Usage History of 'magnetograph'

The following chart shows how frequently 'magnetograph' appeared in printed materials over time. For example, the word 'magnetograph' occurred 6 times in books in 1862 and 276 times in 2008. From 1862 to 2008, the word 'magnetograph' was used a total of 17,629 times in books scanned by Google. See Reference: Google Ngram project.

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