Telegrams Ride the Tones of Electric Organ (Oct, 1938)

Telegrams Ride the Tones of Electric Organ

Telegraph engineers have learned from the electric organ how to send ninety-six telegraphic messages in one direction over a single wire at the same time. They borrowed from the Hammond organ the idea of dispatching multiple messages on different tone pitches. To demonstrate how the organ generator functions in such a telegraphic system, Western Union engineers installed an organ console next to a bank of carrier channel equipment and used a “tone detective” which, by a series of clefs on the musical scale, showed the frequencies of the tones produced on the organ and the tones being used by the generator for the telegrams.

4 comments
  1. Stannous says: January 22, 200810:49 am

    Primitive ring-tones?

  2. Mike says: January 22, 20087:01 pm

    Sounds like the beginning of DTMF:

    http://en.wikipedia.org…

    To think, we could have had touch-tone dialing in 1938…

  3. LWATCDR says: January 23, 20081:33 pm

    Actually it is frequency division multiplexing.
    http://en.wikipedia.org…

  4. Har says: March 19, 20086:28 am

    I think it’s more like DSL broadband technology.

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