Ferret Out: phonography resources (2)

http://www.jimmeruk.com/ask-science-gimp/do-cups-and-string-work-as-a-telephone.html
http://inventors.about.com/library/inventors/bltelegraph.htm
http://www.recording-history.org/HTML/phono_technology1.php
http://americanhistory.si.edu/edison/ed_001.htm
http://en.wikipedia.org/wiki/Morse_code

http://inventors.about.com/library/inventors/blntelegraph.htm -- this one's good
http://inventors.about.com/od/bstartinventors/a/telephone.htm#Inventors -- this one's good too