Image: QuadraDisk
Size of this preview: 624 × 599 pixels. Other resolutions: 250 × 240 pixels | 1,321 × 1,269 pixels.
Original image (1,321 × 1,269 pixels, file size: 1.15 MB, MIME type: image/jpeg)
Description: An RCA QuadraDisc recording. The color fringes around the reflections are caused by the ultrasonic signal that carries the difference information used to separate the four channels.
Title: QuadraDisk
Credit: Own work
Author: Bob DuHamel
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes
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