The telephoto is a remote transmission system, by wire or radio, of still images by means of electrical signals that allow their reproduction (printing) at the end of a communication line.
The most common use of the telephoto is the remote reproduction of documents, drawings, correspondence, printed matter.
Insights
With the telephoto, the image to be transmitted is scanned with a photocell. The electrical impulses obtained from it are then transmitted remotely, where they drive the intensity of a light beam. The beam is then projected onto a sheet of photosensitive paper of suitable size.
The main use consists in the remote duplication of documents. Therefore, given the modest bandwidth necessary for this, the transmission takes place on a normal telephone line, which is often of the "point-to-point" type. Thus, the line is used exclusively for the automatic reproduction of a high volume of handwritten and printed documents. The transmitted image is called a belinogram.
Today the telephoto has been totally supplanted by digital images transmitted through the Internet.
Technical Data Sheet
• Manufacturer: Edouard Belin
• Place: France
• Sistema: Ancestor of the Fax
• Colore: black
