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
parabola are known; they are parallel tothe extreme lines of the force polygon. Designate in Fig. S7the tangents at the extremities by ab and de, and the infinitetangent by c. Then the Brianchon points P are situated on ad,and hues through P parallel to ab and de (the tangents at theextremities)… … 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,
Geometry, Projective · Geometry, Analytic
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