Telegraph dating service
Possible messages were fixed and predetermined and such systems are thus not true telegraphs.The earliest true telegraph put into widespread use was the optical telegraph of Claude Chappe, invented in the late eighteenth century.Thus flag semaphore is a method of telegraphy, whereas pigeon post is not.
Contrary to the extensive definition used by Chappe, Morse argued that the term telegraph can strictly be applied only to systems that transmit and record messages at a distance.
The few remaining telegraph applications were largely taken over by alternatives on the internet towards the end of the twentieth century.
The word "telegraph" (from Ancient Greek: τῆλε, têle, "at a distance" and γράφειν, gráphein, "to write") was first coined by the French inventor of the Semaphore telegraph, Claude Chappe, who also coined the word "semaphore".
The electric telegraph was slower to develop in France due to the established optical telegraph system, but an electrical telegraph was put into use with a code compatible with the Chappe optical telegraph.
The Morse system was adopted as the international standard in 1865, using a modified Morse code developed in Germany.
The heliograph is a telegraph system using reflected sunlight for signalling.