The Solar Spectrum.
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.