radioBetween 1923 and 1930, 60 percent of American families had purchased radios. Radio ownership as well as radio stations majorly increased throughout the United States in the 20's. By 1922, there were 600 radio stations around the United States. Crystal radios were the first radios used, and in the 20's manufacturers worked hard to improve them. While manufacturers did this, Edwin Armstrong worked to implement the vacuum tube on the radio, and in 1924 the first vacuum tube radio was introduced to the market. The radios around the 20's were battery operated, and as soon as they moved to battery powered radios, the popularity of the radio went up majorly. In the late 1920's, radio advertising was introduced. In 1926 the Federal Radio Commission was set up, and the Radio Act of 1927 organized the Federal Radio Commission.
|
television1920- John Logie Baird patented the idea of using arrays of transparent rods to transmit images for television. His 30 line images were the first demonstrations of television by reflected light.
1923- Charles Jenkins invented a mechanical television system called radiovision and claimed to have transmitted the earliest moving silhouette images. 1927- Philo Farnsworth transmitted a television with 60 horizontal lines. The image transmitted was a dollar sign. 1929- Russian inventor, Vladimir Zworykin invented an improved cathode-ray tube called the kinescope. Zworykin was one of the first to demonstrate a television system with all the features of modern picture tubes. |