Here the line usage forms are 1,3, and 4. Geodetic lines (not common engraver's word, used here because there's no better available jus now) which make a greyshade and in addition try to show the curvature of the surface Hatches where the line density is constant, but the varying line widths simulate the greyshades. A variant exists: The line spacing can stay comfortably large, if a part of the lines have different direction (=crosshatching) Hatches where the varying line densities simulates the greyshades. The outlines of the shapes - often drawed, but they can be also left out if the forms are otherwise well recognizable ![]() The engravers seem to have four major line usage principles:
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