Telephones - Bibha, Sanya and Jie

by vinnies6
Last updated 8 years ago

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Telephones - Bibha, Sanya and Jie

Telephones - Developments over time

> Invented by Sir Alexader Graham Bell in 1876> Were connected only to each other, but as the numbers increased, each telephone was connected to an exchange

> Voice used to travel along wires initially;> Now calls travel through radio waves through satellites;> Technology developes and today mobiles/cordless phones are more popular

http://www.youtube.com/watch?v=gV9Ea2ylE3oposter yourself


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