The Telephone

This invention transmits speech electronically, through wires and was patented by Alexander Graham Bell in the 1870s.

- The telegraph and telephone are both wire-based electrical systems, and Alexander Graham Bell's success with the telephone came as a direct result of his attempts to improve the telegraph.

- Bell had extensive knowledge of the nature of sound and his understanding of music enabled him to see the possibility of transmitting multiple messages over the same wire at the same time.

- The telephone replaced the telegraph.

- In 1970, Motorola developed the cell phone (the size of a brick).

Now, we use digital cell phones that combine different kinds of communications technology including:
the phone, the camera, the internet and an MP3 player.