Engraving and printing methods, advertisement illustration, technical- and trade-paper advertising, street-car advertising, outdoor advertising, house publications (1909)
Scranton : International Textbook Co. · leaf 20
andweaken the higher parts, the plate is taken out severaltimes during the process and additional chemical treatmentis given the parts to be protected. After the acid has doneits work, various parts of the plate are cut, or routed,deeper by machinery if necessary. A study of Figs. 3, 4, 5, 6, 7, 8,… … Fig. 8Routed after third bite been made unusually broad and the thickness of the plateexaggerated in order to make the etching process clear.Fig. 3 shows the section after the first bite made by the acid.Figs. 4, 5, 6, 7, 8, and 9 show the section in successivestages, until the cut is mounted on a…
