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Dwau I : Dwau Marcel Munoz Manuel Orellana 2013 : Free Download & Streaming : Internet Archive
Technical change was afoot. During World War I, radio technology was greatly accelerated in part by military sponsorship. By the end of the war, the vacuum tube was commercially available for use in low-cost radios as well as radio transmitters and all sorts of other devices.
History of Phonograph Record Technology- "Electrically" Recorded Discs
Talking Motion Pictures
Talking Motion Pictures "The advent of American talking movies is beyond comparison the fastest and most amazing revolution the whole history of industrial revolutions." -- Fortune Magazine, October, 1930KDKA, First Commercial Radio Station - GHN: IEEE Global History Network
From GHN From Guglielmo Marconi’s earliest successful radio demonstrations, which consisted of point-to-point sending of telegraph signals in Morse Code , it was clear to many that radio should be a broadcast medium. That is, rather than two people using it to talk back and forth like a telephone, one person could send out a signal that could be heard by many, like an actor speaking lines in a big auditorium.
Sept. 29, 1920: Radio Goes Commercial
1920: The Joseph Horne department store in Pittsburgh advertises ready-made radio receivers that can pick up a local broadcast station. Commercial radio is just weeks away. Frank Conrad was assistant chief engineer of the Westinghouse Electric Company in Pittsburgh.
A Science Odyssey: People and Discoveries: KDKA begins to broadcast
KDKA begins to broadcast 1920 Photo: Beginnings of KDKA, with entire staff of four
Valdemar Poulsen (23 de noviembre de 1869 - 23 de julio de 1942) fue un inventor dinamarqués , más conocido por haber inventado el telegráfono , la primera máquina capaz de grabar sonido, de forma magnetica.
Valdemar Poulsen