Basic Description of A Telegraph
A telegraph is a device for transmitting and receiving messages over long distances, i.e., for telegraphy. An electrical telegraph uses electrical current and magnetism to convert the manual typing of codes that represent words, into electrical impulses. These impulses are transmitted over a metallic circuit (overhead wires or underground cables) to a distant location. At the distant location the impulses are converted into magnetic fields that operate a mechanical device to make a sound or to move a visual indicator. The operator at the receiving end converts these sounds or signals into a written message. The code is known as Morse Code.
Read more about this topic: History Of Telegraphy In Australia
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