Acoustics of auditoriums, by F. R. Watson
   70013
     [Subtitle: University of Illinois Bulletin, Vol. XI, March 16, 1914,
   No. 29]
     [Author: F. R. Watson]
     [Link: [1]https://www.gutenberg.org/7/0/0/1/70013]
     [Files: 70013-0.txt; 70013-h.htm]
   Thanks to Charlie Howard and the Online Distributed Proofreading Team
   at
   [2]https://www.pgdp.net (This file was produced from images generously
   made
   available by The Internet Archive)
   Regards,
   Jacqueline

References

   1. https://www.gutenberg.org/7/0/0/1/70013
   2. https://www.pgdp.net/