Social Studies Activity Worksheet
Download 3.99 Mb.
|
- Navigate this page:
- Social Studies Activity Worksheet
|
Less than a month after the development of the new code, Morse demonstrated the new telegraph to the President and Cabinet in Washington, DC. He attempted to persuade Congress to pass a bill to spend $30,000 to bury a telegraph line from Washington, DC to Baltimore, Maryland. However, the resolution to construct the line would not be passed until early 1843, and the eventual decision was to place the lines on the top of chestnut poles 24 feet high as opposed to burying them in a pipe. Once the construction of this line was finished, the first public city-to-city telegraph transmission of "What hath God wrought" was sent to usher in the new age of communication. Since the new communication system had the full support of the United States Congress, telegraph lines were quickly established between all major United States cities, spanning from Nova Scotia to Louisiana, and eventually spanning westward with the railroads. By the time the telegraph had reached California, it had connected nearly every corner of the country and brought the country one step closer to unity. Guglielmo Marconi and the Wireless Telegraph When he was only 19 years old in 1895, Guglielmo Marconi b  egan experiments in his father’s country estate in Italy and eventually succeeded in sending wireless telegraph signals over a distance of approximately one and a half miles. In doing so, Marconi took the work of Samuel Morse one giant step further and invented the first practical wireless telegraph system. His device, known simply as the "Marconi," was within 4 years being used for communication across the English Channel, and less than 2 years after that was redesigned to be powerful enough to send a communication 2,100 miles across the Atlantic Ocean. In 1907, the oceanic barrier was officially destroyed with the opening of the first commercial trans-Atlantic wireless communication service between Glace Bay, Nova Scotia, and Clifden, Ireland.
Communication using the Marconi device not only had wide terrestrial-based uses, but also possessed great maritime capabilities as well. After 1907, it was possible for a ship bearing a Marconi antenna to transmit messages to a receiving station on shore, thousands of miles away. This greatly improved the safety of sailing across the ocean, as a ship in distress could signal out a "C. Q. D.," or universal distress call, and any ship in range was required by international rules of sailing to offer any assistance it can within its capabilities. In April of 1912, when the Royal Mail Steamer ‘Titanic’ struck an iceberg and sank, it was argued that a nearby ocean liner was in close enough range to recover passengers before the ship went under, however the Marconi operator had sadly turned off his radio for the evening and never heard the call for help. This disastrous event sparked controversy which resulted in new rules for Marconi operators, such as a new requirement that the Marconi be manned 24 hours a day while at sea. After the development of the wireless radio system, Marconi returned to research on newer and more advanced methods of wireless communication. Experimenting with shorter wavelengths, Marconi discovered that he could use the combination of a short wavelength signal and a special style antenna to send a "beam" signal a much longer distance while using much less energy than with the traditional wire system. Perfected in 1923, the system was opened for commercial use between England and Canada in 1926. In 1934, after several years of research on microwave radio signals, Marconi developed and successfully demonstrated the ability to use a microwave radio beam as a vector navigation aid, and in the following year gave yet another practical demonstration of microwave radio signals, this time for a more practical and useful purpose. He proposed that by employing the principles of reflecting radio waves, you can detect the presence of large objects by listening for the corresponding "echo" of the radio burst you send out. This demonstration was the first practical application and successful implementation of radar, whose principle is still in use today on virtually every vessel at sea. While Samuel Morse and Guglielmo Marconi both developed systems which rely on signals being transmitted in on/off, or binary form, later inventors would take this on/off system a step further and expand it to include varying signal strengths, thus giving birth to the telephone. http://www.personal.psu.edu/users/e/m/emr150/group.html Social Studies Activity Worksheet
Directory: media -> supo -> docs -> supodocs media -> Tsunami Terror Alert: Voices of Youth media -> Biblical Eschatology Presentation by: D. Paul Beck May 4, 2016 Ground Rules media -> Guide to completing the collection using the Omnibus system media -> The milk carton kids media -> Events Date and Location media -> The Gilded Age: The First Generation of Historians by H. Wayne Morgan University of Oklahoma, April 18, 1997 media -> Analysis of Law in the United Kingdom pertaining to Cross-Border Disaster Relief Prepared by: For the 30 June 2010 Foreword media -> Cuba fieldcourse 2010 supodocs -> Social Studies Assessments Sixth Grade 1 Explain why and how historians use eras and periods as constructs to organize and explain human activities over time supodocs -> United States History Assessments Ninth Grade Download 3.99 Mb. Share with your friends:
| ||||||||||||||||||||||||||||||||||||||||||||