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The apparatus made use of in this investigation consists of the following parts :— 1. A copper cube C, containing water kept constantly boiling, and one of whose faces, coated with lampblack, forms the source of radiant heat. 2. A brass tube 2·4 inches in diameter, which is divided into two portions, α and β.

proceedings of the royal society of london

The Bakerian lecture—On the absorption and radiation of heat by gases and vapours, and on the physical connexion of radiation, absorption, and conduction