Electric telegraph

An Electric telegraph is a telegraph that uses electric signals, uisually conveyed via a dedicated telecommunication circuit or bi radio. The electric telegraph, or mair commonly juist telegraph, superseded optical semaphore telegraph seestems, sicweys acomin the first form o electrical telecommunications. In a matter o decades efter thair creation in the 1830s, electric telegraph networks permitted fowk an commerce tae transmit messages across continents an oceans awmaist instantly, wi widespread social an economic impacts.

Single needle telegraph instrument