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<a href="http://www.tpub.com/math1/19b.htm">http://www.tpub.com/math1/19b.htm</a> <br /> <br /><br /> <br />Using the outside groove as the circumference (and not the outside of the record) as it's the grooves you want to center. <br /> <br /><br /> <br />If you have a straight edge (unmarked ruler) and a compass, it is easy <br /> <br />to locate the center of a circle. Draw any line L through the circle, <br /> <br />so it intersects the circle at A and B. Then with the compass, find <br /> <br />the perpendicular bisector of AB, which will intersect the circle at C <br /> <br />and D. Clearly, CD is a diameter, so if you bisect CD at point O, O is <br /> <br />the center of the circle. <br /> <br /><br /> <br />K.
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