"The Bradley Paper Tablets for Primary Color Education, Selections 1, 2, 3, 4 for Complete Course." The four small envelopes are labeled in this way: "Selection No. 1, eighteen pieces from Chart of Pure Spectrum Scales, the Normal Spectrum Colors." "Selection No. 2, forty pieces from Chart of Pure Spectrum Scales, Tint No. 1 and Shades No. 1, with White, Black and Neutral Grays." "Selection No. 3, forty-two pieces comprising complete Chart of Broken Spectrum Scales and Warm, Cool and Green Grays." "Selection No. 4, thirty-six pieces from Chart of Pure Spectrum Scales, Tints No. 2 and Shades No. 2."
MATERIAL
A Glass Prism, the cost of which need not exceed a few cents, as almost any lamp or gas pendent in the form of a prism will serve the purpose. By the use of such a prism a small spectrum can be shown on the wall of any schoolroom having a sunny exposure during any part of the day. This spectrum will make plain the fact that sunlight is composed of many colors.
METHOD.
Show to the pupils the best solar spectrum that can be produced under the controlling conditions.
Call attention to the six colors, red, orange, yellow, green, blue and violet, and the order of their arrangement in the spectrum.
Present the colors separately as far as possible, selecting the best conditions available for each one.
MATERIAL.
Neutral gray or white card to cover desk top for a background.
Chart of Pure Spectrum Scales.
Colored Paper Tablets, Selection No. 1, embracing the six standards and the intermediate spectrum hues, eighteen pieces.
Color Wheel or Tops.
