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.