Usage History of 'theodolites'

The following chart shows how frequently 'theodolites' appeared in printed materials over time. For example, the word 'theodolites' occurred 2 times in books in 1673 and 1,220 times in 2008. From 1673 to 2008, the word 'theodolites' was used a total of 52,039 times in books scanned by Google. See Reference: Google Ngram project.

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