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 92
Pkob. LXI.—To describe an ellipse approximately^ hy means of circular arcs. First, with arcs of two radii (fig. 163). Take tlie difference of the trans-verse and conjugate axes, and set it off from the centre O to <^ and (?, onO A and O C ; draw a c^ and set off half a do d; draw d i parallel to… … set off 0 ^ equal to O cZ, join e i, and draw e m, dm, parallels to d i, i e. Oncentre m, with radius m C, describe an arc thiough C, and from centre idescribe an arc through D; on centre d, <?, also, describe arcs through Aand B. The four arcs thus described form approximately an ellipse.…
