In the foregoing pages an attempt is made to explain clearly and as briefly as possible the principles on which the Bradley system of color instruction is based, and also to suggest a few definitions necessary to an intelligent discussion of the general subject of Color. Owing to the peculiar nature of the questions involved, demonstration by actual experiment is more convincing than the mere statement of theories can possibly be, and therefore a few of the following pages will be devoted to the explanation of some valuable experiments, all of which may be tried by the teacher in private, while many of them can be shown the pupils with great advantage.
In this system the Maxwell color disks are the means for color combinations and the basis for measurements, and therefore for a color nomenclature. For this reason the present chapter treats largely of the proper use of the wheel and incidentally the theory of red, yellow and blue primaries with combinations to produce secondaries and tertiaries. No teacher using the material connected with this color scheme can hope to meet with success without a knowledge of the principles on which it is based, and in this subject as in all others, it is essential that the teacher shall know much more of it than he or she is ever required to teach.
The Color Wheel.
Fig. 3.
For most convenient use the machine should be clamped to the front of a table and near one end, so that the speaker using it can stand at the end of the table and operate it with the right hand. Fig. 2 represents the Normal School Color Wheel showing the face of the disks as seen by the audience. Facility in the operation of the Color Wheel is rapidly acquired by practice and the exact position is easily determined by the operator after a few trials.
Fig. 3 shows the Primary School Color Wheel, which has only two sizes of disks, while the largest machine has four sizes and is much finer in construction. The smaller machine does not require clamping to a table, but may be steadied by the left hand while being operated by the right hand.
The Color Top.
Fig. 4.
