black with the pure color. Much later it will be possible for him to think of a broken color as a tint thrown into a shade or shadow, as may be observed by casting a strong shade or shadow on to a piece of colored paper in some one of the tints of the spectrum scales.
The color wheel and tops furnish the simplest and most effective means for the presentation of broken colors, because they automatically analyze every color shown, so that the pupil sees for himself just what has been done.
After having refreshed the minds of the class as to tints and shades and grays by a brief restatement of the conditions involved in these terms, the idea of broken colors may be shown with disks on the color wheel or top. For this experiment place on the spindle, for example, a combination of orange, white and black disks, and in front of these disks put combined orange and black disks of smaller size. Make the proportions of the larger disks, O. 15, W. 4, N. 81, and the smaller, O. 26, N. 74. In rotation the larger ring will show a dark broken orange and the inner one a dark shade of orange, and the difference in quality will be readily seen and felt. The effect is more valuable as a lesson if the tones of the two are nearly equal, although this is not necessary.
A very much lighter pair of colors is secured by using the following formulas, O. 43, W. 26, N. 31, and O. 77, W. 23.
Both these experiments may be made with the primary color wheel or color top. If the High School Color Wheel is in use so that the four rings of color can be shown at one time, the two larger rings may show two tones of broken color and the smaller rings a tint and shade of pure color.
In the use of tops two may be spun at once as near together as possible, the two broken tones on one top and the tint and shade on another.
In green similar experiments may be tried, with the following formulas:—
