How far did a telegraph signal carry?
Wires allowed an electric current to flow as far as the wires stretched. However, they were usually broken at stations or towns, where message recipients were located. The message was forwarded on from that point.
Morse Code advanced communication by light years. Sam Morse used electromagnets to develop his code in 1837 to communicate with the telegraph. His code of dots and dashes corresponded to letters of the alphabet.
The advent of the telephone in 1877 eventually brought about the decline of the telegraph. The Morse Code, though, opened the door to electronic and digital mass media revolutions. No other development since printing has impacted our daily lives as much.
Marshall Trimble is Arizona’s official historian and vice president of the Wild West History Association. His latest book is Arizona Outlaws and Lawmen; The History Press, 2015. If you have a question, e-mail him at firstname.lastname@example.org