Tangi-cal to the rail at h (Fig. 173) draw h k parallel to da; then ka2 will be the joint between the twist and the other part of the scroll. Make de2 equal to the stretch-out of de, and upon d e2 find the position of the point k, as at k2; at Fig. 174, make e d equal to e2 d in Fig. 173, and d c equal to d c2 in that figure; from c draw c a at right angles to e c, and equal to one rise; make c b equal to one tread, and from b, through a, draw b j; bisect a c in l, and through l draw m q parallel to e h; m q is the height of the level part of a scroll, which should always be about 3 1/2 feet from the floor; ease off the angle m f j, according to Art. 521, and draw gwn parallel tow x j, and. at a distance equal to the thickness of the rail; at a convenient place for the joint, as i, draw in at right angles to bj; through n draw j h at right angles to e h; make dk equal to dk2 in Fig. 173, and from k draw ko at right angles to eh; at Fig. 173, make dh2 equal to d h in Fig. 174, and draw h2 b2 at right angles to d h2;
then k a2 and h2 b2 will be the position of the joints on the plan, and, at Fig. 174, op and in their position on the falling-mould; and po in (Fig. 174) will be the required falling-mould which is to be bent upon the vertical surface from h2 to k (Fig. 173).