The science of beauty, as developed in nature and applied in art (1856)
Hay, D. R. (David Ramsay), 1798-1866 · Edinburgh London, W. Blackwood and sons · leaf 70
esent the length of the intendedellipse. Through B draw B e indefinitely, at right angles withABC; through C draw the line Gf indefinitely, making, withB C, an angle of (J). Take B C upon the compasses, and place the point of oneleg upon D where Gf intersects B e, and the point of theother upon the… … The foci being in either case thus simply ascertained, themethod of describing the curve on a small scale is equallysimple. A pin is fixed into each of the two foci, and another intothe point D. Around these three pins a waxed thread,flexible but not elastic, is tied, care being taken that the…
