William W. Coblentz

William W. Coblentz (born Nov. 20, 1873, North Lima, Ohio, U.S.—died Sept. 15, 1962, Washington, D.C.) was an American physicist and astronomer whose work lay primarily in infrared spectroscopy. Coblentz developed more accurate infrared spectrometers and extended their measurements to longer wavelengths. In 1905 he published a lengthy study of the infrared emission and absorption spectra of numerous elements and compounds. In 1914–16 he published improved values for the Stefan-Boltzmann constant of blackbody radiation and...