A voyage in space; a course of six lectures "adapted to a juvenile auditory" delivered at the Royal Institution at Xmas 1913 (1915)
Turner, Herbert Hall, 1861-1930 · London Society for Promoting Christian Knowledge · leaf 56
which does not go round and come backagain, but goes on for ever. I can show you how tomake a parabola, which is just as easy as to make anellipse, I think almost easier. Take two straightlines, and set off on each a series of equal distances—let us say inches, or half inches, or whatever you… … DRAWING A PARABOLA (FIG.G.) by threads, which shape out a parabola. You neednot stop at the point 8; you can go on past it, pro-vided the lines are suitably extended, and there isno stopping-place : so you see a parabola is a curvethat goes on without end. That is important toremember : for suppose…
Astronomy -- Juvenile literature
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
