The Mentor: Great American Inventors, by H. Addington Bruce 49893 [Full title: The Mentor: Great American Inventors, Vol. 1, Num. 29, Serial No. 29] [Link: http://www.gutenberg.org/4/9/8/9/49893 ] [Files: 49893-0.txt; 49893-h.htm] Thanks to Juliet Sutherland and the Online Distributed Proofreading Team at http://www.pgdp.net David