Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 181
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… … Fig. 158 may be assumed at random. VIII, § 1481 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 tliecone, the plan of which…
Geometry, Descriptive
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