Capacitance Electronic Disc
To read the disc, a titanium needle was placed very lightly on the outer edge of the disc. A small electric current was then passed through the center of the needle, where it would touch the bottom of the groove and read the audio information, which was stored in small holes. The needle would read these by detecting how much air was between the needle and the pit and then the electronics of the player would convert these into audio. The visual information was stored in the grooves and were read like a regular phonograph record. As the needle passed over the grooves, it would vibrate and the player would convert the vibrations into the pictures.