Search Results for: Sound recording apparatus operated by banknotes
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( ) lee de forest (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
the loud sound of the spark. [ ] still, he was intrigued by the idea that, properly configured, it might be possible to use a flame or something similar to detect radio signals. after determining that an open flame was too susceptible to ambient air currents, de forest investigated whether ionized gases...
https://en.wikipedia.org/wiki/Lee_de_Forest