enthusiast used a Silvatone home recording outfit, which indented a signal-modulated groove into a bare aluminium disc and was intended for recording sound, to capture the video signal from an actual BBC 30-line 12.5 frames per second live broadcast. The known surviving disc preserves about four minutes of video without the corresponding audio. It has been digitally restored and reveals a high level of production values which belies the conventional wisdom that all mechanical television programming was very simple and static and offered little entertainment value. References External links World's Earliest Television Recordings - Restored! Television technology