1890's: Inventors of the Radio

- In the 1890s, four inventors concurrently worked on wireless transmission and detection:

1) Edouard Branly, French Physicist.

* Invented a signal detector known as a "coherer" that consisted of a glass tube full of metal filings.

* The "Coherer" reacted when a sign was detected.

2) Oliver Lodge, English Physicist.

* He worked on the principle of resonance tuning.

* The principle of resonance tuning allowed the transmitter and receiver to function at the same frequency.

3) Alexander Popoff, Russian Physicist.

* He evolved a better coherer and a vertical-receiving antenna.