Note (return) — LIST OF HOMOPHONES

by which it will be seen that the ten names contain eight but only eight different vowels, 0 and 4 having the same vowel aw, while 5 and 9 have ai. Both these pairs caused confusion; the first of them was cured by substituting the name of the letter O for the name of the zero cipher, which happens to be identical with it in form,9 and this introduced a ninth vowel sound ou (= owe), but the other pair remained such a constant source of error, that persons who had their house put on the general telephonic system would request the Post Office to give them a number that did not contain a 9 or a 5; and it is pretty certain that had not the system of automatic dialling, which was invented for quite another purpose, got rid of the trouble, one of these two ciphers would have changed its name at the Post Office.