Usage History of 'radiometer'

The following chart shows how frequently 'radiometer' appeared in printed materials over time. For example, the word 'radiometer' occurred 2 times in books in 1766 and 5,158 times in 2008. From 1766 to 2008, the word 'radiometer' was used a total of 310,001 times in books scanned by Google. See Reference: Google Ngram project.

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