How many types of telegraph are there?

Answer 1

There are several types of telegraphs, but the main categories include the electrical telegraph, which uses electrical signals to transmit messages over wires, and the optical telegraph, which relies on visual signals, such as semaphore or flag signaling. Within these categories, there are various systems and technologies, such as the Morse Code telegraph and the telephone telegraph. Each type has its own specific applications and historical significance in communication.