An introduction to projective geometry and its applications; an analytic and synthetic treatment (1905)
Emch, Arnold, b. 1871 · New York, J. Wiley & sons; London, Chapman & Hall, limited · leaf 157
Fig. 56. these distances in a number of equal parts and numbering themfrom ab and Q, the lines joining equal numbers are tangents ofthe required parabola. To find the point of tangency of /,replace ab by c, de by /, / by ab, and the infinite tangent by de, … de being the infinite point of the axis of the parabola. For thisarrangement P is also the Brianchon point, and the constructionshows at once that the required point of tangency T is cut out bya line through P parallel to the axis of the parabola. THEORY OF CONICS. *45 To sum up, we have the…
Geometry, Projective · Geometry, Analytic
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