Smart, Edward Howard · London : Macmillian and Co. · leaf 148
inverse of V with respect to the circle, centre O.Through V and this point describe a circle having its centreon the vanishing line. (This cuts the circle, centre O, ortho-gonally.) Join O to the points R, R, where this circle cutsthe vanishing line. Join R and R to the points where these 120… … Fig. 61. line between them subtends a right angle at V. They there-fore project into conjugate lines for the conic at right angles,which, as proved in § 13, are the axes. We get the axes thenby joining to C the points where TR, TR meet the axis ofprojection. Examples on Chapter VIII. DRAWING…
Geometry, Projective
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