Radiation at Different Temperatures

Abstract

BOALFOUR STEWART states in his “Elementary Treatise on Heat” that “Newton was the first to enunciate his views on the cooling of bodies. He supposed that a heated body exposed to a certain cooling cause would lose at each instant a quantity of heat proportionate to the excess of its temperature above that of the surrounding air.” In order to prove the fallacy of Newton's supposition, Prof. Stewart presents the following extract frjm the work of MM. Dulong and Petit:—