. A device used to transmit and receive signals over long distances.
. Name is originated from Greek letters:
Tele : far
graphein : writings
. Invented by American Samuel F.B. Morse in 1836.
. Message sent through it is called telegram.
. Person who operates is called Telegrapher.
. Morse code is used to send message, which is also invented by Samuel Morse.
. First message was sent in 1884 using Telegraph.
Working:
. Morse Code is used to send data which has dots and dashes to represent characters.
. It worked by pushing operator key down to complete the electric circuit.
. This action sends the electric signals across a wire to receiver at other end.
. All it requires is wire, line of poles between station and receiver and battery.
. Operators will be able to hear and understand code just by listening to clicking of receiver.
. They translate code into English.
Impact of Telegraph:
. Before invention of Telegraph, people used handwritten, horseback methods to send messages to longer distances.
. It was the first device that can send messages electronically.
. After invention of Morse and Telegraph, it became the fastest mode of long distant communication.
. It laid groundwork for all later inventions like telephone, fax machine, internet.
Rise and Decline:
. During World War II, telegraph system was extensively used with troops and leaders to communicate.
. Post offices also used telegraph system as way to receive and deliver messages.
. All the long distant communication was depended upon telegraph until 1870's.
. In 1877, Telephone was invented and changed the way people communicate.
. By the invention of telephone, need for telegraphs began to decline and phased out.
. Later in 1895, Guglielmo Marconi invented Wireless Telegraph which transmits signals using radio waves.
. Later in 1895, Guglielmo Marconi invented Wireless Telegraph which transmits signals using radio waves.
