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**QUADRATRIX**(from Lat.- The
**quadratrix**of Dinostratus was well known to the ancient Greek geometers, and is mentioned by Proclus, who ascribes the invention of the curve to a contemporary of Socrates, probably Hippias of Elis. - Then the locus of the intersection of PQ and OM is the
**quadratrix**of Dinostratus. - The
**quadratrix**of Tschirnhausen is constructed by dividing the arc and radius of a quadrant in the same number of equal parts as before. - The mutual intersections of the lines drawn from the points of division of the arc parallel to AB, and the lines drawn parallel to BC through the points of division of AB, are points on the
**quadratrix**(fig.

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