how have they changed over time? lets see!. who invented the telephone alexander graham bell, a...
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All About PhonesHow have they changed over time?
LETS SEE!
Who invented the telephoneAlexander Graham Bell, a Scottish born inventor, is the person most widely credited as the inventor of the electric telephone. However, earlier inventors of telephone-like devices may have been Antonio Mecci or even others before him. Bell was experimenting into improving the telegraph system so that multiple messages could be set simultaneously. However while working on the model, he discovered that speech could be heard over his harmonic telegraph system.
How Telegraphs Changed over timeCommunication has changed over many years. It developed from simple this like the telegraph system to a more complex structures such as wired telephones to very complex structures such as cell phones. As telephones evolved, people found it easier to communicate. Today modern technology allows people to talk without having wires attached ( hands-free). It now allows web surfing ad texting.
How phones impact the environmentTowers and antennas are sprouting up
everywhere, powering some one billion mobile phones worldwide. The radio waves transmit electromagnetic radiation(EMR) and there seems to be no where to hide. The health exposure vary in intensity from mild symptoms s to serious diseases. Some symptoms include insomnia, headaches, dizziness, nausea, memory problems…etc. Tower for mobile phones, digital television, kill several hundred birds each year. Cows experience still birth, and birth deformities which decrease human food.
How are they used dailyWith technology they allowed early 24-hour media access as children an teens go about their lives, the amount of time young people spend wit entertainment media as risen dramatically. Not just young people, but older people use phones for work. Social life, and networking. This can be positive and negative.
BibliographyWho invented the telephone? No author
given. http:// wiki.answers.com/Q/Who-invented-the-telephone. No ate given. September 8, 2010
How Telephones Change. No author given. http://library.thinkquest.org/30112389/how. Telephones. Change.htm. O date given. September 8,2010
The Truth About Cell Pones. Hope Fauna. http :// www.living-foods.com/articles/celltruth.html. December 2002. September 14,2010