The hydraulic telegraph was a semaphore system invented in the 4th century BC by Aeneas Tacticus; according to Polybius, it was used during the First Punic War to send messages between Sicily and Carthage.
The hydraulic telegraph was an optical semaphore system invented in the 4th century BC by Aeneas Tacticus. According to Polybius, it was used during the First Punic War to send messages between Sicily and Carthage.