He lived 1785 to 1863. As language develops, sound usage shifts according to rules {Grimm's Law} [1822], accounting for sound pairing among languages.
He lived 1846 to 1896. In all languages, sound changes follow same rules {Verner's Law} [1875].
He lived 1881 to 1967 and invented International Phonetic Alphabet. Cardinal vowels have different articulation places, such as tongue height, mouth front or back, and rounded or unrounded lips.
He lived 1890 to 1938 and studied phonemes.
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Date Modified: 2022.0225