Resources

Created by The History Channel, here is a link to a good video of the why and how of the telegraph, featuring
Len Bruno of the Library of Congress. 

This picture book is about a young boy using Morse code
in the 1920's for a real live rescue. Radio Rescue is by
Lynne Barasch. Her website is www.lynnebarasch.com.

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The development of the telegraph and how it changed the world are given in this Elon University site.

This history of Morse code and the telegraph is by Billy Miller, a student at 
the College of Wooster in 2015. The bibliography is instructive.

Other useful sites

 The Electric Telegraph,
1838-1922