CHAPTER 1 IMAGES ON A SCREEN Philo Farnsworth was an inventor He designed the first electronic TV Many inventors worked to create TVs in the early 1900s People had been using radio waves to send sound through the air WATCH A VIDEO HERE 4
5 since the late 1800s But they wanted to send images too Philo's TV top was based on technology used by the radio bottom
Mechanical TVs used spinning discs to send signals Many early TVs used spinning discs Each disc had several holes A lamp shone through the holes to create and send images This method was known as mechanical television But sending images 6
this way was slow And the discs could be quite large DID YOU John Logie Baird showed the first image on a mechanical television in 1925 KNOW John Logie Baird shows how an early TV works 7
