Smart, Edward Howard · London : Macmillian and Co. · leaf 146
asymptotes can be drawn in at once, for they are theparallels to VX^, VY^ through the points where the tangents atX, and Yj meet the axis of projection. Ex. 1. Construct the angle of inclination of the plane to the horizon,so that the section may be a parabola, and draw the section in this case.… … Pig. 59. the plane of the figure, we might employ the construction of§ 13 to obtain the axes. This furnishes an independent checkupon the accuracy of the previous work, as of course theymust bisect the angles between the asymptotes (when suchexist). GENERAL FEATURES OF CONICS 119 In the…
Geometry, Projective
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