Bell Invents the Telephone, 1876

quick facts:

1. The first message spoken over the phone was "Mr. Watson--come here--I want to see you."
2. Mr. Watson and Mr. Bell were the first people to make a transcontinental call on January 15, 1915
3. When a person speaks into the mouthpiece of a phone, the acoustic vibrations from his speech push the metallic coating closer to the electrode, creating variations in voltage and a conversion.

A photo of Alexander Graham Bell.

A drawing on how the telephone works.