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Telegraph is a long-distance transmission of written messages without physical transport of letters. This was used before the telephone because it was cheaper.
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The telegraph, the telephone, and the phonograph, were all invented by Thomas Edison. He had the basics of all of them in his head, and one just led to another.
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The telegraph was invented in 1794. At the time it was a truly a wonderful invention, as it made communication over many miles much quicker than sending a letter.
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Guglielmo Marconi, an Italian inventor,is created with inventing wireless telegraph in 1935. Nikola Tesla started it all in 1893 when he demonstrated the principles of wireless telegraphy
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