I distinctly remember my Grandmother, from Donegal, pronouncing the word "festival" as "festibal". And in some Glaswegian pronunciations (without any connection the football team), the phrase "he's just a wee boy", for instance, would come out as something like, "he's jist a wee boa-iy" (with the "boa" part not as long as in the Constrictor variety, and the "iy" just a brief, swiftly cut-off, terminal inflexion). I wonder if that's the kind of phoneme which the early C19th phonetic rendering was attempting?