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The Telegraph
By: Micah Collins
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Table of Contents
• The Two Different Telegraphs
• How the Telegraph Works
• The Parts of the Telegraph
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The Two Different Telegraphs
• There were two types of telegraphs.• One built by Samuel Morse.• The other by Cooke and Wheatstone.
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The Two Different Telegraphs (Continuation)
• Cooke and Wheatstones telegraph was difficult to use and costly to install.
• Thus, Morse’s telegraph prevailed.
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How the Telegraph Works
• Morse code is the “code’ that telegraph messages are in.
• Morse code was invented by Samuel Morse.• It is basically a bunch of dots and dashes.
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How the Telegraph works (Continuation)
• A special pen wrote the pulses it received in Morse code on a strip of paper.
• As a sender taps out a word, the machine completes a circuit and sends the message.
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The Parts of the Telegraph
• The operating handle is moved left or right to select symbols to send in the message.
• The receiver needle display also moves left or right to show the message it received.
• The needle display used to have a special alphabet on it, but it eventually used Morse code.
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The Parts of the Telegraph (Continuation)
• The electromagnetic coil controls the needle display in front of it.
• It sits on a pivot so it could swing left or right depending on which way the electric current flowed.
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Conclusion
• The telegraph is a complex and difficult machine to use.
• Before you could use one, you would have to learn Morse code, learn how to use each part, and know what king of telegraph you are using.
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Bibliography• Scarbrough,Mary. Long-Distance Communication. San Diego: Black Birch
Press, 2004• Tomecek, Stephen, and Dan, Stuckenschneider. What a Great Idea!
Inventions that Changed the World. United States: Scholastic Inc. 2003.
• “How the Telegraph Works.” Connected-Earth. 9 May, 2013 http://connected-earth.com/learningresources/Howitworks/telegraph/Howthetelegraphworks/index.htm