DEJANA COATES MS. BORNFRIEND PD:1 Telephones

Table of Contents Summary Question #1 Photo #1 Question #2 Photo #2 Question #3 Photo #3 Question #4 Photo #4 Timeline Bibliography Summary Question #1 Photo #1 Question #2 Photo #2 Question #3 Photo #3 Question #4 Photo #4 Timeline Bibliography

Summary The topic I chose was telephones. Alexander Graham Bell was the inventor of the telephone. Telephones were invented in the 1870s. They are devices that could transmit speech through electricity. The people communicate has changed as time progressed; for instance, it started with writing letters and then to telegraphs and then to telephones.

#1. Who invented the telephone? The inventor of the telephone was Alexander Graham Bell. Other people claim that they invented the telephone, and there was a big feud of who created them. Bell was first to patent the telephone.

#2. When were telephones invented? Telephones were invented in the 1870s. They are devices that can transmit speech through electricity. Telephones were invented in the 1870s. They are devices that can transmit speech through electricity.

#3. How has they changed? The way people communicate has changed so much over time. It started with writing letter, then to telegraphs, then to telephones. When people wrote letters it use to take a long time for the letter to get to where its going. So they had to come p with ways that wouldn’t take as long.

#4. How are telephones useful to society? Telephones allow people to better communicate. And it’s helpful in case of emergency or keeping in touch with your family and friends. Uses of the telephone: Voic Text messaging Live chat Scheduling & etc… Telephones allow people to better communicate. And it’s helpful in case of emergency or keeping in touch with your family and friends. Uses of the telephone: Voic Text messaging Live chat Scheduling & etc…

Timeline 1900 Telephone transmission extends across and between major cities 1904 Fleming invents the vacuum diode 1915 First transcontinental telephone call 1919 Switching systems and rotary-dial telephones 1920 Frequency multiplexing concept 1947 North American Numbering Plan 1948 A Mathematical Theory of Communication 1949 First phone to combine a ringer and handset 1951 Direct long distance calling first available 1956 First transatlantic telephone cable 1962 First commercial digital transmission system 1962 Telstar Touch-tone telephone is introduced 1965 First electronic central office switching system 1968 First 911 call is made 1973 First portable cell phone call is made 1975 U.S. military begins using fiber optics 1976 Common channel interoffice signaling 1978 Public tests of a new cellular phone system 1990s (Mid) Voice Over Internet Protocols million cellular telephone subscribers 1900 Telephone transmission extends across and between major cities 1904 Fleming invents the vacuum diode 1915 First transcontinental telephone call 1919 Switching systems and rotary-dial telephones 1920 Frequency multiplexing concept 1947 North American Numbering Plan 1948 A Mathematical Theory of Communication 1949 First phone to combine a ringer and handset 1951 Direct long distance calling first available 1956 First transatlantic telephone cable 1962 First commercial digital transmission system 1962 Telstar Touch-tone telephone is introduced 1965 First electronic central office switching system 1968 First 911 call is made 1973 First portable cell phone call is made 1975 U.S. military begins using fiber optics 1976 Common channel interoffice signaling 1978 Public tests of a new cellular phone system 1990s (Mid) Voice Over Internet Protocols million cellular telephone subscribers

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Bibliography (continued…) _Graham_Bell_in_colors.jpg/ /Alexander_Graha m_Bell_in_colors.jpg _Graham_Bell_in_colors.jpg/ /Alexander_Graha m_Bell_in_colors.jpg ages/novelty_telephones.jpg ages/novelty_telephones.jpg Knowledge/images/One-of-the-Varied-Types-of-Desk- Telephones-Used-in-France.jpg Knowledge/images/One-of-the-Varied-Types-of-Desk- Telephones-Used-in-France.jpg ne/timeline_color.jpg ne/timeline_color.jpg