Projective geometry for use in colleges and schools (1911)
Milne, William P. (William Proctor), 1881- · London : Macmillan · leaf 107
loci, and since the reciprocals of Loci areEnvelopes (Chap. III. Art. 4, Cor.), hence tlte degeneratecase of a conic regarded as an envelope is a couple ofpoints. 18. Example 1. To find how many conics can be drawn to touchtwo given lines and to pass through three givenpoints. The Dual Theorem is… … Fig. 37. Reciprocate the following figure : The description of the figure is, a and h are twolines whose point of intersection lies on the conic S.
Geometry, Projective
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