What does acoustic telegraphy mean?

Definitions for acoustic telegraphy
acous·tic teleg·ra·phy

This dictionary definitions page includes all the possible meanings, example usage and translations of the word acoustic telegraphy.


  1. Acoustic telegraphy

    Acoustic telegraphy was also known as harmonic telegraphy. During the late 19th century, inventors developed methods of multiplexing telegraph messages simultaneously over a single telegraph wire by using different audio frequencies or channels, for each message. A telegrapher used a conventional Morse key to tap out the message in Morse code. The key pulses were transmitted as pulses of a specific audio frequency. At the receiving end a device tuned to the same frequency resonated to the pulses but not to others on the same wire. Inventors who worked on the acoustic telegraph included Charles Bourseul, Thomas Edison, Elisha Gray, and Alexander Graham Bell. Their efforts to develop acoustic telegraphy, in order to reduce the cost of telegraph service, led to the invention of the telephone. Some of Thomas Edison's devices used multiple synchronized tuning forks tuned to selected audio frequencies and which opened and closed electrical circuits at the selected audio frequencies. Acoustic telegraphy was similar in concept to present-day FDMA, or Frequency Division Multiple Access, used with radio frequencies. The word acoustic comes from the Greek akoustikos meaning hearing, as with hearing of sound waves in air. Acoustic telegraphy devices were electromechanical and made musical or buzzing or humming sound waves in air for a few feet. But the primary function of these devices was not to generate sound waves, but rather to generate alternating electrical currents at selected audio frequencies in wires which transmitted telegraphic messages electrically over long distances.

The Standard Electrical Dictionary

  1. Acoustic Telegraphy

    The system of sound-reading in telegraphy, universally used in the Morse system. The direct stroke of the armature of the electro-magnet and its "back stroke" disclose to the ear the long and short strokes, dots and lines, and long and short spaces as produced by the dispatcher of the message. In the Morse system a special magnet and armature is used to produce the sound called the "sounder;" in other systems, e. g., Steinheil's and Bright's apparatus, bells are used. (See Alphabets, Telegraphic.)

How to pronounce acoustic telegraphy?

How to say acoustic telegraphy in sign language?


  1. Chaldean Numerology

    The numerical value of acoustic telegraphy in Chaldean Numerology is: 2

  2. Pythagorean Numerology

    The numerical value of acoustic telegraphy in Pythagorean Numerology is: 1


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"acoustic telegraphy." Definitions.net. STANDS4 LLC, 2024. Web. 24 May 2024. <https://www.definitions.net/definition/acoustic+telegraphy>.

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