Some problems pertaining to ruled surfaces of the 3rd order

Abstract

If through any point on a quadratic cylinder we draw a secant plane (defining a conoprima k), a tangent plane, and in it some skew line d) (not in the plane of the curve k) and not a generator of the cylinder), and then from each point of this line draw two rays in the diametral plane of the cylinder through the points of the curve k), we obtain a ruled surface of the third order.

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