Benjamin Franklin's phonetic alphabet as follows: Franklin's proposed alphabet included seven letters to represent vowels. This set consisted of two new letters, in addition to five letters from the existing English alphabet: a, e, i, o, u. The first new letter was a formed as a ligature of the letters o and a, and used to represent the sound (as written in IPA). The second, ɥ, was used for . Franklin proposed the use of doubled letters to represent what he called long vowels, represented by modern phonemes thus: as the long-vowel variant for (or, in his notation, "cɩcɩ" versus "cɩ"), for ("ee" versus
Phonological history of English vowels Phonological history of English vowels In the history of English phonology, there have been many diachronic sound changes affecting vowels, especially involving phonemic splits and mergers. The Great Vowel Shift was a series of chain shifts that affected historical long vowels but left short vowels largely alone. It is one of the primary causes of the idiosyncrasies in English spelling. The shortening of ante-penultimate syllables in Middle English created many long–short pairs. The result can be seen in such words as, <nowiki>*</nowiki>Earlier Modern English merged with . Tense–lax neutralization refers to a neutralization, in a particular phonological context in a