Thus, in An outline of English phonetics (1962, ninth edition, Cambridge: W. Heffer & Sons) he noted that sad, bad generally had /æː/ but lad, pad had /æ/.
譬如，在《英語語音學概要》(An outline of English phonetics, 1962, 第9版, Cambridge: W. Heffer & Sons)一書中丹尼爾提到sad、bad一般是發/æː/音，不過lad、pad卻是發/æ/音。