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Updated: May 10, 2025
Then, in close succession, we find in the solar light obscure calorific rays, the existence of which could admit of being established only with the thermometer, and which may be completely separated from luminous rays by the aid of the prism; we discover, by the aid of terrestrial bodies, that the emission of caloric rays, and consequently the cooling of those bodies, is considerably retarded by the polish of the surfaces; that the colour, the nature, and the thickness of the outer coating of these same surfaces, exercise also a manifest influence upon their emissive power.
It followed that they were regions of increased heat regions, in fact, where the temperature was too high to permit the occurrence of the precipitations to which the photosphere is due. Their obscurity was attributed, as in Dr. Brester's more recent Théorie du Soleil, to deficiency of emissive power. Yet here the verdict of the spectroscope is adverse and irreversible.
The repetition of the emissive force does not jar the gun, and the metal of our alloy does not show a strain although the gauge induces a pressure of fifty thousand pounds per square inch if it were accumulated." "And the injection valve?" "It works as easily by pressure on the disc, which replaces the trigger, perfectly." "That was your idea."
Between these two extreme positions, how does the diminution of the emissive power operate? Leslie first sought the solution of this important question.
The obscurations in question were found to be produced by no deficiency of emissive power, but by an increase of absorptive action. The background of variegated light remains unchanged, but more of it is stopped by the interposition of a dense mass of relatively cool vapours.
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