Usage History of 'jackknife'

The following chart shows how frequently 'jackknife' appeared in printed materials over time. For example, the word 'jackknife' occurred 2 times in books in 1764 and 7,015 times in 2008. From 1764 to 2008, the word 'jackknife' was used a total of 148,876 times in books scanned by Google. See Reference: Google Ngram project.

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