Practical plane and solid geometry for advanced students, including graphic statics, adapted to the requirements of the South Kensington syllabus (1899)
Harrison, Joseph, Baxandall, George Albert · London Macmillan · leaf 114
the parabola, for AF= AZ. A is calledthe vertex, and the perpendicular ZF the axis of the para-bola. The latter is a line of symmetry for the curve. To draw the curve. Select a series of points 1, 2, 3 . . .on the axis as shown, and through these points draw linesperpendicular to the axis. With Fas… … ioo PRACTICAL PLANE GEOMETRY chap. 100. Properties of the parabola.—In the upper figurePN and PM are perpendicular to the axis and directrix.PT is the tangent and PG the normal at P, and A Y is thetangent at the vertex. PN is called the ordinate, and NGthe subnormal for the point P. The double…
