John Walker published his English pronouncing dictionary in 1791
A Critical Pronouncing Dictionary and Expositor of the
English Language:
to which are prefixed, Principles of
English Pronunciation: Rules to be Observed by the Natives
of Scotland, Ireland, and London, for Avoiding their
Respective Peculiarities
The
book would see over a hundred subsequent editions
“Walker” became a household word, both in Britain and the USA
Walker did for pronunciation what Murray and Johnson had done
for grammar and the lexicon
“Though the pronunciation of London is certainly erroneous in
many words, yet, upon being compared with that of any other
place, it is undoubtedly the best” (John Walker)
It
is “more generally received” (that is “received among the
learned and polite”)
Walker saw the outlying areas of the British Isles through a
colonial mentality: their accents were inferior to the received
standard of pronunciation spoken in London