Phonetic notation of segmental sounds is of two main types, phonemic transcription and phonetic transcription proper which, to avoid ambiguity, is generally now referred to by British phoneticians, following the suggestion of Abercrombie (1953), as ‘allophonic transcription’. The two most important discussions of types of notation for English are Jones (1956: Appendix A) and Abercrombie (1964); for further comments see Windsor Lewis (1969: Chap. III) and Gimson (1970: § 5.6). Of the many different phonetic notations used for English more or less all of them in the last half century or so have employed the symbols of the Association's alphabet, in Britain usually faithfully observing the principles laid down by the Association for their use. In America the principles have not been so generally accepted. They are set forth in Jones, 1949 (PIPA (1949)).