| This article talks about some of the scientists and | | | | of us. Mahlon Loomis created wireless telegraph. |
| the physics that led to the invention of the radio. | | | | Guglielmo Marconi, proved the possibility of radio |
| The world was never the same. The radio era was | | | | communication. In 1985 Marconi, transmitted and |
| born. | | | | received a radio signal. Using the Morse alphabet, he |
| It is expect that nearly every household in the United | | | | sent the first wireless signal which was transmitted |
| States has at least one radio. The invention of the | | | | across the English Channel and in due time, he was |
| radio was dependent upon two previous discoveries: | | | | able to receive the Morse letter S which began in |
| the electromagnet and telegraph. | | | | England and reached Newfoundland which became |
| The electromagnet was discovered in 1825. This | | | | the beginning of transatlantic radiotelegraphy (1902). |
| discovery opened the doors to global communication! | | | | Wireless signals gained far reaching use as a means |
| Five years later, Joseph Henry successfully | | | | of communication for rescue work when an accident |
| transmitted an electric current via wire which was | | | | or disaster occurred at sea. In 1899 the United |
| stretched over a mile and which caused an | | | | States Army began utilize wireless communication |
| electromagnet to trigger the sounding of a bell. Thus, | | | | which originated from a lightship off Fire Island. The |
| the electric telegraph was born. One of the most | | | | US Navy was about two years behind the Army in |
| recognizable names associated with the telegraph is | | | | utilizing wireless telegraphy. |
| Samuel Morse who is most notable for the series of | | | | In 1903, President Roosevelt (Theodore) and King |
| dots (brief sound) and dashes (more sustained | | | | Edward VII communicated via this new and improving |
| sound) which was used to transmit messages by | | | | technology. The well known Robert Perry, using |
| alphabet code (thus known as Morse Code). | | | | radiotelegraphy, conveyed the message that he had |
| Telegraph became the sole means of rapid long | | | | `found the Pole`. |
| distance communication until 1877 and the invention | | | | The first AM radio entered the world of |
| of the telephone. | | | | telecommunication in the early 1900`s. This device |
| Batteries are interesting, aren`t they? Used by the | | | | made the use of somewhat weak waves possible |
| general consumer, they are small, but powerfully | | | | for communication. This was the time when the term |
| packed instruments which produce power used for | | | | `radio`, as we know today for radio devices, began |
| many cameras, alarm clocks, radios, and other | | | | to be used. |
| devices. What makes this power production possible? | | | | It is believed that in December 23, 1900, professor |
| In the case of the telephone and it`s early design and | | | | Reginald Aubrey Fessenden was the first person to |
| use, batteries produced the essential source of | | | | successfully transmit human voice by radio waves. By |
| power for the electromagnet. | | | | 1915, speech was first sent across the United States |
| Batteries have two ends to which one is assigned a | | | | beginning in New York City and sent to San Francisco. |
| `+` or positive, and the other a `-` or negative. When | | | | Somewhat later, transmission occurred across the |
| a battery operated device is switched on, the | | | | Atlantic Ocean from Arlington, Virginia, to Paris at the |
| electrons which are produced by the batteries, | | | | Eiffel Tower. |
| quickly move from the negative side to the positive | | | | It is truly fascinating all the scientists and the physics |
| side of the batteries. Something was needed to | | | | theories that led to the invention of the radio. |
| interrupt this rapid flow of electrons or find the | | | | Marconi, Alexander Popov, Oliver Lodge, Fessenden |
| batteries totally expended in a brief time. In order to | | | | and many others, have all made important |
| accomplish this, a wire is often inserted between the | | | | contributions to an invention that made the world so |
| positive and negative terminals and a `load`, such as a | | | | different, that most likely none of them would |
| radio, creating a small magnetic field in the wire. The | | | | envision. The radio era was born. |
| electromagnetic waves which are present now, have | | | | This article is under GNU FDL license and can be |
| the capability to transmit sounds (speech, music, and | | | | distributed without any previous authorization from |
| so on) as well as visual images undetected by sight | | | | the author. However the author's name and all the |
| through the air. | | | | URLs (links) mentioned in the article and biography |
| There are several scientists who must be mentioned | | | | must be kept. |
| as essential to the telephone as it is known to most | | | | |