Usage History of 'penetrometers'

The following chart shows how frequently 'penetrometers' appeared in printed materials over time. For example, the word 'penetrometers' occurred 2 times in books in 1905 and 309 times in 2008. From 1905 to 2008, the word 'penetrometers' was used a total of 9,680 times in books scanned by Google. See Reference: Google Ngram project.

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