USA HISTORY

Detailed explanation-1: -A telegraph is a communication system that sends information by making and breaking an electrical connection. It is most associated with sending electrical current pulses along a wire with Morse code encoding.

Detailed explanation-2: -A brief historical overview: The printing press was the big innovation in communications until the telegraph was developed. Printing remained the key format for mass messages for years afterward, but the telegraph allowed instant communication over vast distances for the first time in human history.

Detailed explanation-3: -There are four primary types of telegraph machines: optical telegraphs, electrical telegraphs, Morse telegraphs, and wireless telegraphs. Eventually, transcontinental telegraph lines were established for worldwide communication, too.

Detailed explanation-4: -To transmit messages across telegraph wires, in the 1830s Morse and Vail created what came to be known as Morse code.