1920s

---

1923

Vladimir Zworykin, a follower of Rosing, patents the iconoscope, a tube-shaped device capable of capturing images and turning them into electronic signals.

1926

John Logie Baird offers the first public demonstration of a mechanical television system based on the Nipkow disc capable of transmitting remote images.

>> Watch video Baird Television.

1927

Philo Farnsworth performs the first public demonstration of an electronic television system with image dissector tube, very similar to Zworykin's iconoscope.

1929

BBC makes its first experimental broadcast with a television system of 30 lines and 12.5 images per second.