Presentation on theme: "Alexander Graham Bell By Hannah Jennings And his Invention of the Telephone And his Invention of the Telephone."— Presentation transcript:
Alexander Graham Bell By Hannah Jennings And his Invention of the Telephone And his Invention of the Telephone
Alexander Bell Born on March 3rd, 1847 in Scotland Educated the deaf 1878 invented the telephone 1878 founded the Bell telephone company
Alexander Bell Volunteered for the deaf for many years Earned the Volta Prize for his invention Established the Alexander Graham Bell Association for the deaf Died on August 2nd, 1922
The Telephone Four Main Parts: 1). Dialing Mechanism 2). Transmitter 3). Ringer (inside) 4). Receiver 2). 4). 1). 3).
Dialing Mechanism On the handset, or base of phone Has set of buttons or keys called a key pad Older telephones had rotating keypad called rotary dial The computer recognizes the tone each key produces, and dials it
Sending Signals The speaker’s voice travels through an electric current The current goes from the transmitter to the hook switch Then from there, it goes to the wall jack The wall jack sends the signal into the telephone network
Telephone Networks Signal leaves the house and goes to a telephone box
Telephone Networks From the box to the telephone pole, and from the pole to the local exchange
Telephone Networks An exchange is a building that is connected to all the telephone poles in the area. It connects the incoming call with the number that was dialed
Telephone Networks From the local exchange, to the main exchange, from there to the international exchange The main and international exchanges serve the same purpose as local, except they are connected to the smaller exchange buildings It then goes in the backwards order to the other telephone
Telephone Networks Telephone Boxes Telephone Poles Local Main
Cell Phones Mobile devices that transmit and receive radio signals Communicates through an antenna transmitter Transmitter serves a single geographic area called a cell
Cell Phones The cell connects with a regular telephone network It has the same basic parts of a telephone
Telephones in Remote Areas Too expensive to run wires to low populated areas BETRS fills in the “gap” (Basic Exchange Telephone Radio Service) Each house has a transmitter that sends radio signals to the telephone exchange
BETRS Telephone Transmitter Radio Signals Telephone Exchange
About the Author I am Hannah Jennings. I did the telephone because I like to talk on it. I am 12 years old, and in the 7th grade. I live in Winston- Salem, North Carolina.
Bibliography “Alexander Graham Bell- Biography.” What you need to know ABOUT. June, 2003. 4/26/2004. Http://inventors.about.com/library/inventors/ bltelephone2.htm. Brian, Marshall. “How Telephones Work.” How Stuff Works. 4/29/2004. Http://electronics.howstuffworks.com/ telephone.htm
Bibliography Brodsky, Arthur. “Telephone.” The World Book Encyclopedia.(volume 19). 2003. World Book Inc. April 27, 2004. Hounshell, David, A. “ Bell, Alexander Graham.” The World Book Encyclopedia (volume 2). 1999. World Book Inc. April 27,2004.