A Brief History Of The Radio
A Brief History Of The Radio
It is expected that almost all households in the United States have at least one radio. The invention of the radio depends on 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 is stretched over one miles and an electromagnet to cause the ringing of a bell to activate. Thus the electric telegraph was born. One of the most recognizable names in connection with the telegraph is Samuel Morse, who is most notable for the number of points (short) and dashes (more sustained sound), which was used to send messages in alphabetical code (and known as Morse Code). Telegraph was the only way to get long distances to 1877 and the invention of the telephone.
The batteries are interesting, don `t you? Used by consumers in general are small, but powerful tools that packaged produce the electricity used for many cameras, clocks, radios and other devices. What makes this production of energy possible? In the case of the phone and it `s preliminary design and use, the cells that have the essential source of power for the electromagnet.
Batteries have two ends, indicated with a “+” or positive, and the other one “-” or negative. When a battery operated device is switched on, electrons are produced by cells, quickly jump on the negative side to the positive side of the battery. Something was necessary to interrupt the flow of fast electrons or find the batteries are fully spent a short time. To do this, a wire is often inserted between the positive and negative terminals and a “cargo” such as radio, creating a small magnetic field in the wire. Electromagnetic waves that are present today, have the ability to sound (speech, music, etc. transmit) and visual images detected by sight through the air.
There are many scientists who should be listed as essential to the phone as he is known to 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, he is the first wireless signal broadcast in the English Channel and sent on time, he was able to Morse letter S, which began in England and reached Newfoundland Newfoundland received, which was the beginning of the transatlantic telegraph (1902).
Wireless signals gained extensive use as a communication tool for rescue work in case of an accident or disaster occurred at sea. In 1899, the U.S. military began using the wireless communication that came out of a Fire Island lighthouse. The U. S. Navy was about two years behind the army by wireless telegraphy.
In 1903, President Roosevelt (Theodore) and King Edward VII sent via this new technology and improvement. The famous Robert Perry, by telegraph, conveyed the message that he had found “the pile”.
The first AM radio in the world of telecommunications in the 1900 `s. This device uses a somewhat vague low potential for communication. That was the word “radio” as we know it today on the radio began to be used.
It is believed that in December 23, 1900, Professor Reginald Aubrey Fessenden was the first to successfully transmit the human voice via radio waves. In 1915 the word was first sent through the beginning of the United States in New York City and sent to San Francisco. Moments later, the transmission is via the Atlantic Ocean from Arlington, Virginia, on the Eiffel Tower in Paris.
It is really fascinating and all scientific theories of physics that led to the invention of the radio. Marconi, Alexander Popov, Oliver Lodge, Fessenden and many others all have an important contribution to an invention that the world so different, probably none of them are considering. The radio era was born.
