A text-book of geometrical drawing, for the use of mechanics and schools, in which the definitions and rules of geometry are familiarly explained .. (1850)
Minifie, William, 1805-1880. [from old catalog] · Baltimore, W. Minifie & co. · leaf 103
rix of the parabola.2nd. The axis is the line /. H, passing through the focus, and perpendicular to the base C. D.3rd. The principal vertex, is the point J, where the top of the axis meets the curve.4th. The parameter, is a line passing through the focus, parallel to the base, terminated at each…
