The Story of Great Inventions, by Elmer Ellsworth Burns 37609 [Link: http://www.gutenberg.org/3/7/6/0/37609 ] [Files: 37609.txt; 37609-8.txt; 37609-h.htm] Thanks to Anna Hall, Albert László, Matthew Wheaton and the Online Distributed Proofreading Team at http://www.pgdp.net Many thanks Janet