Spelling error in posting note title line corrected: Scientific American, July 14, 1877, by Various 38481 [Full title: Scientific American, Vol. XXXVII.--No. 2. [New Series.], July 14, 1877] [Subtitle: A Weekly Journal Of Practical Information, Art, Science, Mechanics, Chemistry, And Manufactures] [Link: http://www.gutenberg.org/3/8/4/8/38481 ] [Files: 38481.txt; 38481-8.txt; 38481-h.htm] Thanks to Juliet Sutherland, Lesley Halamek, and the Online Distributed Proofreading Team at http://www.pgdp.net David