Brief History of Radio

It is expected that nearly all households in the United States have at least one radio. The invention of radio was dependent upon two previous discoveries: the electromagnet and telegraph.

The electromagnet was discovered in 1825. This discovery has opened the doors to global communication! Five years later, Joseph Henry successfully transmitted an electric current through the wire that was stretched over a mile and which caused an electromagnet to activate the sound of a bell. Thus, the electric telegraph was born. One of the most recognizable names associated with the telegraph, Samuel Morse, who is most notable for the number of dots (short) and hyphens (more sustained sound) which was used to transmit messages alphabetical code (and known as Morse code) . Telegraph became the only means of rapid long-distance until 1877 and the invention of the telephone.

The batteries are interesting, don `t they? Used by consumers in general are small, but highly contingent instruments that produce the electricity used for many cameras, clocks, radios and other devices. What makes this production of energy as possible? In the case of the phone `s and preliminary design and use, the cells produced the essential source of power for the electromagnet.

Batteries have two ends of which is assigned a "+" or positive, and the other a "-" or negative. When a battery of the device is switched on, electrons are produced by the cells, quickly jump on the negative side on the positive side of the battery. Something was necessary to interrupt the flow of fast electrons or find the batteries fully after a short period of time. To do this, a wire is often inserted between the positive and negative terminals and a payload, such as radio, creating a small magnetic field in the wire. Electromagnetic waves that are present today, have the ability to transmit sound (voice, music, etc.) and detected by visual images seen through the air.

There are many scientists, who must be listed as essential for the cell phone as he is known for most of us. Mahlon Loomis developed wireless telegraphy. Guglielmo Marconi, proved the possibility of radio communication. In 1985, Marconi sent and received radio signal. Using Morse code, sent the first wireless signal that was transmitted through the channel and time, he was able to receive the letter S Morse, which began in England and reached Newfoundland Newfoundland, which was the beginning Transatlantic telegraphy (1902).

Gained widespread use wireless signals as means of communication for rescue work in case of accident or disaster at sea. In 1899, the U.S. military began using wireless communication, which came from a lighthouse off Fire Island. The U. S. Navy was about two years behind the army with wireless telegraphy.

In 1903, President Roosevelt (Theodore) and King Edward VII sent through this new technology and improvement. The well-known Robert Perry, using the telegraph, sent the message that he had found "the pile".

The AM radio first came into the world of telecommunications in the 1900 `s. This device uses a bit 'vague low potential for communication. This was when the term "radio" as we know it today, the radio began to be used.

It is believed that in the December 23, 1900, Professor Reginald Aubrey Fessenden was the first person to successfully transmit the human voice using radio waves. In 1915 the word was first sent through the first the United States in New York and sent to San Francisco. A little 'later, the transmission has occurred through the Atlantic Ocean from Arlington, Virginia, in Paris the Eiffel Tower.

It's really fascinating and all scientific theories of physics that led to the invention of radio. Marconi, Alexander Popov, Oliver Lodge, Fessenden and many others have made significant contributions to an invention that has made the world so different, probably none of them are thinking. The radio was born.

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