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.