The galvanoplastic process of M. Coblence for obtaining electrotypes
of wood-engravings is as follows: A frame is laid upon a marble block,
and then covered with a solution of wax, colophane, and turpentine.
This mixture on the frame, after cooling, becomes hard, and presents a
smooth, even surface. An engraved wooden block is then placed upon the
surface of the frame, and subjected to a strong pressure. The imprint
on matrix in cameo, having been coated with graphite, is then placed
vertically in a galvanoplastic bath, and a cast, an exact reproduction
of the wood-engraving, is obtained. The shell is then backed with type
metal and finished in the usual way.--_Printer and Stationer._
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