tific American be distributed and used anew. It was made prac-tical by Earl Stanhope about 1804, and was intro-duced into New York in 1813. The plaster and clayprocesses were superseded in 1829 by the papier-mache process, in which a mold is taken on preparedpaper, which is baked and which can then… … ROUTING CURVED STEREOTYPE PLATES. process was tried experimentally in New York in 1841by Prof. Mapes. An impression is taken in speciallyprepared wax, and the mold is blackleaded to insureelectrical contact. It is then placed in a plating bathand a shell of copper is deposited. This is strippedfrom…
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