Telephone

Concept of the Telephone was born

1874

Alexander Graham Bell thought about a device that could transmit voice through electrical wires while he was creating the "multiple telegraph".

Discovery

1875

Along his accomplice Thomas Watson, Bell was able to prove that different tones were able to change the strenght of a electrical current.

Invention

1876

While working on the multiple telegraph, Bell was able to hear sound trough a wire and he noticed the potencial of the device. Later this year, he created and patented the telephone.