Usage History of 'hydrophone'

The following chart shows how frequently 'hydrophone' appeared in printed materials over time. For example, the word 'hydrophone' occurred 6 times in books in 1804 and 3,159 times in 2008. From 1804 to 2008, the word 'hydrophone' was used a total of 120,522 times in books scanned by Google. See Reference: Google Ngram project.

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