unchanged, and this can only be thecase if this radiation from the polished face bears to theradiation from the blackened face the same ratio as theabsorption of the polished face bears to that of the blackenedface. Ritchie in his experiments used, instead of the two plates,two metal vessels, fig.… … Fig. 80, 202 HEAT. [CH. XII figure is fitted with a scale to determine its position betweenthe bulbs. 167. The Reflection of Radiation. We have seenthat radiant energy is reflected from a surface on which it isincident. The proportion however which the amount of radia-tion reflected bears to the…
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