP
  • Fry, D.B. (1979). The physics of speech. Cambridge: CUP
  • Fry, D.B. and Kostić, Đ. (1939). A Serbo-Croat phonetic reader. London: University of London Press
  • Whetnall, E. and Fry, D.B. (1964). The deaf child. London: Heinemann
  • Whetnall, E. and Fry, D.B. (1970). Learning to hear. London: Heinemann

See alsoEdit


  1. ^ "Obituary of D.B. Fry".
  2. ^ Koffi, Ettien (2018). "A Just Noticeable Difference (JND) Reanalysis Of Fry's Original Acoustic Correlates Of Stress In American English". Linguistic Portfolios. 7 (1): 2–25.