May 24, 1844
Samuel F.B. Morse sent the first telegraph message from the Capitol in Washington to Baltimore on May 24, 1844. The words sent were “What hath God wroght?”
The development history of Morse Code is nicely set out on Wikipedia, click here
Want to listen to Morse Code? Click here
Even better, click here to get to a Morse Code translator. Type your message into it, then listen to your message in Morse Code.
“Google” in Morse Code, sent by Google on April 27, Samual Morse’s birthday:
Samuel Finley Breese Morse