Usage History of 'thermogram'

The following chart shows how frequently 'thermogram' appeared in printed materials over time. For example, the word 'thermogram' occurred 9 times in books in 1869 and 1,201 times in 2008. From 1869 to 2008, the word 'thermogram' was used a total of 48,485 times in books scanned by Google. See Reference: Google Ngram project.

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