Usage History of 'earthing'

The following chart shows how frequently 'earthing' appeared in printed materials over time. For example, the word 'earthing' occurred 2 times in books in 1683 and 10,198 times in 2008. From 1683 to 2008, the word 'earthing' was used a total of 140,746 times in books scanned by Google. See Reference: Google Ngram project.

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