Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 191
. The idea is the same in either case.III. Cylinders. The same construction will suffice forcylinders if it is kept in mind that a cylinder may be consideredas a cone with its apex at an infinite distance. 154. To Pass a Plane Tangent to a Cone (or a Cylinder)through a Point Outside. Every tangent… … FiQ. 168 VIII, § 155] CURVED SURFACES 175 If the cone rests on H, the H trace of the required plane willbe tangent to the base of the cone. Two tangent planes maybe passed through any point outside the surface. If the base of the cone does not rest on II, an auxiliary planeparallel to H, and…
Geometry, Descriptive
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