Spanton, J. Humphrey (John Humphrey) · London, Macmillan and Co., Limited; New York, The Macmillan Company · leaf 128
rom O draw OK parallelto AB till it meets a linefrom H parallel to AC in the point K (Prob. 3). This will beone point in the curve, and others may be found by taking freshpoints on CD and treating them in a similar manner. One peculiar property of this figure is that, if we take anypoint in the… … 165. A mechanical method of drawing- a parabola or hyperbola.Let AB represent the edge of a drawing-board and CD the edge of a tee-square. Takea piece of string equal inlength to CD, fix one end atD and the other at E, whichis the focus of the curve. Ifa pencil be held against thestring so as to…
Geometrical drawing · Design · Drawing
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
