Communications · Vol. VI|Telephone|1876

Telephone

1876

A diaphragm, a magnet, a current that wiggles as a voice wiggles air. Bell’s 1876 patent is the famous one; others were close. The telephone did not invent long-distance speech. It invented a network of switching so any two subscribers could be a circuit. The switchboard, later the automatic exchange, is the real machine.

Alexander Graham Bell; competing claims by Meucci, Gray, Reis · United States (patent battle); many labs

How the mechanism is arranged

Sound moves a diaphragm; the diaphragm modulates a current; a distant diaphragm reconstructs the sound.

How it works

Sound moves a diaphragm attached to a transmitter that varies a current.
The varying current travels a wire.
A receiver turns the current back into motion of another diaphragm — sound again.

Why it mattered

Made conversation, not only code, a telecommunications product.
Built switching as an industry.
Prepared the later logic of the internet: connect any pair.

What it unlocked

For further study

Library of Congress, Bell papers. Patent and notebooks.
Bruce, Bell. Biography and priority debate.

Check

Why is a switchboard as important as a handset?