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 226
to set off upon the verticalD E (fig. 3), above and below the point C, the radius of the pitch-circle,whoso horizontal diameter ij being at ij (fig. 4) is j^rojccted to ij (fig. 3);and thus having obtained the major and minor axes, the ellipse in questionmay easily be constructed. Tlie intersection… … PLAT E X X ITS
