During Antiquity the transmission
of visible signals had been imagined. The Greeks (4th century
before J.C) and the Romans on lathes used torches and smoke in
order to send messages according to definite codes. Only during
the 18th century appears the telegraph, thanks to the Chappe
brothers. Consequently, search of improvement continuing to improve
the transmission of information. Thus, the optical telegraph
was replaced by the electric telegraph.
Discover the evolution of the
transmission of information. Click on the image of the telegraph
of your choice.