Usage History of 'penstocks'

The following chart shows how frequently 'penstocks' appeared in printed materials over time. For example, the word 'penstocks' occurred 2 times in books in 1716 and 578 times in 2008. From 1716 to 2008, the word 'penstocks' was used a total of 40,447 times in books scanned by Google. See Reference: Google Ngram project.

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