Photo-engraving, by W. T. Wilkinson 52378 [Full title: Photo-engraving, Photo-etching and Photo-lithography in Line and Half-tone] [Subtitle: Also Collotype and Heliotype] [Editor: Edward L. Wilson] [Link: http://www.gutenberg.org/5/2/3/7/52378 ] [Files: 52378-0.txt; 52378-h.htm] Thanks to Chris Curnow, RichardW, and the Online Distributed Proofreading Team at http://www.pgdp.net (This file was produced from images generously made available by The Internet Archive) David