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 133
into the drawing-board at thepoints 7^ and F\ and the string is looped around these pegsin the manner indicated in the figure. The two parts of thestring are grasped in one hand at H and drawn away from F.The pencil P will then describe an arc of an hyperbola withfoci at F and F\ for the two… … 126 ANALYTIC GEOMETRY. ence remains constant. The otlier l^ranch may be generatedin the same manner by placing the pencil F at some
Geometry, Analytic -- Plane
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