First Successful Test of Telephone

In today’s world, there is no one who hasn’t heard of the telephone. The inventor of the telephone is Alexander Graham Bell. The telephone is one of the most important inventions in history that has changed the world. It made the world shorter by allowing long distance bidirectional communication. Today we can see the wireless telephone(i.e mobile) in everybody’s hand. The invention of the telephone was the culmination of work done by many individuals and led to an array of lawsuits relating to the patent claims of several individuals and numerous companies. The first telephone was invented by Antonio Meucci, but Alexander Graham Bell is credited with the development of the first practical telephone.

Alexander Bell made his first successful bi-directional transmission on 10 March ‘1876’. The speech he transmitted in this test was “Mr. Watson, come here! I want to see you!”. He made this transmission using a liquid transmitter his own electromagnetic receiver.

Bell's telephone transmitter (microphone) consisted of a double electromagnet, in front of which a membrane, stretched on a ring, carried an oblong piece of soft iron cemented to its middle. A funnel-shaped mouthpiece directed the voice sounds upon the membrane, and as it vibrated, the soft iron "armature" induced corresponding currents in the coils of the electromagnet. These currents, after traversing the wire, passed through the receiver which consisted of an electromagnet in a tubular metal can having one end partially closed by a thin circular disc of soft iron. When the undulatory current passed through the coil of this electromagnet, the disc vibrated, thereby creating sound waves in the air.

This invention has developed a lot and is more advanced and complex. It can be easily carried in the pocket and provides a lot of function but it was impossible if the first telephone was never invented.