THE BUZZER
This toy is made from 1/4" stock. Two 1/8" holes are located on a straight line passing thru the center, one on each side of the center and 1/4" from it. The circle is drawn with compass, and then sawed to the line.
The circumference is stepped off into lengths equal to the radius, and every second point connected by line with the center. This divides the surface into three equal spaces called sectors. Color each sector with one of the primary colors—red, blue and yellow.
A strong cord is slipped thru the two holes, and the ends tied together in a square knot, leaving a loop on each side of the wheel.
To operate the buzzer, insert a finger of each hand in the loops and swing the disk around in a circular motion till the strands of the cord are twisted together. Then pull hard on the cord so that the disk will be set into a spinning motion as the cord is being unwound. At this instant slacken the cord so that the disk may continue turning, and rewind the string. Then pull on the cord again, and the disk will spin in the opposite direction. By whirling the disks rapidly in this way, the colors will blend and show a new color produced by the three primary colors. The other side of the wheel may have half of it colored yellow and half colored blue. This will blend into green when spun. By pasting paper sectors of different colors on the wheel, an infinite number of tests in color-blending may be made.
THE SHARK PUZZLE
The shark is sawed out as shown in the drawing and three holes bored.
To make one of the rings, draw two concentric circles—one 1/2" radius and the other 3/4" radius. First, saw out the inner circle and then the outer.