COPYGRAPH

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