Spanton, J. Humphrey (John Humphrey) · London, Macmillan and Co., Limited; New York, The Macmillan Company · leaf 135
tes,also called the equiangularspiral, because the angle thecurve makes with the radiusvector is constant. The curvealso bears a constant proportionto the length of the radiusvector Take any line AC for theradius vector, and bisect it in D(Fig. 238). With D as centre,and radius DA, draw the… … GEOMETRICAL DRAWING AND DESIGN. BFC. Make the angle BCF equal to the angle ACB, and pro-duce the line till it meets the semicircle in F. Join BF. Thetriangle BFC is then similar to the triangle ABC. By repeatingthis construction we obtain a succession of similar trianglesradiating from a common…
Geometrical drawing · Design · Drawing
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
