English: Coherer
radiotelegraphyreceiver designed by the French inventor Auguste Jean-Baptiste Tauleigne (1870-1926) around 1914. This was used to receive radiotelegraphy text messages in from a
spark-gap transmitter. The
coherer which detected the radio signals from the wire antenna, a horizontal glass tube with metal powder between two electrodes, is visible at right. The radio signal caused the metal powder to become conductive, allowing current from a battery (not visible) to flow through it to register on the siphon recorder. The siphon recorder (left) recorded the Morse code as an ink line on a paper tape, which could be translated later into text by an operator. Alternately the code could be listened to using the
headphones (right). A bell (right) was provided to alert the operator when a message was coming in.
Français : Receveur de télégraphes conçu par le physicien français
Auguste Jean-Baptiste Tauleigne (1870-1926) A droite, le relai avec lequel on tape le message. Au centre, les écouteurs. A gauche, la partie enregistreuse de l'appareil : les points et traits du message en Morse sont imprimés sur une bande de papier. Photographie publiée dans "La Télégraphie Sans Fil", 1914, par le géophysicien français Alphonse Berget (1860-1934).
Date
Source
Photograph published in 'La Telegraphie Sans Fil' (Wireless Telegraphy, 1914), by the French geophysicist Alphonse Berget (1860-1934)
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Image title
Coherer radiotelegraphy receiver designed by the French inventor Auguste Jean-Baptiste Tauleigne (1870-1926) around 1914.
Radiotelegraph_receiver_from_1914.jpg