19th Century Telegraph Key / Manipulateur télégraphique du 19ième siècle

(Le français suit l'anglais)

Early forms of long-distance communication were based primarily on sending codes and symbols using visual indicators. Examples of this include smoke signals and semaphore towers. The discovery of electricity made it possible to transmit messages along electrical lines. This spurred considerable research, culminating in the invention of the electric telegraph. The electric telegraph was more versatile and reliable than visual indicators. It also provided instantan