Usage History of 'epidiascope'

The following chart shows how frequently 'epidiascope' appeared in printed materials over time. For example, the word 'epidiascope' occurred 6 times in books in 1901 and 116 times in 2008. From 1901 to 2008, the word 'epidiascope' was used a total of 7,862 times in books scanned by Google. See Reference: Google Ngram project.

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