Mediaeval Church Vaulting, by Clarence
   Ward                              50873
     [Link: http://www.gutenberg.org/5/0/8/7/50873 ]
     [Files: 50873-0.txt; 50873-h.htm]
   Thanks to Chuck Greif, deaurider and the Online
   Distributed Proofreading Team at http://www.pgdp.net (This
   file was produced from images generously made available
   by The Internet Archive)
   Chuck