Excerpt from The Laws of Radiation and Absorption: Memoirs by Prévost, Stewart, Kirchhoff, and Kirchhoff and BunsenThe attempt of Prévost to explain the experiments of Pictet, of the apparent concentration of cold at the focus of a mirror, without attributing the quality of radiation to cold, as assumed by Pictet, lead him to the enunciation of the very important principle which he called the movable equilibrium of heat, now designated as the ...
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