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 93
radii (fig. 164). On the transverse axis A B,draw the rectangle B G, equal in height to 0 C, half the conjugate axis.Draw G D pei-pendicular to A C ; set off O K equal to O C, and on A Kas a diameter, describe the semicircle A 1^ K; draw a radius parallel toO C, intersecting the semicircle at N and… … I) Fig. 164. intersect this arc at a and h. The points H, a, D, h, W, are the centres ofthe arcs required; produce the lines a H, D a, T) h, h H^, and the spacesenclosed determine the lengths of each arc. Tliis process works well for nearly all proportions of ellipses. It isemployed in striking out…
