Search Results for: Radio broadcast receivers with sound recording
(august , – june , ) was an american inventor , self-described "father of radio", and a pioneer in the development of sound-on-film recording used for motion pictures. he had over patents, but also a tumultuous career—he boasted that he made, then lost, four fortunes. he was also involved in several
. their original design consisted of a mirror in which a narrow, moistened slit had been cut through the silvered back. attaching a battery and telephone receiver, they could hear sound changes in response to radio signal impulses. de forest, along with ed smythe, a co-worker who provided financial and...
https://en.wikipedia.org/wiki/Lee_de_Forest