"Find the centre of each of those lines."
"Easy again," said the boy, as he set his compasses at 7⁄8 of an inch, and from the centre of the circle cut each of the straight lines with an arc. ([Fig. 22].)
"Draw a semicircle from each of these points with a radius of 5⁄8 of an inch."
"Easier still," quoth Harry, as he drew the semicircles. The drawing then looked like a ([Fig. 22]).
Fig. 22. Pulley design
"Now," said the teacher, "let me show you something." He made a few strokes with the compasses, and the drawing as shown at b was finished. "That is enough for to-day. The compasses are about the easiest of all instruments to use, provided you keep in mind that the pencil point needs to be sharpened to a chisel, or flat shape, the same as any other drawing pencil. The number of designs which may be made with it are simply endless, as you will learn later on."