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 338
mid-point c. The lines corresponding to cb^ thus obtainedwill be ordinates of the elliptic trace, and may be set off oneach side of vav on the projectors from the respectivepoints in aa(. This method is useful when the cone is sosituated that its trace is a parabola or hyperbola; or anellipse so…
