Practical instruction in the art of wood engraving : for persons wishing to learn the art without an instructor : containing a description of tools and apparatus used, and explaining the manner of engraving various classes of work : also, a history of the art, from its origin to the present time (1876)
Emerson, William A. (William Andrew), 1851- · East Douglas [Mass.] : C.J. Batcheller · leaf 52
42 WOOD ENGRAVING. in mind that cutting away and weakening the color in the features cannot be easily remedied, but if the parts are too dark they can be readily lightened. To be a suc- cessful portrait engraver, ones whole time and attention should be given to this branch of the Art. Fig. 51.
Wood-engraving
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.