Guglielmo Marconi, a young Italian engineer, first transmitted a radio signal in his home in 1895. Radio developed rapidly as people began to comprehend the tremendous possibilities. The stations KDKA in Pittsburgh and WWWJ in Detroit began broadcasting in 1920. Within 10 years, there were radio stations in all the major cities in the United States, and broadcasting had become a big business. The National Broadcasting Company became the first network in 1926 when it linked together 25 stations across the country. The Columbia Broadcasting System was organized in the following year. In 1934, the Mutual Broadcasting Company was founded. The years between 1930 and 1950 may be considered the zenith years of the radio industry. With the coming of television, radio broadcasting took second place in importance as entertainment for the home—but radio's commercial and communications value should not be underestimated.
Discoveries that led to the development of television can be traced as far back as 1878, when William Crookes invented a tube that produced the cathode ray. Other inventors who contributed to the development of television were Vladimir Zworykin, a Russian-born scientist who came to this country at the age of 20 and is credited with inventing the iconoscope before he was 30; Charles Jenkins, who invented a scanning disk, using vacuum tubes and photoelectric cells; and Philo Farnsworth, who invented an image dissector. WNBT and WCBW, the first commercially licensed television stations, went on the air in 1941 in New York. Both suspended operations during World War II but resumed them in 1946 when television sets began to be manufactured on a commercial scale.
As radio broadcasting was growing across the country in its early days, the need for announcers grew. They identified the station and brought continuity to broadcasts by linking one program with the next as well as participating in many programs. In the early days (and even today in smaller stations) announcers performed a variety of jobs around the station. When television began, many radio announcers and newscasters started to work in the new medium, and the jobs and job skills have evolved over the years. Television news broadcasting requires specialized on-camera personnel—anchors, television news reporters, broadcast news analysts, consumer reporters, and sports reporters (sportscasters).
In addition to being broadcast via transmitters, radio and television stations now also broadcast via satellite technology and on the Internet.
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