Aderscher telephone

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The Adersche telephone is an electro-acoustic telephone that has been further developed by Clément Ader .

Aderscher telephone (cross section)

functionality

In the Adler telephone, the ring-shaped horseshoe magnet aa also serves as a handle, and only the pole lugs bb with the induction coils are enclosed in the housing cc , which is covered with the membrane e and closed by the screwed-on mouthpiece dd .

The soft iron ring x is opposite the membrane on the outer side and is intended to increase the attractive force of the magnet. Since, however, the latter induces magnetism also in the soft iron ring, the stronger attraction of the membrane to one side is canceled out by the opposing force on the other side. This fact, which gives the membrane greater mobility, probably contributes much to the great clarity of the transmission achieved with the Adler apparatus.

With the help of the Adler telephone, the stereophonic transmission of music over a distance of two kilometers was achieved in 1881 .

See also

Individual evidence

  1. ^ Théodore du Moncel: The Telephone at the Paris Opera . Scientific American , December 31, 1881, pp. 422-423; accessed on March 9, 2008.

literature

  • Grawinkel: Textbook of Telephone and Microphone (2nd edition). Berlin 1884
  • Wietlisbach: Telephony technology . Vienna 1886