Usage History of 'refractors'

The following chart shows how frequently 'refractors' appeared in printed materials over time. For example, the word 'refractors' occurred 2 times in books in 1757 and 1,176 times in 2008. From 1757 to 2008, the word 'refractors' was used a total of 48,204 times in books scanned by Google. See Reference: Google Ngram project.

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