The essentials of descriptive geometry . Fig. 92. Fig. 93. and the other X. In given problems the data are usually givenwhich determine which point is intended, otherwise two solutionsto such problems are possible. In Fig. 93 a similar problem is shown. In this case the planview of the point is assumed and its elevation located at one ofthe points x or y, depending on which side of the cone the pointis to be taken. loi. Proposition 26. Given the axis of a cone, the size andlocation of its right section to find the plan and elevation of thecone. • Discussion. If the cone be revolved parallel to
The essentials of descriptive geometry . Fig. 92. Fig. 93. and the other X. In given problems the data are usually givenwhich determine which point is intended, otherwise two solutionsto such problems are possible. In Fig. 93 a similar problem is shown. In this case the planview of the point is assumed and its elevation located at one ofthe points x or y, depending on which side of the cone the pointis to be taken. loi. Proposition 26. Given the axis of a cone, the size andlocation of its right section to find the plan and elevation of thecone. • Discussion. If the cone be revolved parallel to a plane ofprojection, the given right section may be drawn in its givenlocation. If, then, elements be drawn through this section from CONICAL SURFACES 117 the apex the base of the cone in H or V may be found by findingwhere the elements pierce H or V. Construction. In Fig. 94, OQ is the given axis, and P thegiven point on this axis where it pierces the given right right section in this construction is taken as a circle w
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