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Copygraph

02319 Cop"y*graph (?), n. A contrivance for producing manifold copies of a writing or drawing. note &hand; The writing or drawing is made with aniline ink on paper, and a reverse copy transferred by pressure to a slab of gelatin softened with glycerin. A large number of transcripts can be taken while the ink is fresh. /note Various names have been given to the process [the gelatin copying process], some of them acceptable and others absurd; hectograph, polygraph, copygraph, lithogram, etc.
Knight.
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