Phototelegraphic apparatus

The phototelegraphic apparatus , of its inventor Edouard Belin, competitor of the teleautographs of the captain François Joseph Fulcrand, German Arthur Korn; of the Belgian H. Carbonelle, is the ancestor of the Télécopie ur. The name of " bélinographe" is still used for the Fax with the Canada.

This invention, presented in 1907 allows the remote control of text, document, and especially of Photographie; it will be very much used by the Reporter S of press until in the years 1960-1970.

It is a question of transmitting the information on a telegraphic line , telephone, then in 1920 on a connection radio. The document is placed on a mobile Cylindre ; it is analyzed Ligne by line, by a Electric eye which moves on the generator of the drum in Rotation; the levels of gray are transformed into Fréquence S (acute E for the white, serious for the black) and transmitted on line; at the other end a system synchronized, with an identical cylinder in a Darkroom, and a small bulb which marks a photographic paper, makes it possible to restore the document.

The sending of a photograph black and white of 13x18 cm lasts approximately 12 mn.

Later:

the document of reception is returned on thermal Papier , about the years 1960, then plain paper on simple a Imprimante;
the electric eye was replaced by a Scanner flat.
the Digitalization and the compression of the signals appreciably increased the speed and the quality of the transmission.

The telecopier had been born.

Random links: