Electron Camera “Shoots” Television Images – London Station to Serve Ten Million People (Jun, 1935)

|<<
<< Previous
1 of 2
|<<
<< Previous
1 of 2

Electron Camera “Shoots” Television Images – London Station to Serve Ten Million People

Television Will Be Made Available to 10,000,000 People This Year by a London Station Which Will Alternate the Baird and Marconi Systems of Transmission; the Baird System Uses Four Types of Transmitters; the Intermediate Film Apparatus Records Both Sound and Scene on One Film, Which Is Projected through a Lens by Light from an Arc onto a Photo-Electric Cell Which Converts the Light Impulses into Electrical Impulses for Transmitting by Short-Wave Radio; a Tele-cine Disk Transmitter Accommodates Ordinary Sound Films and a Spotlight Transmitter, Used for Close-Ups, Projects a Spot of Light onto the Person Being Televised, This Spot Traveling Rapidly over Face and Figure; Reflected Shades of Light Impinge on Photo-Electric Cells Which Convert the Light Tones into Electrical Impulses That Are Amplified and Sent by Radio.

The Electron Camera Is the Greatest Advance in This System of Transmission; It Has No Moving Parts; the Scene Is Recorded through a Camera Lens and Impinges on a Photo-Electric Plate for Conversion into Electrons; the Electrons Are Vibrated, Pass a Small Aperture, Strike a Metal Pin-head, and Set Up Minute Electrical Impulses Varying with the Light Tones Received; These Are Broadcast by Ultra-Short Waves and Reconverted into the Scene Televised; the Cathode-Ray Tube Is Used in the Latest Type of Home Receiver; It Receives the Signals at Its Narrow End and Fires Them in a Stream of Electrons onto a Disk-Electrode; an Anode Directs the Stream onto a Fluorescent Screen at the Wide End of the Tube and as the Electrons Strike the Screen, They Become Points of Light and, with Great Rapidity, Reconstruct the Picture

5 comments
  1. Hirudinea says: August 28, 20121:27 pm

    The Baird system was mechanical television, which lost out the to the electronic system, the Marconi, and I believe the electronic system lasted in Britain as the 405 line VHF system until 1985!

  2. Stephen says: August 29, 20123:09 am

    The “travelling spot” system is strikingly similar to the scanning electron microscope, which does exactly the same thing with an electron beam. @Hirudinea: the 405 line system used Phil T Farnsworth’s image-orthicon (spelling?) tube in the cameras, not the Marconi system described here. It was broadcast on VHF and though it may have gone on into the 1980s, by 1970 or so all the channels were available in the 625-line system which, now digitised, is still going today.

  3. jayessell says: August 29, 201212:30 pm

    Several great videos of the BBC TV broadcasts of 1936 at YouTube.
    Search for The Race For Television, the Discovery of Television, Television Comes to London, “The Fools on the Hill”‘ ect.

  4. JMyint says: August 30, 20128:30 am

    The Farnsworth system is indeed what became known as television worldwide. It was superior to all other competing systems and formed the basis for NTSc, PAL, and SECAM.

  5. Casandro says: September 2, 201211:01 pm

    @JMyint, actually NTSC, PAL and SECAM don’t specify how the scanning is done, so different scanning systems cannot be the bases for such systems. In fact in some countries there are even TV shows which are completely done electronically. “Pages from Ceefax” is the prominent example from the BBC. It is a television show which is completely electronically generated.

Submit comment

You must be logged in to post a comment.