Page:Elementary Color (IA gri c00033125012656167).djvu/42

 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 Fig. 3. 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.

Many of the experiments of the color wheel can be produced with a small toy called a Color Top, which is shown in Fig. 4. It is composed of a thick cardboard disk forming the body of the top and a central wooden spindle on which the disk closely fits. A number of colored paper disks are provided with this top so that very many of the experiments performed before a class can be repeated individually by the pupils and in this way the facts which may have been

demonstrated to the class with the color wheel can be fixed in the minds of the pupils by their own experiments with the top. Also as a home toy in the hands of the pupils it can be of value, not only to the children, but to the parents as well.

Fig. 5 shows the method of joining two Maxwell disks and Fig. 6 their appearance when properly joined to be placed on the rotating spindle of the color wheel. In joining two or more disks for use on a color wheel or top, care should be taken to