Although new types should be avoided at first, their exclusion is only a practical consideration, not a matter of principle, and there is no reason why they should not afterwards be introduced by degrees. Thus Mr. Pitman's is unquestionably superior to q as a symbol of the back nasal ng, for its shape at once associates it with the other nasals n, m. Again the Greek and (or perhaps better the Anglo-Saxon ð) would do very well for th and dh, both being easily written. The long s and the tailed z of Pitman's Phonotypy are also excellent letters for sh and zh. We should thus avoid the ambiguity of such words as pothuk (pothook), which at present can only be avoided by writing pot-hook.
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James Chandler 1998.