Invention of Telephone

Alexander Graham Bell was invent the telephone in march 10, 1876. He was bron in March 3, 1847 in edinburgh,Scotland.Alexander Graham bell educated in elecution and the correction of speech.Bell was a professor in Boston University vocal physiology. His knowledge on nature of sound helped him to teach to deafs.That knowledge lead him the invention of the telephone.

He made a instrument which covert the human voice to electrical impulses of various frequencies and then back to the sound we talk. It consisted of wooden stand funnel and cap of acid and copper wires. First Voice "Mr. Watson, come here. I want to see you". These famous first words was told to his assistance Mr. Watson in the next room to him.

Electromagnetism was invented by Hans Christian Oersted. Elctromagnets is a major component of telephone. He showed, that current carrying conductor produces a magnetic field.

Michael Faraday discovered that a changing magnetic field procuces or induce current. This is the discovery of modern electricity. This was the revers of the electromagnetism whch was invented by Christian Oersted. Michael

Faraday Knowledge as fathere of modern electricity and he was able to build the first electric generator in the world.

Joseph Henry showed that an electriomagnet with current attracted an iron rod turn a bell.

Heinrich Hertz was shown the existance of the radio waves.

Guglielmo Marconi introduce wireless communication by using radio waves in to the world.

Thomas Alva Edison invent the corbon transmitter.

Vacuum tube was build by Lee de Forest. It was help to develop national telophone system, because communication services suffer form energy loss during long distance transmit. First telephone line was opened between San Francisco and New York by using vacuum tube repeater and that made sucess the long distance communication.

William Shockley, Walter Brattain and Jhon Bardeen was invented the trnssistor. Vacume tube was not efficient and more expensive. Vacume tubes in telephone network was replace by the transistors.

Robert Kech, Robert Maurer and Peter Schultz were developed the optical fiber. This development create a revolution in telecommunication.