Traditional dialect boundaries in the United States
have received renewed attention (Labov, 1991, 1994). Labov
outlined three dialects of English (the Northern Cities
Chain Shift, the Southern Chain Shift, and the Third Dialect),
the boundaries of which are defined by chain shifts in
the vowel system and roughly correspond to traditional
dialectal boundaries defined through the bundling of lexical
items (Kurath, 1949) and phonological isoglosses (Kurath
& McDavid, 1961). Other research has suggested that
the Third Dialect may be the most heterogeneous of these
dialects, with speakers in different areas displaying widely
disparate behaviors (see, e.g., Clarke, Elms, & Youssef,
1995; Di Paolo, 1988; Di Paolo & Faber, 1990; Labov,
1996; Moonwomon, 1987). The present article contributes
towards a richer picture of the Third Dialect by offering
the first systematic variationist analysis of speech in
Pittsburgh, with a particular focus on three phonological
processes: vocalization of /l/, laxing of /i/ before /l/,
and laxing of /u/ before /l/. I argue that Veatch's
(1991) model of English syllable structure provides a unified
account of these seemingly unrelated phonological changes
in Pittsburgh; the implications of this argument for further
research on Pittsburgh speech are also noted.