Published online by Cambridge University Press: 06 February 2009
Christoph Friedrich Hellwag was probably the first scholar who tried to show the auditory relationships and the relative distances of the vowels (Hellwag [1791] 1991). He described the vowels in a space in which the vowels formed a triangle (He didn't actually use the word ‘triangle,’ but spoke instead about a ‘scale,’ ‘ladder,’ ‘stairs,’ or ‘symmetric scheme’ (Monin 1991: 22)). The cardinal vowel system, created by Daniel Jones, has been a valuable frame work for vowel quality description, but it is partly articulatory, partly auditory.