Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 152
restoring the cone to its first position, intersect the line S L. It is of importance, further, to ascertain the points at which the curves ofpenetration meet theoutlines A S and S Bof the cone. The planewhich passes throughthese lines, being pro-jected horizontally inA B, will cut the spherein a… … cone. To find the lines ofj)enetration of a cylin-der and a cylindriccdring, or annular torus(Fig. 273). Let the circles A EB, F G K, representthe horizontal, and thefigure A C B D the ver-tical projection of thetorus, and let the circleH/ L, and the rectan-gle H I M L be theanalogous projections…
Mechanical drawing
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