t heat, and be reflected. How? Sothat the reflected beam will lie as the heat willbe lodged within the ice. But the temperature much on the left of this index, a }, which is perpendicular to of ice cannot be raised beyond 32° Fahrenheit without the ice the mirror, as the direct beam lies upon the… … ice. It will liquefy the ice internally, and I want you to see which the elder boyg ought to remember. This angle, g, it is radiating its heat as a lumiuous body radiates light the wonder andthe beauty involved in this beautiful sub- made between the perpendicular, a 0 (Fig. 5), and the line, ¢ a,…
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