Usage History of 'pneumograph'

The following chart shows how frequently 'pneumograph' appeared in printed materials over time. For example, the word 'pneumograph' occurred 5 times in books in 1869 and 149 times in 2008. From 1869 to 2008, the word 'pneumograph' was used a total of 21,370 times in books scanned by Google. See Reference: Google Ngram project.

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