copper-plate engraving the lines are etched, or cut by a graver in a plate; then filled with an ink; the surface of the plate wiped clean; the paper laid upon the surface of the plate, and both run through a roller-press, by which the ink is transferred to the paper.
Vasari ascribes the invention of engraving on copper to a goldsmith of Florence named Maso Finiguerra, about 1460.
The oldest engravers whose names and marks are known were Israel de Mecheln, of Bokholt, in the bishopric of Munster; Martin Schoen, of Colmar, in Alsace, where he died 1486; Michael Wolgemuth, of Nuremberg, the preceptor of the famous Albert Durer.
This press is for obtaining impressions from sunken engravings; that is, those in which the design is cut into the copper or steel plate, in contradistinction to such as have the design salient, as in wood-engravings, where the part which is not designed to print is cut away.
In copper or steel plate engraving, lines are