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 89
68 GEOMETRICAL PEOBLEMS. right line a distance equal to half the snm of the sides of the polygon.Tliis distance will be the base of the equivalent triangle, and the radius ofthe inscribed circle its perpendicular or altitude. PEOBLEMS ON THE ELLIPSE, THE PAUABOLA, THE HTPEEBOLA, THE CYCLOID, A:ND… … C draw the pei-pendicular D E, making C D and C E each equal to halfthe conjugate diameter. On D as a centre, with C A as radius, describearcs cutting at F, F^, for the foci. Divide A C into a number of parts atthe points 1, 2, 3, &c. With radius A 1 on F and F^ as centres, describearcs; and…
