The elements of plane analytic geometry. A text-book including numerous examples and applications, and especially designed for beginners (1903)
Briggs, George R. (George Russell), b. 1853, Bôcher, Maxime, 1867-1918 · New York, J. Wiley & sons; [etc., etc.] · leaf 129
, may be deter-mined with more precision by plotting a number of points, or bythe following method based on the definition of the curve. Let the extremities of a flexible string, whose length is 2a, befixed at the foci, F and F; let F, the point of a pencil, move inthe plane, keeping the string… … 122 ANALYTIC GEOMETRY. The co?ijugate, or minor, axis is that part of the perpendicularto the major axis, through the centre, which is included by thecurve ; it is shown in the figure as B^ B. The student has probably noticed that a, the half-sum of thefocal radii, is equal to the semi-major axis…
Geometry, Analytic -- Plane
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