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T h e T e l e g r a p h

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axelle
10 diapositives · 539 Views · Jul 27, 2014

T h e T e l e g r a p h. By: Micah Collins. Table of Contents. The Two Different Telegraphs How the Telegraph Works The Parts of the Telegraph. 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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  1. TheTelegraph By: Micah Collins

  2. Table of Contents • The Two Different Telegraphs • How the Telegraph Works • The Parts of the Telegraph

  3. The Two Different Telegraphs • There were two types of telegraphs. • One built by Samuel Morse. • The other by Cooke and Wheatstone.

  4. The Two Different Telegraphs (Continuation) • Cooke and Wheatstones telegraph was difficult to use and costly to install. • Thus, Morse’s telegraph prevailed.

  5. 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.

  6. 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.

  7. 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.

  8. 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.

  9. 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.

  10. 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. 9May, 2013 http://connected- earth.com/learningresources/Howitworks/telegraph/Ho wthetelegraphworks/index.htm