Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 179
eestablished by § 29, and a plane can be passed perpendicularto this line at one end by § 82. This establishes the base plane,axis, and apex. The given base curve can then be drawn onthe plane by counter-rabattement. (See §§95 and 128.)Finally, the elements of sight may be drawn through the apexand… … may be assumed at random. VIII, § 148] CURVED SURFACES 163 the V projection of the base and above c*, as c. This pointtogether with o determines the V projection of the element oc.It should be noted that oC is also the V projection of an ele-ment on the back of thecone, the plan of which isshown at…
Geometry, Descriptive
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