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  • 13.174 What is tangent error?—When a laterally recorded disc record is recorded, the cutting head is carried across the face of the recording disc at right angles to the direction of the disc motion. However, when reproduced, the pickup is never at right angles to the direction of motion, except at one point, because the pickup arm is pivoted in such a manner that it swings across the face of the disc in an arc.”

    Audio Cyclopedia by Howard M. Tremaine, Howard W. Sams & Co., 1969, pg.677

    February 4, 2010