Fig. 13.
Fig. 13 is the moulding, or form known in architecture as the "echinus," or quarter-round. First draw the line a c, then b b at the proper distance; next mark with the eye the point b on the line b b, to which the curve from a joins; then put in the curve a b with one sweep. The curved portion of the moulding in Fig. 14, known as the "ogee," must be put in at one stroke of the pencil or chalk, previously drawing the top and bottom lines.
Fig. 14.
Fig. 15 is the "scotia;" it is formed geometrically by two portions of a circle, but the pupil should draw the curve at once with the hand. It is rather a difficult one to draw correctly, but practice will soon overcome the difficulty.
Fig. 15.
Fig. 16 is termed the "cyma recta;" it affords an exemplification of the line of beauty given in Fig. 11.
Fig. 16.