Analytic geometry, for technical schools and colleges (1897)
Lambert, Preston Albert, 1862-1925 · New York, Macmillan · leaf 141
reely fromthe directrix of the parabola to the start-ing point. If the body is projected from anypoint of the parabola along the tangentto the parabola at that point, and with a velocity equal to the velocity ofthe body projected from A wlien it reaches that point, the path of thebody is the path… … Art. 65. — The Elliptic Compass Let i^ -f -^ = 1 aud 3l + -^^ = 1 1)0, two ellipses ccmstructedon the same major diameter.- Let ?/, and ?/. be ordinates cor-respondintr to the same abscissa, then ■— = ^^; that is, if ellipses riiOPEIiTIES OF THE CONIC SECTIONS 127 are constructed on the same major…
Geometry, Analytic
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