Pressed down, the electricity passing over the wire to Denver presses
the point there down on the paper, and so makes a dot or dash which
stands for a letter on the roll of paper as it passes under it. In this
way words and messages are spelled out. The message on the strip of
paper above is the question, _How is trade?_] 228. Summary.--Professor
Morse invented the Electric Telegraph. He received much help from Mr.
Alfred Vail. In 1844 Professor Morse and Mr. Vail built the first line
of telegraph in the United States, or in the world. It extended from
Washington to Baltimore. The telegraph makes it possible for us to send
a written message thousands of miles in a moment; by the telephone,
which was invented after Professor Morse's death, we can talk with
people who are several hundreds of miles away and hear what they say in
reply. Tell how they sent the news of the completion of the Erie Canal.
What did Samuel Morse say to himself? Tell about Morse