Aldis, W. Steadman (William Steadman), 1839-1928 · Cambridge [Eng.] Deighton, Bell, and co.; London, G. Bell and sons · leaf 59
axis of the moving parabola in 31, and draw QH and MNparallel to the axis of y. Then from the parabola PQ, P3P = z = r. QM, and from the parabola QO, QH = f = 1. OH =lx-l. QM . / ^_ OF THE SECOND ORDER. 49 40. The Hyperbolic Paraboloid. This is generated in the same manner as the last sur-face… … P any point in it. Draw P3I parallel to O2, MN and QHparallel to Oy. Let I and I be the latera recta of the twoparabolas OQ, PQ. From the parabola PQ, PM = z = V . QM, I rom the parabola OQ, QH^=^f = l.OH = l.{x + QM) — ox -{• J, , • J. rp I l~ The two paraboloids are both included in the equation…
