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 94
llelsto A B; connect these points C, D, E, witli the focus F, and bisect byperpendicuhirs the linos F C, F D, F E. Tlie intersections of these per-pciidlciilars \s\\\\ \\w ])arjillcls will give points in the curve CDE^ throughwhicli trace tlie jiarabola. Id Method (iig. 1()C;).—Place a straight… … Fig. 166. the straight edge, holding the cord taut against the edge of the square bya pencil D, and it will describe the curve. Pkob. LXIII.—To construct cc parabola token the vertex A, the axis A B,and a point M of the curve are gwen (fig. 167). Construct the rectangle A B M C; divide M C into any…
