How television works

The scanning and reproducing disc are similar, both are mounted on driving, motors and each is punched with a spiral of small holes along the outer edge. The number of holes matches the number of lines of pictures definition. Radio waves yes our old friend radio strikes again, the radio waves that carry television pictures to you are the exact same radio waves that carries the news to your car the only difference is the type of information they are carrying. In conventional broadcasts radio waves carry a sound or audio signal. In early cameras, various forms of special tubes were used, the tubes had a special layer that was scanned that was sensitive to light, and us this layer was scanned by an electron beam, the image that was focused on the tube converted to an electronic voltage, witch corresponded to the brightness of the image, modern cameras use solid state derives that do essentially the same thing color images are sent in the way. Except that there must be a signal for each of the primary colors use.
The Iconoscope was the camera pick-up tube that was most commonly used in 1939 TV cameras. It was the eye of television. Inside the Iconoscope, the image is projected into a photosensitive plate and scanned by an electron beam, breaking the elements of the image into a series of electrical impulses. These impulses can be transmitted as a radio signal to a TV set.
The receiver contains a picture tube (kinescope). The kinescope tube creates another electron beam witch varies in intensity while being magnetically deflected vary rapidly. When this beam strikes the back of the phosphor coating inside the kinescope, each spot glows for a split second, until the beam has a chance to return for the next pass.
“Persistence of vision” means that the brain retains an image for one tenth of a second after the eye perceives it. The rapid repetition of moving images (in film or television) tricks the brain into perceiving continuous images.