• Year
  • 1932
  • Category
  • Television-Camera (Broadcast, professional) and studio engineering
  • Radiomuseum.org ID
  • 317178

 Technical Specifications

  • Main principle
  • Special principle (see notes)
  • Power type and voltage
  • Alternating Current supply (AC) / 250 Volt
  • from Radiomuseum.org
  • Model: Televisor Camera - Bell’s Inventions Ltd.; Perth,
  • Notes
  • Description of the protype Televisor Camera incorporating transmitter;

    Televisor camera differs from those of other experimenters in several different ways, but the first to appeal is that of size, for the whole of the apparatus is contained in a metal cabinet about half as big again as a biscuit tin and weighing about 25lb. The image or scene to be televised is focused through a quick adjusting lens on to a vertical plane, and by means of a mask only a certain amount of light is allowed through. The actual size of the image allowed through is approximately the size of an ordinary "frame" of a motion picture. On passing the mask the light impinges on a rotary drum about 12 inches in diameter, which is pin pricked with holes around the circumference. Many experimenters John Bell says have used a scanning disc which travels at right angles to the beam of light carrying the image, but in his apparatus the drum travels in the same direction in which the light is coming. When the light strikes the rotating drum, it travels through the perforations and is picked up by a photo-electric cell. This cell, which has the property of converting light variations into electrical variations, creates a wave which follows the lights and shades of illumination of the image televised. From the cell the image, which is now an electrical impulse, is efficiently amplified, and is capable of being passed from there to any inter-mediate amplifier or radio transmitter, and then broadcast. What is the most successful wavelength to use he cannot say   it may be a matter of test, but he has an idea that five metres may prove successful for transmissions over the distance of sight range from a transmitter.

    from The Daily News (WA) August 25, 1932, Page 6.
    Text sourced  from Trove – National Library of Australia

  • Mentioned in
  • -- Original prospect or advert (The Daily News (WA) August 25, 1932, Page 6.)
  • Author
  • Model page created by Gary Cowans. See "Data change" for further contributors.

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