History of the Telegraph
Telegraphy requires that the method used for encoding the message be know to both sender and receiver. And flag semaphore signal are early example. In the 19th century, the harnessing of harnessing of electricity led.
The chappes carried out experiments during the next two years, and on two occasions their apparatus at place de i'Etoile, Paris was destroyed by mobs who thought they were communicating with royalist forces. However, in the summer of 1792 claude was appoined ingeniur telegraphiste and charged with establishing a line of station between Paris and Lille, a distance of 230 kilometres (about 143 miles). It was used to carry dispatches for the war between France and Austria. In 1794, it brought news.