Usage History of 'bathyspheres'

The following chart shows how frequently 'bathyspheres' appeared in printed materials over time. For example, the word 'bathyspheres' occurred 4 times in books in 1935 and 30 times in 2008. From 1935 to 2008, the word 'bathyspheres' was used a total of 1,502 times in books scanned by Google. See Reference: Google Ngram project.

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