he given curve may begenerated in an infinity of ways by the unrolling of a stringwound round a curve traced on that developable. Let MM\MM\ &c. denote the successive elements of the curve, K^ K\&c. the middle points of these elements, then the planes drawnthrough the points K perpendicular… … XJ) hence tangents to the cuspidal edge B8 of that surface. Drawnow at pleasuref any line KB in the first normal plane,meeting the first generator in i>; join BK^ which being inthe second normal plane will meet the second generator AB\say in B\ In like manner, let KB meet AB in B\ Weget thus a…
Geometry, Analytic · Surfaces
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