Chapter 16: Sectional Differences "Shock Wave" Introduction      In this chapter, you learned about the remarkable advancements in communications during the early 1800s, including the development of the telegraph. Log onto the Internet to learn more about the exciting discoveries made in this field in the years before the Civil War. Destination Title: The Sparks Telegraph Key Review Note: Clicking on the link above will launch a new browser window. Need help using your browser for this activity? Click here for tips. Directions Start at the Sparks Telegraph Key Review home page. Read the text and examine the diagrams. Answer the following questions. 1. According to the pyramid diagram, to what did the various developments in electricity eventually lead? 2. Why did inventors set out to create the wireless telegraph? 3. Why was the early wireless telegraph known as "the spark"? 4. Scroll down to the inventors' box. Test your knowledge of inventors by attempting to match the inventor with his invention. Then click on each inventor's name to check your answer.