Usage History of 'isotone'

The following chart shows how frequently 'isotone' appeared in printed materials over time. For example, the word 'isotone' occurred 2 times in books in 1913 and 90 times in 2008. From 1913 to 2008, the word 'isotone' was used a total of 5,493 times in books scanned by Google. See Reference: Google Ngram project.

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