Appleton's cyclopædia of drawing, designed as a textbook for the mechanic, architect, engineer, and surveyor (1866)
Worthen, William Ezra, 1819-1897, [from old catalog] ed, Appleton, firm, publishers, New York. (1866. D. Appleton & co.) [from old catalog] · New York, D. Appleton and company · leaf 95
ew radii, taking care that thesecond shall exceed the first by the same difference as before, and two newpoints will be determined ; and this determination of points in the curvemay thus be continued till its track is obvious. By making use of thesame radii, but transposing, that is, describing… … Fig. 168. Fig. 169. The curve may be described mechanically (fig. 169).—By fixing a rulerto one focus F, so that it may be turned round on this point, connect theextremity of the ruler E to the other focus F by a cord shorter than thewliolc hlio-lh V \X of the ruler by the given difference ; then a…
