A Ruled Surface is a normal developable of a curve if can be parameterized by , where N is the Normal Vector.
See also Binormal Developable, Tangent Developable
References
Gray, A. ``Developables.'' §17.6 in Modern Differential Geometry of Curves and Surfaces.
Boca Raton, FL: CRC Press, pp. 352-354, 1993.