Usage History of 'pneumographs'

The following chart shows how frequently 'pneumographs' appeared in printed materials over time. For example, the word 'pneumographs' occurred 2 times in books in 1877 and 52 times in 2008. From 1877 to 2008, the word 'pneumographs' was used a total of 2,822 times in books scanned by Google. See Reference: Google Ngram project.

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