The
displacement of the arm on the plane of the disk, the tip of the needle
describes a circumference by rotating about its vertical axis so that
the vertical projection on the disk to the axis of the needle forms a
certain angle (reading error). This angle is not constant and varies according to the distance of the needle to the center of the disk.
The difference in position between the original recording stylus and
the reproductive needle is translated into a distortion directly
proportional to the reading error and inversely proportional to the
radius of the point in question. The designers went to great lengths trying to minimize this distortion with a careful calculation of the dimensions of the arm; For a given distance between the axis of the vertical axis of the arm,
there is an arm geometry (arm length and head angle) that cause the
distortion to reach a minimum value along the arm travel. A well-designed arm should have the values of the maxima and minima of equal absolute value for the distortion.
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